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   A 57


    Anhydrous tin and lead hexacyanoferrates (II)/ Part 1. Synthesis and crystal structure [] / V. G. Zubkov, A. P. Tyutyunnik, I. F. Berger, L. G. Maksimova, T. A. Denisova, E. V. Polyakov // Solid State Sciences. - 2001. - V. 3, N 3. - С. 361-367 . - ISSN 1293-2558

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОЛОВО -- СВИНЕЦ -- Pb -- Sn -- Fe -- ЖЕЛЕЗО -- ГЕКСАЦИАНОФЕРРАТЫ -- СИНТЕЗ -- КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- АТОМЫ -- НЕЙТРОННАЯ ДИФРАКЦИЯ -- ДИФРАКЦИЯ НЕЙТРОННАЯ -- ПОРОШКОВАЯ ДИФРАКЦИЯ -- ДИФРАКЦИЯ ПОРОШКОВАЯ
Аннотация: The crystal structure of Pb2Fe(CN)6 has been first determined and refined using the Rietveld method with combined Cu---Kalpha1 X-ray and constant-wavelength neutron powder difraction data in space group P-3 (147, Z = 1). The unit cell constants are a = 7.1346(1) and 7.1805(1) A, c = 5.4531(2) and 5.3639(1) A, respectively. The compounds are layered, groups of three nearest [Fe(CN)6](4-)-complexes are joined to layers by means of Pb or Sn atoms. The same Pb or Sn atoms (c.n. = 3+3) joint three nearest complexes from the next layer. The jointing goes through 'nitrogen---lead(tin)---nitrogen' bonds

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   L 79

    Lipatnikov, V. N.
    Atomic–Vacancy Ordering in the arbide Phase zeta--Ta4C3 –x [Text] / V. N. Lipatnikov, A. I. Gusev // Physics of the Solid State. - 2006. - Vol. 48, № 9. - P1634-1645. - Bibliogr. : p. 1645 (30 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ТАНТАЛА -- НЕСТЕХИОМЕТРИЯ -- АТОМНО-ВАКАНСИОННОЕ УПОРЯДОЧЕНИЕ
Аннотация: The structure of the nonstoichiometric trigonal (rhombohedral) carbide zeta--Ta4C3 –x forming in the tantalum–carbon system is studied by neutron diffraction, x-ray diffraction, and metallography. The unit cell parameters of the trigonal (space group ) carbide zeta-Ta4C3 –x(TaC0.67) are found to be ah= 0.3123 nm and ch= 3.0053 nm. It is shown that the metallic close-packed sublattice of the zeta-Ta4C3 –x phase consists of alternating blocks in which the metallic atoms are arranged in the same manner as on the fcc sublattice of the cubic carbide TaCy and the hcp sublattice of the hexagonal carbide Ta2C, respectively, and that the former sublattice is intermediate between the latter two sublattices. We are the first to establish experimentally that the distribution of carbon atoms and structural vacancies in the zeta-Ta4C3 – x carbide is ordered and to calculate the istribution function of carbon atoms over the nonmetallic-sublattice sites involved in the ordering. The results obtained for the zeta-Ta4C3 – x phase are used to refine the phase diagram of the Ta–C system

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   B 39


    Behavior of materials based on tin dioxide in molten cryolite-oxyfluoride [] / B. B. Gushchin, G. D. Milova, G. V. Bazuev, V. A. Lebedev // Melts. - 1992. - March. - С. 486-490. - Bibliogr.: 13 ref.

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТОЙКОСТЬ КОРРОЗИОННАЯ -- КОРРОЗИОННАЯ СТОЙКОСТЬ -- ДИОКСИД ОЛОВА -- КРИОЛИТЫ -- ОКСИФЛЮОРИДЫ -- ЭЛЕКТРОДЫ -- АЛЮМИНИЙ -- Al -- Sn -- ОЛОВО -- РАСПЛАВЫ -- ЭЛЕКТРОХИМИЧЕСКИЕ СВОЙСТВА -- СВОЙСТВА ЭЛЕКТРОХИМИЧЕСКИЕ
Аннотация: The corrosion resistance and electrochemical behavior of material based on tin dioxide in molten cryolite-oxyfluoride are investigated. SnO2-based electrodes are used to measure the emf of the electrochemical concentration cell

