Центральная Научная Библиотека УрО РАН

Вид документа : Статья из журнала
Шифр издания : 54/S 81
Автор(ы) : Pletnev R. N., Kupryazhkin A. Ya., Dmitriev A. V., Zabolotskaya E. V.
Заглавие : State of hydrogen in cubic zirconium dihydride
Место публикации : Journal of Structural Chemistry. - 2002. - Vol. 43, № 3. - С. 445-448: il.
Примечания : Bibliogr. : p. 448 (15 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): дигидрид циркония--водород--парамагнитный резонанс
Аннотация: PMR spectra have been recorded and the proton spin–lattice relaxation time has been measured for cubic hydride δ-ZrH2. It is found that above 290 K thermally activated diffusion of hydrogen takes place. In the region 230 K, a reversible phase transition takes place, which is due to a change in the state of hydrogen in the crystal lattice of zirconium dihydride. Possible mechanisms of this transition are discussed
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/E 43
Автор(ы) : Zainullina V. M., Zhukov V. P., Zubkov V. G., Tyutyunnik A. P.
Заглавие : Electronic structure and chemical bonding in Sr4Nb17O26
Место публикации : Journal of Structural Chemistry. - 1998. - Vol. 39, № 5. - С. 627-635: il.
Примечания : Bibliogr. : p. 634-635 (15 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/S 90
Автор(ы) : Gromilov S. A., D’yachkova T. V., Yusenko K. V., Kireenko I. B., Tyutyunnik A. P., Zainullin Yu. G.
Заглавие : Study of the Re0.50Rh0.50 products of thermobaric treatment
Место публикации : Journal of Structural Chemistry. - 2009. - Vol. 50, № 2. - С. 306-311: il.
Примечания : Bibliogr. : p. 310-311 (20 ref.)
ISSN: 0022-4766
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): родий--рений--микротвердость--рентгенофазовый анализ--термолиз
Аннотация: The products of thermobaric treatment of the metastable Re0.50Rh0.50 nanocrystalline phase (a = 2.733(2) Å, c = 4.364(4) Å, space group P63/mmc, CSR ~5 nm) in a high-pressure chamber were studied. Storage of the phase at 2000C and 1.5 GPa for 3 min led to the formation of a fused particle (diam.~1 mm). The initial composition did not change, but the coherent scattering region (CSR) increased to 52 nm. An increase to 4 GPa in pressure also did not lead to a decomposition of the metastable Re0.50Rh0.50 phase, the unit cell parameters remained the same, and the size of the CSR increased by a factor of four
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/R 42
Автор(ы) : Rempel A. A.
Заглавие : Surface Segregation of ZrC from a Carbide Solid Solution
Место публикации : Physics of the Solid State. - 2002. - Vol. 44, № 1. - С. 68-74: il.
Примечания : Bibliogr. : p. 74 (14 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): сегрегация поверхностная--карбид циркония--твердые растворы
Аннотация: The surface segregation of zirconium carbide from carbide solid solutions is investigated. The spontaneous surface segregation of ZrC grains from solid solutions in the pseudobinary ZrC–NbC system is revealed for the first time. It is demonstrated that the ZrC precipitation is associated with the decomposition of the carbide homogeneous solid solutions Zr1 – xNbxC = (ZrC)1 – x(NbC)x. The boundaries of the latent solid-phase&&decomposition region formed at T 1200 K are determined for the solid solutions formed by ZrCy and NbCy carbides with different nonstoichiometry. The experimental and theoretical estimates obtained for the segregation energy of ZrC are equal to –50 and –31 kJ mol–1, respectively
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/O-69
Автор(ы) : Lipatnikov V. N., Gusev A. I., Ettmeier P., Lengauer W.
Заглавие : Order-disorder phase transformations and specific heat of nonstoichiometric vanadium carbide
Место публикации : Physics of the Solid State. - 1999. - Vol. 41, № 3. - С. 474-480: il.
Примечания : Bibliogr. : p. 480 (25 ref.)
ISSN: 1063-7834
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/D 26
Автор(ы) : Davydov D. A., Rempel A. A.
Заглавие : Refinement of the V–O Phase Diagram in the Range 25–50 at % Oxygen
Место публикации : Inorganic Materials. - 2009. - Vol. 45, № 1. - С. P. 47-54 : il.
Примечания : Bibliogr. : p. 53-54 (36 ref.)
ISSN: 0020-1685
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/R 42
Автор(ы) : Rempel A. A., Gusev A. I.
Заглавие : ZrC Segregation to the Surface of Dilute Solid Solutions of Zirconium Carbide in Niobium Carbide
Место публикации : Inorganic Chemistry. - 2001. - Vol. 37, № 10. - С. P. 1024-1029: il.
Примечания : Bibliogr. : p. 1028-1029 (23 ref.)
ISSN: 0020-1685
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): растворы твердые--карбид ниобия--карбид циркония--сегрегация
Аннотация: Precipitation of crystalline ZrC in the surface region of dilute ZrC–NbC solid solutions (1.0 mol % ZrC) was revealed by electron microscopy, x-ray microanalysis, laser mass spectrometry, and x-ray diffraction. The ZrC precipitation was shown to be a consequence of the diffusional decomposition of the dilute Zr1 – xNbxC solid solutions. The boundaries of the solid-miscibility gap in the ZrCy–NbCy system were calculated. The segregation energy of zirconium carbide was estimated at –33.3 kJ/mol
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/L 79
Автор(ы) : Lipatnikov V. N., Gusev A. I.
Заглавие : Dependence of the resistivity of nonstoichiometric titanium carbide TiCy on the density and distribution of carbon vacancies
Место публикации : Journal of Experimental and Theoretical Physics. - 1999. - Vol. 70, № 4. - С. P. 294-300: il.
Примечания : Bibliogr. : p. 300 (17 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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 (0.5y0.98) is studied. It is shown that in titanium carbide TiCy with y,0.7 reversible disorder– order structural phase transitions occur at temperatures below 1000 K. The temperatures of order–disorder phase transformations are determined. The dependence of the residual resistivity on the composition of the disordered titanium carbide is explained by the change in the carrier density in the region of homogeneity of the carbide TiCy , on the one hand, and the atom–vacancy interaction, on the other
Найти похожие

