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 Найдено в других БД:Каталог книг и продолжающихся изданий (5)Труды Института высокотемпературной электрохимии УрО РАН (3)Труды сотрудников Института органического синтеза УрО РАН (1)Расплавы (4)
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1.
Инвентарный номер: нет.
   
   C 32


   
    Cation Mobility in Modified Li1+xTi2-xCax(PO4)3 Lithium Titanium NASICON Phosphates / I. Yu. Pinus, I. V. Arkhangel’skii, N. A. Zhuravlev, A. B. Yaroslavtsev // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 8. - P1173-1176 : il. - Bibliogr. : p. 1176 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФОСФАТЫ -- ТИТАНАТ ЛИТИЯ
Аннотация: Li1 +xTi2 –xGax(PO4)3(x= 0–0.2) NASICON double phosphates are prepared and studied by hightemperature X-ray diffraction, 7Li NMR spectroscopy, impedance spectroscopy, and calorimetry. Doping with Ga3+cations increases cation mobility in LiTi2(PO4)3. Ion conductivity, NMR spectroscopy, and calorimetry data imply the occurrence of a phase transition in LiTi2(PO4)3 and in products of partial gallium-for-titanium substitution

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2.
Инвентарный номер: нет.
   
   P 56


   
    Phase Transformations and Cation Mobility in Li3-2xNbxIn2-x(PO4)3 Complex Phosphates / A. R. Shaikhlislamova, I. A. Stenina, N. A. Zhuravlev, I. V. Arkhangel’skii, A. I. Rebrov, A. B. Yaroslavtsev // Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 4. - P500-504 : il. - Bibliogr. : p. 504 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЙ ПЕРЕХОД -- ФОСФАТЫ
Аннотация: Cation mobility in Li3–2xNbxIn2 –x(PO4)3 complex phosphates was studied by impedance spectroscopy, calorimetry, and 7Li NMR spectroscopy. A phase transition at ≈273 K is suggested for compositions containing ≈1mol lithium per formula unit

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3.
Инвентарный номер: нет.
   
   S 98


   
    Synthesis, Crystal and Electronic Structures, and Thermodynamic Characteristics of BaCe1 – xInxO3 – x/2 Solid Solutions / T. I. Chupakhina, N. I. Matskevich, G. V. Bazuev, N. A. Ovechkina, V. R. Galakhov, M. Raeckers, M. Neumann // Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 7. - P1002-1009 : il. - Bibliogr. : p. 1008-1009 (37 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ПЕРОВСКИТЫ -- ТВЕРДЫЕ РАСТВОРЫ -- ОКСИД ЦЕРИЯ
Аннотация: New perovskite oxide phases BaCe1 – xInxO3 – x/2 (x = 0.1–0.8) (space group Pbnm) have been synthesized. The unit cell volume of the resulting solid solutions monotonically decreases with an increase in the degree of substitution of indium for cerium due to the contraction of octahedra in perovskite blocks. The thermodynamic stability of the compound BaCe0.75In0.25O2.875 was studied by the solution calorimetry method, and barium cerates were shown to be thermodynamically stable with respect to binary oxides at room temperature. The structure of occupied and vacant states in BaCe1 – xInxO3 – x/2 was determined on the basis of X ray emission, absorption, and photoelectron spectra, and the energy gap was estimated at ~2 eV

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4.
Инвентарный номер: нет.
   
   P 93


   
    Properties of the amorphous-nanocrystalline Gd2O3 powder prepared by pulsed electron beam evaporation / G. V. Ionov, S. Yu. Sokovnin, S. A. Uporov, M. G. Zuev // Physics of the Solid State. - 2013. - Vol. 55, № 6. - С. 1262-1271
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОПОРОШКИ -- ФАЗОВЫЕ ПРЕВРАЩЕНИЯ -- ФОТОЛЮМИНЕСЦЕНЦИЯ
Аннотация: An amorphous-nanocrystalline Gd2O3 powder with a specific surface area of 155 m2/g has been prepared using pulsed electron beam evaporation in vacuum. The nanopowder consists of 20- to 500-nm agglomerates formed by crystalline nanoparticles (3–12 nm in diameter) connected by amorphous-nanocrystalline strands. At room temperature, the Gd2O3 nanopowder exhibits a paramagnetic behavior. The phase transformations occurring in the powder have been investigated using differential scanning calorimetry and thermogravimetry (40–1400°C). The amorphous phase of the nanopowder is thermally stable up to a temperature of 1080°C. It has been found that the amorphous phase has an inhibitory effect on the temperature of the polymorphic transformation from the cubic phase into the monoclinic phase. It has been revealed that, compared with the microcrystalline powder, the Gd2O3 nanopowder is characterized by a complete quenching of photoluminescence.