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   C 51


    Chemical interactions in the cathode half-cell of lithium-ion batteries [Текст] / O. V. Bushkova, O. L. Andreev, N. N. Batalov, S. N. Shkerin, M. V. Kuznetsov, A. P. Tyutyunnik, O. V. Koryakova, E. H. Song, H. J. Chung // Journal of Power Sources. - 2006. - Vol. 157, № 1. - С. 477-482

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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   C 91


    Crystal Structure and Spectroscopic Properties A[VO2(SO4)(H2O)2] · H2O (A = K, Rb, Tl, NH4) Compounds / V. G. Zubkov, A. P. Tyutyunnik, I. F. Berger, V. N. Krasil'nikov, L. A. Perelyaeva, I. V. Baklanova // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 9. - P1415-1423 : il. - Bibliogr. : p. 1422-1423 (18 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУЛЬФАТ ВАНАДИЯ -- СПЕКТРОСКОПИЯ
Аннотация: The crystal structure of dioxovanadium(V) sulfate trihydrates A[VO2(SO4)(H2O)2] · H2O, where A is K, Rb, Tl, or NH4, has been determined based on a combination of neutron and X-ray diffraction data. The compounds are isostructural and have a monoclinic lattice (space group P21, Z = 2) with unit cell parameters ‡ = 6.24535(8), 6.26016(7), 6.25817(5), and 6.2500(1) Å; b = 9.8417(1), 9.99736(8), 9.96217(9), and 9.9742(1) Å; c = 6.52113(8), 6.69303(5), 6.70379(6), and 6.70334(9) Å; β = 106.99(1)°, 107.83(1)°, and 107.83(1)°, 107.99(1)°, respectively. The SO4 tetrahedra and VO4(H2O)2 octahedra share an oxygen vertex to form infinite isolated chains. Atoms A have CN = 10. IR and Raman spectroscopy data are reported

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   C 91


    Crystal Structure and Spectroscopic Properties of AVO2SO4 (A = K, Rb) Compounds / A. P. Tyutyunnik, V. G. Zubkov, I. F. Berger, V. N. Krasil'nikov, L. A. Perelyaeva, I. V. Baklanova // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 9. - P1424-1429 : il. - Bibliogr. : p. 1429 (20 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ВАНАДАТЫ
Аннотация: The crystal structure of alkali-metal dioxovanadium(V) sulfates AVO2SO4, where A is K or Rb, has been determined based on a combination of neutron and X-ray diffraction data. The compounds are isostructural and have an orthorhombic lattice (space group P212121, Z = 4) with unit cell parameters a = 11.1004(2) and 10.8193(1) Å; b = 8.2626(2) and 8.9042(1) Å; c = 5.4772(1) and 5.5722(1) Å, respectively. The structures are of the chain type. Zigzag chains are formed by vertex-sharing VO6 octahedra. Sulfate groups SO4 link neighboring chains and form a spatial framework with cavities accommodating alkali-metal atoms with CN = 9 (K) and 8 (Rb). IR and Raman spectroscopy data are reported

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   C 91


    Crystal Structure of -beta'-Zn2V2O7 / T. I. Krasnenko, V. G. Zubkov, A. P. Tyutyunnik, L. V. Zolotukhina, E. F. Vasyutinskaya // Crystallography Reports. - 2003. - Vol. 48, № 1. - P. 35-38 : il. - Bibliogr. : p. 38 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПИРОВАНАДАТ ЦИНКА -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ
Аннотация: The crystal structure of the high-temperature modification of zinc pyrovanadate, namely, beta'-Zn2V2O7, is refined by the full-profile Rietveld method (GSAS) using the high-temperature X-ray diffraction data. The crystals are monoclinic (space group C2/m, Z = 2); the unit cell parameters are as follows: a =6.9324(2) Å, b = 8.4394(2) Å, c = 5.0326(1) Å, and b = 108.272(2)°. Comparative analysis of the crystal structures of b'-Zn2V2O7, b-Mn2V2O7, and Cd2V2O7 is performed