Вид документа : Статья из журнала
Шифр издания : 54/S 89
Автор(ы) : Ermakova L. V., Strekalovskii V. N., Vovkotrub E. G., Bamburov V. G.
Заглавие : Structural transformations in a Bi2O3 crystal and in Bi2O3-based solid solutions in the temperature interval 25–750 C
Место публикации : Journal of Applied Spectroscopy. - 2002. - Vol. 69, № 1. - С. 152-154: il.
Примечания : Bibliogr. : p. 154 (6 ref.)
ISSN: 0021-9037
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): оксид висмута--рамановская спектроскопия--фазовый переход
Аннотация: The Raman scattering spectra of isostructural Bi2O3 and Bi1.8Tm0.2O3 in the course of heating have been investigated. It is shown that the sequences of structural changes with increase in temperature differ: α → δ and δ* → β → δ, respectively. In the high-temperature region, the structure takes the form of a disordered cube irrespective of the previous history of specimens
Полный текст
Найти похожие

10.

Вид документа : Статья из журнала
Шифр издания : 54/G 96
Автор(ы) : Gusev A. I.
Заглавие : of NonstoichiometricEffect of Carbon Vacancies on the Electric Resistivity of Nonstoichiometric VCy Vanadium Carbide
Место публикации : JETP Letters. - 2009. - Vol. 90, № 3. - С. 191-196: il.
Примечания : Bibliogr. : p. 196 (21 ref.)
ISSN: 0021-3640
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

11.

