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1.
Инвентарный номер: нет.
   


   
    63,65Cu NMR study of low-frequency spin dynamics in the infinite-layer antiferromagnetic compound SrCuO2 [Текст] / K. N. Mikhalev, S. O. Rebrin, A. P. Gerashenko, T. V. D'yachkova // JETP Letters (Translation of Pis'ma v Zhurnal Eksperimental'noi i Teoreticheskoi Fiziki). - 2004. - Vol. 80, № 8. - С. 540-543. - Библиогр. : с. 543 (15 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНТИФЕРРОМАГНЕТИКИ -- ЯМР -- МЕДЬ
Аннотация: The spin–lattice and spin–spin relaxation times have been measured for 63,65Cu NMR in the infinite-layer antiferromagnet SrCuO2 in the ordered state for temperatures from 4.2 to 361 K. In the region of low temperatures (T£ 250 K), both relaxation processes are of the same nature and the main contribution to the relaxation rate is associated with the diffusion of a small number of holes with an activation energy of ~42 meV. In the hightemperature range (T > 250 K), contributions to the transverse relaxation rate exhibit redistribution and this relaxation process is determined predominantly by indirect interactions

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2.
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   A 58


    Animitsa, I. E.
    Structure and Electrical Properties of Oxygen-Deficient Strontium Copper Niobate / I. E. Animitsa, E. N. Dogodaeva, E. V. Zabolotskaya // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - P254-260 : il. - Bibliogr. : p. 260 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПРОТОННЫЙ ПЕРЕНОС -- НИОБАТЫ -- СТРОНЦИЙ
Аннотация: The transport properties of Sr5.66Cu0.14Nb2.20O11.30 double perovskite, which enters the homogeneity region of (Sr1 – yCuy)6 – 2xNb2 + 2xO11 + 3x solid solution, are concerned. The total conductivity is differentiated into terms over wide ranges of temperatures and oxygen partial pressure pO2 in dry and humid atmospheres. When pO2 is low or high, a test sample has dominant electron transport of n- or p-type, respectively. In air (pO2 = 0.21 atm), the p-type electron conductivity term increases with temperature elevation. In a humid atmosphere ( pH2O= 0.02 atm), a sample is capable of a reversible incorporation of water occlusion from the gas phase; as a result, some proton conductivity term appears and ion transference numbers increase over a wide range of pO2 values

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3.
Инвентарный номер: нет.
   
   A 74


    Arkhipova, E. V.
    Subsolidus phase equilibria of in the La2O3-V2O5-Nb2O5-Ta2O5 system [] / E. V. Arkhipova, M. G. Zuev, L. V. Zolotukhina // Journal of Alloys and Compounds. - 2000. - V. 305, N 1-2. - С. 58-62. - Bibliogr.: 11 ref. . - ISSN 0925-8388
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУБСОЛИДУС -- РАВНОВЕСИЕ ФАЗОВОЕ -- ФАЗОВОЕ РАВНОВЕСИЕ -- РАСТВОРЫ ТВЕРДЫЕ -- ТВЕРДЫЕ РАСТВОРЫ -- АНАЛИЗ РЕНТГЕНОФАЗОВЫЙ -- РЕНТГЕНОФАЗОВЫЙ АНАЛИЗ -- ОКСИД ВАНАДИЯ -- ОКСИД ЛАНТАНА -- ОКСИД НИОБИЯ -- ОКСИД ТАНТАЛА -- La2O3 -- V2O5 -- Nb2O5 -- Ta2O5 -- СТРУКТУРА КРИСТАЛЛИЧЕСКАЯ -- КРИСТАЛЛИЧЕСКАЯ СТРУКТУРА -- ДИАГРАММЫ ФАЗОВЫЕ -- ФАЗОВЫЕ ДИАГРАММЫ -- СИСТЕМЫ ЧЕТВЕРНЫЕ -- ЧЕТВЕРНЫЕ СИСТЕМЫ -- ОКСИДЫ СЛОЖНЫЕ -- СЛОЖНЫЕ ОКСИДЫ -- V -- La -- Nb -- Ta -- ВАНАДИЙ -- ЛАНТАН -- НИОБИЙ -- ТАНТАЛ
Аннотация: X-ray phase analysis has been used to examine the phase composition of the La2O3-V2O5-Nb2O5-Ta2O5 system in the subsolidus region up to 1200 C. It was found that solid solutions including the M-fergusonite and webwerite structures, as well as a limited series of LaTaO4-based solid solutions, are formed in the ternary La2O3-Nb2O5-Ta2O5 system. Solid solutions based on the LaNb2VO9 and LaTa2VO9 compounds have been detected in the La2O3-V2O5-Nb2O5-Ta2O5 system. These solid solutions have been examined by IR and radio spectroscopy. The number of defects in the vanadium sublattice is found to depend on the composition and sintering conditions. Elementary tetrahedrons have been found in the La2O3-V2O5-Nb2O5-Ta2O5 system