\\\\Expert2\\nbo\\Crystallography Reports (Кристаллография)\\2003, v.48, N 1, p.35-38.pdf
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   C 91


    Crystal structure of the low-temperature form of K3PO4 [Text] / V. I. Voronin [et al.] // Inorganic Materials. - 2006. - Vol. 42, № 8. - P908-913 : il. - Библиогр. : с. 912-913 (15 назв.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОРТОФОСФАТ КАЛИЯ -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- МЕТОД РИТВЕЛЬДА
Аннотация: The crystal structure of the low-temperature form of K3PO4 has been determined for the first time using neutron diffraction (Rietveld method) and Raman spectroscopy: orthorhombic cell (sp. gr. Pnma, Z = 4), lattice parameters a = 1.12377(2) nm, b = 0.81046(1) nm, c = 0.59227(1) nm. The structure is made up of isolated [PO4] tetrahedra, with the potassium ions in between

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   C 91


    Crystal structure, morphotropic phase transition and luminescence in the new cyclosilicates Sr3R2(Si3O9)2, R=Y, Eu–Lu / A. P. Tyutyunnik, I. A. Leonidov, L. L. Surat, I. F. Berger, V. G. Zubkov // Journal of Solid State Chemistry. - 2013. - Vol. 197. - P447-455 : il. - Bibliogr. : p. 454-455 (71 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РЕНТГЕНОВСКАЯ ДИФРАКЦИЯ -- СИЛИКАТЫ -- ЛЮМИНЕСЦЕНЦИЯ
Аннотация: A new series of promising luminescent materials, cyclosilicates Sr3R2(Si3O9)2, R=Y, Eu–Lu, has been synthesized via a solid-state reaction. X-ray and neutron powder diffraction studies show that these oxides crystallize in the monoclinic crystal system (S.G. C2/c, Z=4) and have a morphotropic phase transition between Er and Tm compounds followed by a step-like change of the unit cell constants. Isolated [Si3O9] rings located in layers are basic building units and stack with Sr/R layers along the [1 0 ] direction. The rare earth atoms are distributed among three independent Sr/R sites coordinated by 8, 7 and 6 oxygen atoms, and the Sr-R populations change from mixed to 0.5/0.5 over site (1) and full occupation of sites (2) and (3) by Sr and R, respectively, at the transition. Changes of the conformation and mutual arrangement of [Si3O9] rings, as well as exchange of oxygen atoms from the first and the second coordination sphere of two Sr/R sites also feature the phase transition. Luminescence in Sr3Y2(Si3O9)2:Eu3+ under ultraviolet (UV) excitation has been discussed

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10.

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   C 91


    Crystal structures of double vanadates LiCoVO4 and Li0:5Co1:25VO4 / O. N. Leonidova, V. I. Voronin, I. A. Leonidov, R. F. Samigullina, B. V. Slobodin // Journal of Structural Chemistry. - 2003. - Vol. 44, № 2. - P243-247 : il. - Bibliogr. : p. 247 (9 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ВАНАДАТЫ -- ШПИНЕЛИ -- ЭЛЕКТРОННАЯ СТРУКТУРА -- ЛИТИЙ
Аннотация: The crystal structures of vanadates Li1-2xCo1+xVO4 with x = 0 and 0:25 have been studied by a full pattern analysis. It has been shown that in cubic spinel LiCoVO4 (space group Fd3m), the 8a tetrahedral sites contain a majority of vanadium and a small amount of lithium; all cobalt, lithium, and a small amount of vanadium occupy the 16d octahedral sites. Li0.5Co1.25VO4 crystals belong to the rhombic system (Imma space group) with unit cell parameters a = 5:939(1) A, b = 5:810(1) A, and c = 8:303(1) A. On substitution of lithium by cobalt according to the scheme 2Li+ -> Co2+ + , half of the lithium and 70% of the vacancies formed are in the 4a octahedral sites, and one-third of lithium and most of cobalt occupy the 4d octahedral sites. The 4e tetrahedral sites are completely occupied by vanadium and lithium in a ratio of 0:92=0:08. The interatomic distances in LiCoVO4 and Li0.5Co1.25VO4 are calculated, and the sizes of lithium ion transport channels are evaluated

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11.