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5.
Инвентарный номер: нет.
   
   T 44


   
    Thermochemical investigation of δ-Bi2O3 doped by Re2O7 and Sm2O3 / N. I. Matskevicha, Th. Wolfb, A. N. Bryzgalovaa, T. I. Chupakhina, E. S. Zolotovaa, M. Yu. Matskevich, M. A. Bespyatov // Thermochimica Acta. - 2014. - Vol. 575. - P17-20.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ОКСИД ВИСМУТА -- ОКСИД САМАРИЯ -- КАЛОРИМЕТРИЯ -- ТЕРМОДИНАМИЧЕСКАЯ УСТОЙЧИВОСТЬ
Аннотация: The Bi12.5Sm1.5ReO24.5 phase has been synthesized for the first time. The preparation of Bi12.5Sm1.5ReO24.5 has been carried out by solid-state reaction from Bi2O3, Sm2O3, and Re2O7. The X-ray measurements have showed that Bi12.5Sm1.5ReO24.5 was cubic structure (space group Fm3m). The standard molar enthalpy of formation of Bi12.5Sm1.5ReO24.5 has been determined by solution calorimetry combining the enthalpies of dissolution of Bi12.5Sm1.5ReO24.5 and 6.25Bi2O3 + 0.75Sm2O3 + 0.5Re2O7 mixture in 2 M HCl and literature data. It has been obtained that above-mentioned phase is thermodynamically stable with respect to their decomposition into binary oxides at room temperatures.

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6.
Инвентарный номер: нет.
   
   S 94


   
    Surface Laser Sintering of exothermic powder compositions: A thermal and SEM/EDX study [Текст] / I. V. Shishkovsky, V. I. Scherbakov, Yu. G. Morozov, M. V. Kuznetsov, I. P. Parkin // Journal of Thermal Analysis and Calorimetry. - 2008. - Vol. 91, № 2. - С. 427-436. - Библиогр. : с. 435 (16 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ

\\\\Expert2\\nbo\\Journal of Thermal Analysis and Calorimetry\\2008, v.91, N 2, p.427-436.pdf
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7.
Инвентарный номер: нет.
   
   P 36


   
    Peculiarities of antiferromagnetic ordering in orthorhombic LiMnO2 [Текст] / D. G. Kellerman, N. A. Zhuravlev, S. V. Verkhovskii, E. Yu. Medvedev, A. V. Korolev, J. E. Medvedeva // Physics of the Solid State. - 2008. - Vol. 50, № 7. - С. 1294-1302. - Библиогр. : с. 1301 (20 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
АНТИФЕРРОМАГНЕТИКИ -- МАГНИТНАЯ ВОСПРИИМЧИВОСТЬ -- МАНГАНИТ ЛИТИЯ
Аннотация: Data on the antiferromagnetic ordering in orthorhombic lithium manganite LiMnO2 are obtained from magnetic-susceptibility, calorimetry, and nuclear magnetic resonance studies. The minimal hysteresis and the absence of jumps in the temperature dependences of the sublattice magnetization M(T) and the magnetic susceptibility near TN indicate that the ordering occurs through a continuous second-order phase transition. Within the critical temperature range, the M(T–TN) variation is satisfactorily described by a power-law dependence with a critical exponent β= 0.25(4), which is substantially smaller than that predicted for 3D magnetic systems with isotropic Heisenberg exchange. The band structure of orthorhombic LiMnO2 is calculated using the LMTO–ASA method. Taking into account the spin states of manganese ions, an adequate pattern is obtained for the density-of-states distribution with an energy gap near the Fermi level (~0.7 eV), which is in agreement with the measured electrical parameters of lithium manganite. The calculations demonstrate that the exchange interactions between Mn3+ ions leading to antiferromagnetic ordering are significantly anisotropic. It is found that small paramagnetic regions persist in the manganite below the Néel temperature, and it is concluded that the reason for this is partial structural disordering of LiMnO 2 . As a result, a certain fraction of the manganese positions is occupied by lithium ions (Li Mn ) and vise versa (Mn Li ). These defects are not involved in the formation of the ordered magnetic structure and compose a paramagnetic fraction

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8.
Инвентарный номер: нет.
   