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4.
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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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5.
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   D 26


    Davydov, D. A.
    Refinement of the V–O Phase Diagram in the Range 25–50 at % Oxygen / D. A. Davydov, A. A. Rempel // Inorganic Materials. - 2009. - Vol. 45, № 1. - P. 47-54 : il. - Bibliogr. : p. 53-54 (36 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВАНАДИЯ -- ФАЗОВЫЕ ДИАГРАММЫ
Аннотация: The boundaries of the V14O6+VxOz two-phase region in the V–O system at temperatures from ~1050 to ~1650 K have been determined experimentally. The V–O phase diagram has been refined in the range 25–50 at % oxygen using structural and microstructural data for vanadium oxides containing less than 50 at % oxygen in conjunction with earlier results. The possibility of ordering of cubic vanadium monoxide has been examined

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6.
Инвентарный номер: нет.
   
   S 98


   
    Disorder-order phase transformations and electrical resistivity of nonstoichiometric titanium carbide [Text] / V. N. Lipatnikov, L. V. Zueva, A. I. Gusev, A. Kottar // Physics of the Solid State. - 1998. - Vol. 40, № 7. - P1211-1218. - Bibliogr. : p. 1218 (30 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КАРБИД ТИТАНА -- НЕСТЕХИОМЕТРИЯ -- ФАЗОВЫЙ ПЕРЕХОД -- ЭЛЕКТРОСОПРОТИВЛЕНИЕ
Аннотация: Phase transformations of the disorder-order type in the homogeneity region of nonstoichiometric titanium carbide TiCy (0.5
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7.
Инвентарный номер: нет.
   
   E 43


   
    Electronic structure and chemical bonding in Sr4Nb17O26 / V. M. Zainullina, V. P. Zhukov, V. G. Zubkov, A. P. Tyutyunnik // Journal of Structural Chemistry. - 1998. - Vol. 39, № 5. - P627-635 : il. - Bibliogr. : p. 634-635 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСОНИОБАТ СТРОНЦИЯ -- МЕТОД ЛМТО
Аннотация: The electronic structure of oxoniobate Sr4Nb17026 is studied by the linear muffin-tin orbital (LMTO) method. It is shown that the high-energy conduction band consists of the Nb4d states and the hybridized valence band is formed by the Nb4d and 02p states. The band structure of this compound is characterized by superposition of the bands of the 2p states of perovskite oxygen atoms and the 4d states of monoxide niobium atoms. The degree of oxidation of the perovskite and monoxide niobium atoms is + 5 and + 2.56, respectively. Chemical bonding is analyzed using the electron localization function and model Hiickel calculations. The niobium-oxygen bond is shown to be the strongest. The Fermi level is localized in the vicinity of the bottom of the niobium antibonding state band, which explains the existence of Sr4-xNb17026 in the homogeneity region corresponding to 0 < x < 0.3