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   C 91


    Crystal Structures of La1-xSr2+x(GeO4)(V1-xMoxO4) (x=0-0.4) Solid Solutions / V. D. Zhuravlev, V. G. Zubkov, A. P. Tyutyunnik, Yu. A. Velikodnyi, N. D. Koryakin // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 1. - P134-136 : il. - Bibliogr. : p. 136 (11 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОРТОВАНАДАТ ЛАНТАНА -- ТВЕРДЫЕ РАСТВОРЫ
Аннотация: The phase compositions of theLaVO4–SrMoO4(1) and Sr2GeO4–SrMoO4(2) binary systems, which bound the Sr2GeO4–LaVO4–SrMoO4(3) ternary system, and the LaSr2(VO4)(GeO4)– Sr2GeO4+SrMoO4 section (4) of system 3 are studied at subsolidus temperatures. Systems 1 and 2 consist of a mixture of the initial compounds, and the La1 –xSr2 + x(GeO4)(V1 – xMoxO4) (where 0 ≤ x ≤ 0.4) region of substitutional solid solutions with a palmierite structure is formed in system 3. The unit cell parameters of the solid solutions are determined. The distribution of the lanthanum and strontium cations over two positions of the cationic sublattice is described

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12.

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   E 27


    Effect of Electronic State of Ions on the Electrochemical Properties of Layered Cathode Materials LiNi1-2xCoxMnxO2 / N. V. Kosova, E. T. Devyatkina, V. V. Kaichev, D. G. Kellerman // Russian Journal of Electrochemistry. - 2008. - Vol. 44, № 5. - P543-549. - Bibliogr. : p. 548-549 (31 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СЛОИСТЫЕ КАТОДНЫЕ МАТЕРИАЛЫ -- ЛИТИЕВО-ИОННЫЕ БАТАРЕИ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ
Аннотация: The cathode materials of the composition LiNi1– 2xCoxMnxO2(x= 0.1, 0.2. 0.33) synthesized from the Ni, Co, Mn mixed hydroxides and LiOH by using mechanical activation method are studied. It is shown that all synthesized compounds have layered structure described by the space group R-3m. With the decreasing of the nickel content the cell volume and the degree of structure disordering decrease. According to XPS data, the electronic main state of d-ions at the prepared samples' surfaces corresponds to Ni2+,Co3+, and Mn4+. Anincrease in the nickel content leads to the increase of the Ni2p3/2and Co2p3/2binding energy, which points to the change in the Me–O bond covalence. According to magnetic susceptibility measurements data, the nickel ions in LiNi0.6Co0.2Mn2O 2 exist in the two oxidation states: Ni2+and Ni3+. It is shown that this sample has the highest specific discharge capacity (~170 mAh/g). The positions of redox peaks in the differential capacitance curves depend on the sample composition: with the increasing of nickel content they are shifted toward lower voltages

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13.

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   E 43


    Electronic structure and chemical bonding of delta-Bi203 / N. I. Medvedeva, V. P. Zhukov, D. L. Novikov, V. A. Gubanov // Journal of Structural Chemistry. - 1996. - Vol. 37, № 1. - P41-50 : il. - Bibliogr. : p. 49-50 (21 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВИСМУТА -- ФЛЮОРИТОПОДОБНАЯ СТРУКТУРА -- ЛМТО МЕТОД
Аннотация: The band structure of the fluorite-type 6-Bi203 was calculated by the linear LMTO methods in the approximation of overlapping atomic spheres using the basis set of orthogonal orbitals (LMTO-ASA) and by the full-potential LMTO method (LMTO-FP) for two vacancy orientations over a wide range of oxygen concentrations. The calculated parameters of chemical bonds - the binding energy Ebin and the pressure of the electron-nuclear system - show that the most stable compound is that with two vacancies per unit cell, oriented predominantly along the (111) direction. The hybrid Bi-O bonds are weak, and mostly the Bi-Bi bonds are responsible for the structural stabilization of c5-Bi203 . The mechanism of the formation of a semiconductor gap in the band structure of 6-Bi203 is discussed

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14.