Вид документа : Статья из журнала
Шифр издания : 54/P 80
Автор(ы) : Polyakov E. V.
Заглавие : Behavior of Ionic and Colloid Forms of Microelements in Colloidal Chemical Extraction from Humic Acid Solutions
Место публикации : Radiochemistry. - 2007. - Vol. 49, № 4. - С. 432-438: il.
Примечания : Bibliogr. : p. 437-438 (44 ref.)
ISSN: 1066-3622
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): коллоидно-химическая экстракция--гуминовая кислота--растворы--микроэлементы
Аннотация: Speciation and extractability of humic acids (HAs) and humate complexes of microelements are studied using the colloidal chemical extraction method in combination with ICP MS with an example of natural mineral water with high HA concentration (800 -1200 mg l(1) collected from the Salekhard region. Joint extraction behavior of ionic and colloid forms of anionic and cationic species of a large number of microelements, including U(VI) and Th(IV), and HAs is examined at their natural abundance in mineral water, as influenced by pH and HA concentration. Humic acids proved to behave in natural water as a pool of ioncolloidal species, whose protonation results in precipitation at pH 2.0 -3.5. In this case, some chemical elements are sorbed on the resulting solid and may be separated along with HAs by colloidal chemical extraction into isobutanol. In natural humate solutions, a considerable fraction (10 -99 mol %) of chemical elements is associated with HAs in the form of colloid species extractable with isobutanol
Полный текст
Найти похожие

12.

Вид документа : Статья из журнала
Шифр издания : 54/A 58
Автор(ы) : Animitsa I. E., Dogodaeva E. N., Zabolotskaya E. V.
Заглавие : Structure and Electrical Properties of Oxygen-Deficient Strontium Copper Niobate
Место публикации : Russian Journal of Inorganic Chemistry. - 2010. - Vol. 55, № 2. - С. 254-260: il.
Примечания : Bibliogr. : p. 260 (15 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

13.

Вид документа :
Шифр издания : 54/C 91
Автор(ы) : Zhuravlev V. D., Zubkov V. G., Tyutyunnik A. P., Velikodnyi Yu. A., Koryakin N. D.
Заглавие : Crystal Structures of La1-xSr2+x(GeO4)(V1-xMoxO4) (x=0-0.4) Solid Solutions
Место публикации : Russian Journal of Inorganic Chemistry. - 2009. - Vol. 54, № 1. - С. 134-136: il.
Примечания : Bibliogr. : p. 136 (11 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

14.

Вид документа : Статья из журнала
Шифр издания : 54/O-97
Автор(ы) : Suntsov A. Yu., Leonidov I. A., Markov A. A., Patrakeev M. V., Blinovskov Ya. N., Kozhevnikov V. L.
Заглавие : Oxygen Nonstoichiometry and the Thermodynamic and Structural Properties of Double Perovskites PrBaCo2-xCuxO5+δ
Место публикации : Russian Journal of Physical Chemistry A. - 2009. - Vol. 83, № 5. - С. 832-838: il.
Примечания : Bibliogr. : p. 838 (11 ref.)
ISSN: 0036-0244
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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 x≤1, solid solution samples had an orthorhombic structure (space group Pmmm) with the parameters ap×2ap×2ap, where ap≈3.8Å. The oxygen nonstoichiometry of PrBaCo2 –xCuxO5 +δ changes as the copper content increases approximately as δ ≈0.85 –x/2. The content of oxygen was measured by coulometric titration over wide temperature and oxygen pressure ranges. The partial thermodynamic functions of labile oxygen were calculated and the limits of the thermodynamic stability of the solid solution were established
Полный текст
Найти похожие

15.

Вид документа : Статья из журнала
Шифр издания : 54/S 12
Автор(ы) : Sadovnikov S. I., Gusev A. I.
Заглавие : Effect of particle size on the thermal expansion of nanostructured lead sulfide films
Место публикации : Journal of Alloys and Compounds. - 2014. - Vol. 610. - С. 196-202.
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): нестехиометрия--тепловое расширение--размер наночастиц--сульфид свинца
Аннотация: The effect of particle size on the thermal expansion of nanostructured lead sulfide films produced by hydrochemical deposition has been studied. The coherent scattering region size and thermal expansion coefficients of PbS nanofilm have been measured depending on the annealing temperature in the interval 293–473 K and on the duration of annealing at a constant temperature of 423 K. It is found that the thermal expansion coefficient α of nanostructured PbS film is nearly twice as large as that of bulk lead sulfide. It is shown that the observed large difference in the coefficients α is due to the small size of PbS particles in the film that leads to the change of the phonon spectrum boundaries and to the growth of anharmonicity of atomic vibrations. The additional contribution to the thermal expansion coefficient caused by the small particle size in PbS nanofilm is estimated theoretically.
Найти похожие

16.