   P 56


   
    Phase Transitions of the NASICON-Type Mixed Phosphates LiM2(PO4)3 (M = Ti, Zr) and LiInNb(PO4)3 / I. Yu. Pinus, A. R. Shaikhlislamova, I. A. Stenina, N. A. Zhuravlev, A. B. Yaroslavtsev // Inorganic Materials. - 2009. - Vol. 45, № 12. - P. 1370-1374 : il. - Bibliogr. : p. 1373-1374 (17 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ФАЗОВЫЙ ПЕРЕХОД -- ИОНЫ ЛИТИЯ
Аннотация: The structural phase transitions of LiTi2(PO4)3, LiInNb(PO4)3, and LiZr2(PO4)3have been studied by X-ray diffraction, impedance spectroscopy, 7Li NMR spectroscopy, and calorimetry. The results indicate that, as the temperature is raised, the lithium ions in the structure of LiTi2(PO4)3 and LiInNb(PO4)3 redistribute between the M1 and M2 sites. The thermal expansion coefficients along the crystallographic axes of LiTi2(PO4)3and LiInNb(PO4)3 are estimated

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9.
Инвентарный номер: нет.
   
   S 89


   
    Structure, Ionic Conduction, and Phase Transformations in Lithium Titanate Li4Ti5O12 / I. A. Leonidov, O. N. Leonidova, L. A. Perelyaeva, R. F. Samigullina, S. A. Kovyazina, M. V. Patrakeev // Physics of the Solid State. - 2003. - Vol. 45, № 11. - P2183-2188 : il. - Bibliogr. : p. 2188 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ИОННАЯ ПРОВОДИМОСТЬ -- ФАЗОВЫЙ ПЕРЕХОД -- ТИТАНАТ ЛИТИЯ
Аннотация: The spinel structure of lithium titanate Li4Ti5O12 is refined by the Rietveld full-profile analysis with the use of x-ray and neutron powder diffraction data. The distribution and coordinates of atoms are determined. The Li4Ti5O12 compound is studied at high temperatures by differential scanning calorimetry and Raman spectroscopy. The electrical conductivity is measured in the high-temperature range. It is shown that the Li4Ti5O12 compound with a spinel structure undergoes two successive order–disorder phase transitions due to different distributions of lithium atoms and cation vacancies (vacancy, V) in a defect structure of the NaCl type: (Li)8a[Li0.33Ti1.67]16dO4-> [Li vacancy]16c[Li0.33Ti1.67]16dO4 [Li1.33 vacancy0.67]16c[Ti1.67 vacancy0.33]16dO4. The low-temperature diffusion of lithium predominantly occurs either through the mechanism … ->Li(8a)-> V(16c)->V(8a) … in the spinel phase or through the mechanism … Li(16c) ->V(8a)-> V(16c)-> … in an intermediate phase. In the high-temperature phase, the lithium cations also migrate over 48f vacancies: …->Li(16c)-> V(8a, 48f) ->V(16c) ->….

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10.
Инвентарный номер: нет.
   
   V 18


    Valeeva, A. A.
    Structure and specific heat of disordered and ordered titanium monoxide TiOy / A. A. Valeeva, A. A. Rempel, A. I. Gusev // Journal of Structural Chemistry. - 2003. - Vol. 44, № 2. - P235-242 : il. - Bibliogr. : p. 241-242 (14 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
МОНООКСИД ТИТАНА -- НЕСТЕХИОМЕТРИЯ -- РЕНТГЕНОВСКАЯ ДИФРАКЦИЯ
Аннотация: The structure of disordered and ordered titanium monoxide containing structural vacancies in both sublattices was studied by X-ray di raction. The symmetry of the monoclinic Ti5O5 superstructure (space group C2=m) was analyzed. The type and channel of the TiOy-Ti5O5 disorder-order transition was determined. The distribution functions of Ti and O atoms in the metal and nonmetal sublattices of titanium monoxide were calculated. The specific heats of TiOy titanium monoxides (0:8 < y < 1:27) were measured by dfferential scanning calorimetry for the disordered and ordered states in the range from 340 to 600 K. The dependences of the specific heat, enthalpy, and entropy on the composition and structure of TiOy were found for the first time. A notable effect of the structural state on the specific heat was detected. In the indicated temperature range, the Cp(T) dependence is adequately described by a function that accounts for the Debye effect and the electronic specific heat. Key words: titanium monoxide, nonstoichiometry, disorder-order phase transition, Ti5O5 superstructure, vacancy channels, X-ray diffraction, differential scanning calorimetry, specific heat

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