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   E 43


    Electronic Structure and Magnetic States of Crystalline and Fullerene-Like Forms of Nickel Dichloride NiCl2 / A. N. Enyashin, N. I. Medvedeva, Yu. E. Medvedeva, A. L. Ivanovskii // Physics of the Solid State. - 2005. - Vol. 47, № 3. - P527-530 : il. - Bibliogr. : p. 530 (12 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИХЛОРИД НИКЕЛЯ -- ФУЛЛЕРЕНЫ -- ФЕРРОМАГНЕТИКИ -- СТЕХИОМЕТРИЯ
Аннотация: The electronic structure and magnetic properties of the crystalline and fullerene-like forms of nickel dichloride NiC² are investigated in the framework of the local spin density functional theory. It is demonstrated that the band gap can be reproduced in the energy band spectrum of the NiCl² compound with inclusion of the magnetic ordering in the calculation of the band structure. The metamagnetic nature of the NiCl² dichloride (i.e., the transition from an antiferromagnetic phase to a ferromagnetic phase in a weak magnetic field) is explained in terms of a small difference (0.025 eV/cell) between the total energies of the ferromagnetic and antiferromagnetic phases. Polyhedral three-shell nanoparticles of the NiCl² compound exhibit magnetic properties (the magnetic moment of nickel lies in the range 2.0–2.3 µβ). For isostructural nanoparticles of the FeCl² dichloride, the magnetic moment of iron is larger and falls in the range 4.2–4.5 µβ, whereas nanoparticles of the CdCl² dichloride are found to be nonmagnetic. The results of analyzing the interatomic interactions indicate that the composition of fullerene-like nanoparticles of the dichlorides under investigation can deviate from the 1 : 2 stoichiometric composition

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15.

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   S 53

    Shein, I. R.
    First principle prediction of vacancy-induced magnetism in non-magneticperovskite SrTiO3 / I. R. Shein, A. L. Ivanovskii // Physics Letters A. - 2007. - Vol. 371. - P. 155-159 : il. - Bibliogr. : p. 159 (32 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ВАКАНСИИ РЕШЕТОК -- СТРУКТУРА ЭЛЕКТРОННАЯ -- МАГНЕТИЗМ -- ПЕРОВСКИТЫ -- SrTiO3
Аннотация: A theoretical study of magnetization in non-magnetic cubic perovskite SrTiO3 induced by vacancies in Sr, Ti and oxygen sublattices is presented using the full-potential linear augmented plane wave (FP-LAPW) method within the generalized gradient approximation (GGA) for the exchange correlation potential. The results show that the oxygen and titanium vacancies lead to the magnetization of non-magnetic perovskite SrTiO3 due to the spin-polarization of valence states for the Ti and O atoms, nearest to these vacancies. In result the insulating SrTiO3 becomes metallic-like with magnetic moments (per cell) 1.30 мB and 3.54 мB for non-stoichiometric SrTiO3.д and SrTi1-deltaO, respectively. On the contrary, our calculations reveal that for Sr vacancy the non-magnetic state of perovskite is retained, whereas the electronic spectrum of Sr1-deltaTiO3 also adopts metallic-like type

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16.

Инвентарный номер: нет.

   S 53

    Shein, I. R.
    Influence of lattice vacancies on the structural, electronic, and cohesive properties of niobium and molybdenum borides from first-principles calculations [Text] / I. R. Shein, A. L. Ivanovskii // Physical Review B: Condensed Matter and Materials Physics. - 2006. - Vol. 73, № 14. - P144108/1-144108/9. - Библиогр. : с. 144108/8 (55 назв.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
БОРИД МОЛИБДЕНА -- БОРИД НИОБИЯ -- ПЕРВОПРИНЦИПНЫЕ РАСЧЕТЫ
Аннотация: The influence of lattice vacancies on the structural, cohesive, and electronic properties of Nb and Mo borides were examined by means of the full-potential linearized augmented plane wave method and the generalized gradient approximation. The structural parameters, densities of states (DOS), charge distribution, heats of formations, and vacancy formation energies for metal-deficient hexagonal Nb1−xB2, Mo1−xB2 as well as for boron-deficient rhombohedral Mo2B5−y were obtained and compared with those for complete hexagonal NbB2, MoB2 and rhombohedral Mo2B5. We show that the presence of metal vacancies in hexagonal phases leads to (i) the decreasing of in-plane parameter a but increasing the interplane cell parameter c; (ii) well pronounced changes of near-Fermi DOS and the appearance of the novel vacancy states; and (iii) a substantial decrease in the stability of borides. On the contrary, in the case of Mo2B5 the appearance of the boron vacancies leads to enhancing of stability of a rhombohedral phase

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17.