Вид документа : Статья из журнала
Шифр издания : 54/P 41
Автор(ы) : Nosov A. P., Rinkevich A. B., Vasil'ev V. G., Vladimirova E. V.
Заглавие : Penetration of High-Frequency Electromagnetic Field through Bulk Samples of La1-xSrxMnO3 (0.33≤x≤0.60) Manganites
Место публикации : The Physics of Metals and Metallography. - 2008. - Vol. 106, № 1. - С. 34-42: il.
Примечания : Bibliogr. : p. 41-42 (26 ref.)
ISSN: 0031-918X
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

17.

Вид документа :
Шифр издания : 54/K 81
Автор(ы) : Krasil'nikov V. N.
Заглавие : Phase Ratios in the K2O-V2O4-SO3 System at High Sulfur Trioxide Concentrations
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 2. - С. 258-262: il.
Примечания : Bibliogr. : p. 262 (15 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

18.

Вид документа : Статья из журнала
Шифр издания : 54/L 96
Автор(ы) : Kiiko V. S., Makurin Yu. N., Safronov A. A., Enyashin A. N., Ivanovskii A. L.
Заглавие : Luminescence of a transparent alumina ceramic doped with chromium and titanium
Место публикации : Refractories and Industrial Ceramics. - 2003. - Vol. 44, № 2. - С. 94-98: il.
Примечания : Bibliogr. : p. 98 (12 ref.)
ISSN: 1083-4877
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

19.

Вид документа :
Шифр издания : 54/Z 90
Автор(ы) : Zuev M. G.
Заглавие : Subsolidus Phase Relations in the Al2O3–Li2O–Ta2O5 (Nb2O5) Systems
Место публикации : Russian Journal of Inorganic Chemistry. - 2007. - Vol. 52, № 3. - С. 424-426: il.
Примечания : Bibliogr. : p. 426 (28 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): субсолидус--фазовые диаграммы--ванадаты--ниобаты--литий
Аннотация: The phase composition has been studied and an equilibrium phase diagram has been designed for the Al2O3–Li2O–R2O5 (R = Ta or Nb) systems in the subsolidus region up to 1000°C and 85 mol % Li2O. New phases with the composition Li1 + xAl1 – xO2 – x, where x = 0–0.67, have been found
Полный текст
Найти похожие

20.

Вид документа :
Шифр издания : 54/P 56
Автор(ы) : Krasnenko T. I., Rotermel' M. V., Petrova S. A., Zakharov R. G., Sivtsova O. V., Chvanova A. N.
Заглавие : Phase Relations in the Zn2V2O7–Cu2V2O7 System
Место публикации : Russian Journal of Inorganic Chemistry. - 2008. - Vol. 53, № 10. - С. 1641-1647: il.
Примечания : Bibliogr. : p. 1647 (21 ref.)
ISSN: 0036-0236
ББК : 54
Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ
Ключевые слова (''Своб.индексиров.''): 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
Полный текст
Найти похожие

1-20 21-40 41-42

Сиглы отделов ЦНБ УрО РАН

  бр.ф. - Бронированный фонд

  бф - Научно-библиографический отдел

  БХЛ - Фонд художественной литературы

  ИИиА -Фонд исторической литературы в ЦНБ УрО РАН

  ИМЕТ -Отдел ЦНБ в Институте металлургии УрО РАН

  кх - Отдел фондов (книгохранениe)

  МБА - Межбиблиотечный абонемент

  мф - Методический фонд

  ок - Отдел научной каталогизации

  оку - Отдел комплектования и учета

  орф - Обменно-резервный фонд

  пф - Читальный зал деловой и патентной информации

  рк - Фонд редкой книги

  ч/з - Главный читальный зал

  эр - Зал электронных ресурсов

Сиглы библиотек институтов и НЦ УрО РАН

© Международная Ассоциация пользователей и разработчиков электронных библиотек и новых информационных технологий
(Ассоциация ЭБНИТ)