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8.
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   G 51


   
    Glass formation and vibrational spectra of glasses in the RSO4-Na2B4O7-K2SO4 (R = Mg, Ca, Sr, Ba) systems [Текст] / V. G. Vyatchina, L. A. Perelyaeva, M. G. Zuev, V. L. Mamoshin, I. V. Baklanova // Glass Physics and Chemistry. - 2006. - Vol. 32, № 6. - С. 634-637. - Библиогр. : с. 637 (10 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The regions of glass formation in the RSO4-Na2B4O7-K2SO4 (R = Mg, Ca, Sr, Ba) systems are determined. These regions are completely concentrated in the borate-rich region of the concentration triangle and occupy approximately 20% of the triangle area. The IR and Raman spectra of the glasses under investigation are recorded. It is revealed that the vibrational spectra of the glasses depend on the type of alkaline-earth metal cation. It is assumed that the structure of the glasses is determined by the glass-forming borate motifs with embedded sulfate anion tetrahedra.

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9.
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   G 51


   
    Glass Formation and Vibrational Spectra of Glasses in the SrSO4–KPO3–Na2B4O7 System / V. G. Vyatchina, L. A. Perelyaeva, M. G. Zuev, V. L. Mamoshin // Glass Physics and Chemistry. - 2003. - Vol. 29, № 6. - С. 522-525 : il. - Bibliogr. : p. 524-525 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТЕКЛА ФОСФАТНЫЕ -- СТЕКЛООБРАЗОВАНИЕ -- СИСТЕМЫ СУЛЬФАТОБОРАТНЫЕ
Аннотация: The glass formation region in the SrSO4–Na2B4O7–KPO3 system is determined for the first time. This region occupies 31.8% of the concentration triangle predominantly in the polyphosphate region. The boundary of the glass formation lies along the binary line connecting the sodium tetraborate and potassium metaphosphate regions and reaches compositions with 40 mol % SrSO4. Along the line connecting the potassium phosphate and sodium tetraborate regions, the glass formation at 10 mol % SrSO4 is bounded by the 0.1SrSO4–xNa2B4O7–(0.9 – x)KPO3 join (the Na2B4O7–KPO3 binary join is vitrified completely). From analyzing the IR and Raman spectra, it is assumed that the structure of the glasses under investigation is formed by lattices of two types, namely, the sulfate phosphate and borate lattices

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10.
Инвентарный номер: нет.
   
   G 96


    Gusev, A. I.
    of NonstoichiometricEffect of Carbon Vacancies on the Electric Resistivity of Nonstoichiometric VCy Vanadium Carbide / A. I. Gusev // JETP Letters. - 2009. - Vol. 90, № 3. - P191-196 : il. - Bibliogr. : p. 196 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- КАРБИД ВАНАДИЯ -- ЭЛЕКТРОСОПРОТИВЛЕНИЕ
Аннотация: The influence of the temperature, concentration, and distribution of structure vacancies of the carbon sub lattice on the electric resistivity ρ of nonstoichiometric VCy vanadium carbide (0.66 ≤ y ≤ 0.875) has been studied in the temperature range of 300–1200 K. The symmetry and structure characteristics of the ordered V6C5 and V8C7 phases formed owing to low temperature annealing on various sections of the homogeneity region of the VCy carbide. The dependence of the residual electric resistivity on the content of the disordered vanadium carbide is explained by the atom–vacancy interaction and the change in the carrier concentration in the homogeneity region of VCy

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11.
Инвентарный номер: нет.
   