Инвентарный номер: нет.

   H 99


    Influence of Oxygen Nonstoichiometry on the Special Properties of Solid Solutions LaNb2-2xTa2xVO9-delta (x = 0-0.4) and LaTa2-2xNb2xVO9-delta (x = 0-0.1) [] / M. G. Zuev, E. V. Arkhipova, L. A. Perelyaeva, L. V. Zolotukhina, O. B. Lapina, R. N. Pletnev // Journal of Solid State Chemistry. - 2002. - V.167, N 1. - С. 73-79 . - ISSN 0022-4596

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ТВЕРДЫЕ РАСТВОРЫ -- ОКСИДНАЯ НЕСТЕХИОМЕТРИЯ -- НЕСТЕХИОМЕТРИЯ ОКСИДНАЯ -- ЭПР -- ЭЛЕКТРОННЫЙ ПАРАМАГНИТНЫЙ РЕЗОНАНС -- ЯМР -- ЯДЕРНЫЙ МАГНИТНЫЙ РЕЗОНАНС -- ИК-СПЕКТРОСКОПИЯ -- ИНФРАКРАСНАЯ СПЕКТРОСКОПИЯ -- СПЕКТРОСКОПИЯ ИНФРАКРАСНАЯ -- СПЕКТРАЛЬНЫЕ СВОЙСТВА -- СВОЙСТВА СПЕКТРАЛЬНЫЕ -- La -- Nb -- Ta -- V -- ЛАНТАН -- НИОБИЙ -- ТАНТАЛ -- ВАНАДИЙ -- СПЕКТРОСКОПИЯ КОМБИНАЦИОННОГО РАССЕЯНИЯ
Аннотация: Phase equilibria in the LaVO4-Nb2O5-Ta2O5 system were analyzed. New solid solutions LaTa2-2xNb2xVO9-delta (x = 0-0.1) and LaNb2-2xTa2xVO9-delta (x = 0-0.4) were detected in this system. The structures of the vanadate-niobate LaNb2VO9 and vanadate-tantalate LaTa2VO9 are not known. The structures of the vanadate-tantalate LaTa2VO9 and LaTa2VO9-based solid solutions are similar to the structure of LaTa7O19, which refers to the hexagonal crystal system. The influence of the oxygen nonstoichiometry delta (x) on crystallochemical characteristics and spectral properties of these solid solutions were examined by the X-ray phase analysis, IR and radio spectroscopic methods. A correlation between the nonstoichiometry delta (x) and the volume of a unit cell V(x) of solid solutions LaTa2-2xNb2xVO9-delta was found. The IR spectrum of LaTa2VO9-delta transformed in going from delta = 0 to delta # 0. Two types of VO4 tetrahedra were formed in solid solutions LaNb2-2xTa2xVO9-delta depending
on delta (x)

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18.

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   C 51

    Cherkashenko, V. M.
    Influence of pressure on the x-ray spectra and electronic structure of vanadium oxycarbide and vanadium oxynitride / V. M. Cherkashenko, E. Z. Kurmaev, Yu. G. Zainulin // Journal of Structural Chemistry. - 1988. - Vol. 29, № 2. - P311-313 : il. - Bibliogr. : p. 313 (8 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИНИТРИД ВАНАДИЯ -- ОКСИКАРБИД ВАНАДИЯ
Аннотация: Investigations of the oxides of titaniumand vanadium following treatment under the conditions of high pressures (P) and temperatures (t) [1-3] showed that such treatment results in changes in a number of structural physical characteristics (the lattice constant, the number of particles in the unit cell, and the volume of the latter) and electronic properties (the magnetic susceptibility and x-ray emission spectra)

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19.

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   H 99


    Ionic and electronic conductivity of La9.83-xPrxSi4.5Fe1.5O26 + or - delta apatites [] = Ionic and electronic conductivity of La9.83-xPrxSi4.5Fe1.5O26 + or - delta apatites / A. A. Yaremchenko, A. L. Shaula, V. V. Kharton, J. C. Waerenborgh, D. P. Rojas, M. V. Patrakeev, F. M. B. Marques // Solid State Ionics. - 2004. - V. 171, N 1-2. - С. 51-59. - Библиогр.: с. 59 (30 назв.) . - ISSN 0167-2738

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АПАТИТЫ -- ИОННАЯ ПРОВОДИМОСТЬ -- ПРОВОДИМОСТЬ ИОННАЯ -- ЧИСЛА ПЕРЕНОСА -- ЭЛЕКТРОННАЯ ПРОВОДИМОСТЬ -- ПРОВОДИМОСТЬ ЭЛЕКТРОННАЯ -- ИМПЕДАНС -- ТВЕРДЫЕ ЭЛЕКТРОЛИТЫ -- ЭЛЕКТРОЛИТЫ ТВЕРДЫЕ -- ОКСИДЫ -- МЕССБАУЭРОВСКАЯ СПЕКТРОСКОПИЯ -- СПЕКТРОСКОПИЯ МЕССБАУЭРОВСКАЯ
Аннотация: The incorporation of praseodymium in the apatite-type lattice of La9.83-xPrxSi4.5Fe1.5O26 + or - delta (x = 0-6) decreases the unit cell volume, suppresses Fe4+ formation according to Mossbauer spectroscopy, and increases p- and n-type electronic contributions to total conductivity, studied by the impedance spectroscopy and modified faradaic efficiency (FE) and electromotive force (EMF) methods at 973-1223 K. The additions of praseodymia have no essential effect on the ionic transport, with an activation energy of 99-109 kJ/mol, under oxidizing conditions. Contrary to the Al-containing analogue, La9.83Si4.5Al1.5O26, exhibiting p(O2)-independent conductivity at oxygen pressures from 10(-20) to 0.5 atm, the ionic conductivity of La9.83-xPrxSi4.5Fe1.5O26 + or - delta decreases on reducing p(O2) below 10(-14)-10(-12) atm. The observed behavior suggests a presence of hyperstoichiometric oxygen, critical for the level of ionic conduction and compensated by the formation of Fe4+ or
Pr4+. The ion transference numbers in air vary in the range 0.979-0.994 for La9.83-xPrxSi4.5Fe1.5O26+delta, whilst for La9.83Si4.5Al1.5O26 the p-type electronic contribution to the total conductivity is lower than 0.5%. The average thermal expansion coefficients (TECs) of silicate-based solid electrolytes are (8.8-9.4)x10(-6)K(-1) at 300-1200 K and (14.2-15.8)x10(-6)K(-1) at 1200-1350 K

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20.

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   V 86

    Volkov, V. L.
    Ionic Conductivity of (PbOH)2V12O31 · nH2O / V. L. Volkov, G. S. Zakharova // Inorganic Materials. - 2003. - Vol. 39, № 11. - P. 1188-1191 : il. - Bibliogr. : p. 1191 (5 ref.)

ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОННАЯ ПРОВОДИМОСТЬ -- ТЕРМООБРАБОТКА -- ПОЛИВАНАДАТЫ -- ЗОЛЬ-ГЕЛЬ МЕТОД
Аннотация: The 333-K complex impedance and temperature-dependent 10-kHz electrical conductivity of the cell Ni|(PbOH)2V12O31 · nH2O|Ni were measured. The results demonstrate that heat treatment changes the conductivity of (PbOH)2V12O31 · nH2O. After the removal of hydrate water, the activation energy for conduction in the range 203–485 K is 0.27 eV. The polarization resistance of the Ni electrodes is 31% of the total resistance of the cell at 296 K and is nearly zero above 303 K. The potential of the system lead polyvanadate/lead varies linearly with the Pb2+ concentration in aqueous Pb(NO3)2 solutions

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