   K 81


    Krasil'nikov, V. N.
    Phase Ratios in the K2O-V2O4-SO3 System at High Sulfur Trioxide Concentrations / V. N. Krasil'nikov // Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 2. - P258-262 : il. - Bibliogr. : p. 262 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИДНЫЕ СИСТЕМЫ -- ВАНАДИЕВЫЕ КАТАЛИЗАТОРЫ -- ТРИОКСИД СЕРЫ
Аннотация: Phase ratios in the three-component oxide system K2O–V2O4–SO3 in the region of the sulfur trioxide concentrations corresponding to its concentrations in the active component of vanadium catalysts for SO2 to SO3 conversion have been studied using powder X-ray diffraction, IR spectroscopy, microscopy, and chemical analysis. Four individual compounds (K2VO(SO4)2, K2(VO)2(SO4)3, K2VO(SO4)2S2O7, and K2(VO)2(SO4)2S2O7) and K2(VO)2(SO4)2S2O7 and VOSO4-base solid solutions of composition K2(VO)2 + x(SO4)2 + xS2O7 (0 ≤ x ≤ 1.5) were found in the system. K2VO(SO4)S2O7 and K2(VO)2(SO4)2S2O7 lose their sulfur trioxide when heated above 350°C under an inert atmosphere, and convert to K2VO(SO4)2 and K2(VO)2(SO4)3, respectively. This implies that K2VO(SO4)2S2O7 and K2(VO)2(SO4)2S2O7, as well as K2(VO)2 + x(SO4)2 + xS2O7 solid solution, cannot exist in the active component of real industrial catalysts

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12.
Инвентарный номер: нет.
   
   K 93


    Kurlov, A. S.
    Atomic-vacancy ordering in the lowest tungsten carbide W2C [Текст] / A. S. Kurlov, A. I. Gusev // Journal of Experimental and Theoretical Physics. - 2007. - Vol. 105, № 4. - С. 710-721. - Библиогр. : с. 721 (22 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АТОМНО-ВАКАНСИОННОЕ УПОРЯДОЧЕНИЕ -- КАРБИД ВОЛЬФРАМА
Аннотация: Atomic–vacancy ordering in the lowest tungsten carbide W2C with an L'3-type basic hexagonal structure has been studied by neutron diffraction and X-ray diffraction. In the temperature range 2700–1370 K, the only ordered phase of the lowest tungsten carbide is shown to be the trigonal ε-W2C phase (space group P1m). This trigonal ε-W2 C phase is found to form via a disorder–order phase transition channel, which includes three superstructure vectors (k15(1), k15(2), k17(1) ) of two Lifshitz stars ({k15}, {k17}, and to be described by two long-range order parameters (η15,η17). The distribution function of carbon atoms in the trigonal ε-W2C superstructure is calculated, and the orresponding region of the allowable values of the long-range order parameters η15 and η17 is found. Symmetry analysis of other possible superstructures of the lowest tungsten carbide W2C is performed, and the physically acceptable sequence of phase transformations in W2 C is determined

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13.
Инвентарный номер: нет.
   
   L 79


    Lipatnikov, V. N.
    Dependence of the resistivity of nonstoichiometric titanium carbide TiCy on the density and distribution of carbon vacancies / V. N. Lipatnikov, A. I. Gusev // Journal of Experimental and Theoretical Physics. - 1999. - Vol. 70, № 4. - P. 294-300 : il. - Bibliogr. : p. 300 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- КАРБИД ТИТАНА
Аннотация: The influence of temperature and of the density and distribution of structural vacancies in the carbon sublattice on the resistivity of nonstoichiometric titanium carbide TiCy (0.5
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14.
Инвентарный номер: нет.
   
   L 96


    Luk'yanov, S. A.
    Phase diagram of V-C system in region of ordering of cubic vanadium carbide [Text] / S. A. Luk'yanov, S. V. Rempel, A. I. Gusev // Physics and chemistry of novel materials: 4th Bilateral Russian-German Symposium (Febr. 24-March 1, 1999): Progr. and abstr. - 1999. - P2.18
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ДИАГРАММЫ ФАЗОВЫЕ -- ФАЗОВЫЕ ДИАГРАММЫ -- V-C -- КАРБИД ВАНАДИЯ -- НЕСТЕХИОМЕТРИЯ -- МЕТАЛЛЫ ПЕРЕХОДНЫЕ -- ПЕРЕХОДНЫЕ МЕТАЛЛЫ -- БЕСПОРЯДОК-ПОРЯДОК -- V -- ВАНАДИЙ

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15.
Инвентарный номер: нет.
   
   L 96


   
    Luminescence of a transparent alumina ceramic doped with chromium and titanium / V. S. Kiiko, Yu. N. Makurin, A. A. Safronov, A. N. Enyashin, A. L. Ivanovskii // Refractories and Industrial Ceramics. - 2003. - Vol. 44, № 2. - P94-98 : il. - Bibliogr. : p. 98 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЛЮМИНЕСЦЕНЦИЯ -- ХРОМ -- ТИТАН -- КЕРАМИКА
Аннотация: Specimens of transparent alumina ceramic (TAC) are prepared by slip casting. An alumina spinel, formed during sintering under vacuum or under reducing conditions, as well as individual phases, produced by thermochemical doping with chromium and titanium, are identified. The spectra of steady-state x-ray luminescence (SXL) and pulsed cathodoluminescence (PCL) and the PCL decay kinetics are studied. The highest STL and PCL intensity were observed in specimens that were prepared by thermal diffusion using a carbon +TiO2 pack. Ti-doped TAC, characterized by a rapid decay of luminescence in the UV region, can be recommended as a promising material for the detector of a scintillation dosimeter. The luminescent chromium ions (isomorphic substituents of aluminum ions in the crystal lattice) are unsuitable for that purpose because of their long luminescence de-excitation time

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16.
Инвентарный номер: нет.
   
   M 78


    Moiseev, G. K.
    The subsolidus region and eutectic temperature in some binary systems [Text] / G. K. Moiseev, A. L. Ivanovskii // Russian Journal of Physical Chemistry A. - 2007. - Vol. 81, № 8. - P1203-1207. - Bibliogr. : p. 1207 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СУБСОЛИДУС -- ЭВТЕКТИКА -- БИНАРНЫЕ СИСТЕМЫ
Аннотация: The possibility of formation of solid solutions in the subsolidus region was estimated for 15 binary eutectic systems, including systems with idegeneratei eutectics. Interrelations between the eutectic transition temperature and various hysicochemical parameters of system components at the eutectic point are analyzed

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17.
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   O-69


   
    Order-disorder phase transformations and specific heat of nonstoichiometric vanadium carbide / V. N. Lipatnikov, A. I. Gusev, P. Ettmeier, W. Lengauer // Physics of the Solid State. - 1999. - Vol. 41, № 3. - P474-480 : il. - Bibliogr. : p. 480 (25 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЕ ПЕРЕХОДЫ -- КАРБИД ВАНАДИЯ
Аннотация: A study has been made of the order-disorder phase transformations in the homogeneity region of the VCy nonstoichiometric cubic vanadium carbide (0.66,y,0.88). It has been established that an ordered V6C5 phase with monoclinic ~space group C2/m) or trigonal (P31) symmetry, and a cubic ~space group P4332) ordered V8C7 phase can form in the VCy carbide below 1450 K, depending on the actual composition. The effect of off-stoichiometry and structural vacancy ordering on the specific heat of the VCy carbide has been investigated. The temperatures and heats of the reversible order-disorder equilibrium transitions have been determined. The ordering in the VCy carbide is shown to be a first-order phase transition. An equilibrium diagram of the V-C system taking into account ordering in the nonstoichiometric vanadium carbide has been constructed

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18.
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   O-97


   
    Oxygen Nonstoichiometry and the Thermodynamic and Structural Properties of Double Perovskites PrBaCo2-xCuxO5+δ / A. Yu. Suntsov, I. A. Leonidov, A. A. Markov, M. V. Patrakeev, Ya. N. Blinovskov, V. L. Kozhevnikov // Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 5. - P832-838 : il. - Bibliogr. : p. 838 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НЕСТЕХИОМЕТРИЯ -- ДВОЙНЫЕ ПЕРОВСКИТЫ -- РЗМ -- БАРИЙ
Аннотация: The special features of the structure, electrophysical properties, and oxygen nonstoichiometry of new double perovskites PrBaCo2 –xCuxO5 +δ were studied. Within the homogeneity region with respect to copper 0
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19.
Инвентарный номер: нет.
   
   P 41


   
    Penetration of High-Frequency Electromagnetic Field through Bulk Samples of La1-xSrxMnO3 (0.33≤x≤0.60) Manganites / A. P. Nosov, A. B. Rinkevich, V. G. Vasil'ev, E. V. Vladimirova // The Physics of Metals and Metallography. - 2008. - Vol. 106, № 1. - P34-42 : il. - Bibliogr. : p. 41-42 (26 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МАНГАНИТЫ -- ЭЛЕКТРОМАГНИТНЫЕ ПОЛЯ
Аннотация: —Penetration of radio-frequency electromagnetic field through bulk samples of La1 –xSrxMnO3(0.33≤x≤0.60) manganites has been studied in the frequency range from 20 kHz to 30 MHz at temperatures from 300 to 400 K, which includes the temperature of the magnetic phase transition of some investigated compositions. It has been shown that, in spite of the differences in the static properties, the dynamic properties of the investigated compositions of these manganites are similar; the differences are mainly pronounced at frequencies higher than 1 MHz. In the ferromagnetic range, significant changes in the transmission coeffiicient have been observed for all compositions upon magnetization. The magnitudes of the initial dynamic magnetic permeability have been estimated. The changes in the transmission coefficient in the ferromagnetic region are mainly caused by changes in the dynamic magnetic permeability rather than by agnetoresistance. It is shown that in the paramagnetic temperature range the magnitude of the dynamic reversible permeability exceeds unity for all compositions, which supports the assumption on the retention of local magnetic ordering

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20.
Инвентарный номер: нет.
   
   P 56


   
    Phase Relations in the Zn2V2O7–Cu2V2O7 System / T. I. Krasnenko, M. V. Rotermel', S. A. Petrova, R. G. Zakharov, O. V. Sivtsova, A. N. Chvanova // Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 10. - P1641-1647 : il. - Bibliogr. : p. 1647 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПИРОВАНАДАТЫ -- ФАЗОВЫЕ СООТНОШЕНИЯ
Аннотация: Phase relations in the Zn2V2O7–Cu2V2O7 system were studied by high-temperature X-ray diffraction and differential thermal analysis. The major phase constituents of the system are solid solutions based on Zn2V2O7 and Cu2V2O7 polymorphs and their coexistence regions. The generation of α-Zn2 – 2xCu2xV2O7 solid solution, where 0 ≤ ı ≤ 0.30, leaves almost unchanged the stabilization temperature of the high-temperature zinc pyrovanadate phase. The α-Cu2 – 2xZn2xV2O7 homogeneity range is 5 mol % Zn2V2O7. In the range 0.050 ≤ ı ≤ 0.09 from 20 to ~ 620°ë, there is the two-phase field of α-Cu2V2O7 and β-Cu2V2O7 base solid solutions. At still higher temperatures, β-Zn2 – 2xCu2xV2O7 and α-Cu2 – 2xZn2xV2O7 coexist in the mixedphase region. β-Zn2 – 2xCu2xV2O7 solid solution, where 0 ≤ ı ≤ 0.30, exists above 610 ± 5°ë. The extent of the β'-Cu2V2O7-base solid solution is 9 to 65 mol % Zn2V2O7 at 615 ± 5°ë, expanding to 0 mol % Zn2V2O7 with rising temperature

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