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Общее количество найденных документов : 65
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1.
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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2.
Инвентарный номер: нет.
   
   G 96


    Gusev, A. I.
    Ordered Phases of Lithium Nickelite Li1 – x – zNi1 + xO2 / A. I. Gusev // JETP Letters. - 2004. - vol. 79, № 4. - С. 148-154 : il. - Bibliogr. : p. 153-154 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НИКЕЛИТ ЛИТИЯ -- ФАЗЫ УПОРЯДОЧЕННЫЕ
Аннотация: A symmetry analysis of ordering in lithium nickelite Li1 – x – zNi1 + xO2 (Li1 – x – z hyNi1 + xO2) was performed with regard to the substitution of Li and Ni atoms and the occurrence of structural vacancies h in the metal sublattice. For all the ordered phases, the ray of the Lifshitz {k9} star is present in the order–disorder transition channel. This ray determines the consecutive alternation of atomic planes filled with only Ni atoms or only Li atoms and vacancies in the direction. It was shown that the rhombohedral ordered LiNiO2 phase is formed in the defect-free lithium nickelite, whereas a family of three monoclinic Li3 hNi4O8 (C2/m space group) and Li2 hNi3O6 (C2/m and C2 space groups) superstructures arises as the concentration of structural vacancies increases. For all the superstructures, the order–disorder phase-transition channels were determined and the distribution functions of Li and Ni atoms have been calculated. The long-range order parameters describing each superstructure were found as functions of the Li1 – x – zNi1 + xO2 composition

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3.
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   V 86


    Volkova, E. G.
    Synthesis and Morphology of Nanodimensional Structures of Vanadium Oxide Doped with Lithium / E. G. Volkova, V. L. Volkov, N. V. Podval'naya // Inorganic Materials. Aplied Research. - 2010. - vol. 1, № 1. - P. 54-56 : il. - Bibliogr. : p. 56 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
НАНОСТРУКТУРЫ -- СИНТЕЗ -- ВАНАДИЙ -- ЛИТИЙ
Аннотация: Nanodimensional powders of lithium-doped vanadium oxide of the formula Li0.4V2O5 · H2O are produced under hydrothermal conditions by the templateless synthesis method at 180°C from LiVO3–VOSO4–H2O solutions at pH = 3. The structure of the rods and the tubes formed by this method is examined by an electron microscopy method. The rods (up to 3 μm long and 25–50 nm in diameter) and the tubes (20–50 nm in outer and 2–6 nm in inner diameter) are oriented in the [010] direction. The distance between the layers is 10.30 ± 0.08 Å and 10.29 Å according to X-ray and electron diffraction data, respectively

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4.
Инвентарный номер: нет.
   
   S 89


   
    Structure and Transport Properties of Li1- 2xCO1 + xVO4 Lithium Ionic Conductors / I. A. Leonidov, R. F. Samigullina, O. N. Leonidova, B. V. Slobodin, M. V. Patrakeev, O. V. Koryakova // Inorganic Chemistry. - 2000. - Vol. 36, № 9. - P. 942-946 : il. - Bibliogr. : p. 945-946 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СВОЙСТВА ТРАНСПОРТНЫЕ -- ПРОВОДНИКИ ИОННЫЕ -- ШПИНЕЛИ -- ВАНАДАТЫ -- ЛИТИЙ
Аннотация: Li 1-x 2xCo 1 + xVO4 (0 < x <= 0.25) spinel solid solutions were synthesized and characterized by x-ray diffraction and IR spectroscopy. The materials were found to have a cubic structure in the composition range 0 < x <= 0.1 and an orthorhombic structure for x > 0.1. The observed lattice distortions were shown to correlate with Co content. The conductivity of the solid solutions was measured as a function of temperature and oxygen partial pressure. The ionic and electronic (n and p) conductivities were determined. The conduction in the solid solutions was shown to be dominated by Li + ions

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5.
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   K 46


   
    Kinetics of Domain Structure and Switching Currents in Single Crystals of Congruent and Stoichiometric Lithium Tantalate / V. Ya. Shur, E. V. Nikolaeva, E. I. Shishkin, V. L. Kozhevnikov, A. P. Chernykh // Physics of the Solid State. - 2002. - Vol. 44, № 11. - P2151-2156 : il. - Bibliogr. : p. 2156 (34 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
СТЕХИОМЕТРИЯ -- ТАНТАЛАТ ЛИТИЯ
Аннотация: A comparative analysis of polarization-switching kinetics in single crystals of congruent and stoichiometric lithium tantalate LiTaO3 is carried out by recording a sequence of instantaneous domain configurations (optical visualization of the evolution of the domain-structure) and the switching current simultaneously. A new mechanism of fast kinetics of domains in congruent lithium titanate due to the growth of steps formed during domain coalescence is discovered experimentally and studied with the help of computer simulation. Additional information on the domain kinetics in stoichiometric lithium tantalate is obtained on the basis of statistical analysis of the noise component of a switching current. A model is proposed for description of the jerky motion of domain walls

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6.
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   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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7.
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   E 43


   
    Electronic structure and chemical bonding in monoclinic and cubic Li2-xHxTiO3 (0 / V. M. Zainullina, V. P. Zhukov, T. A. Denisova, L. G. Maksimova // Journal of Structural Chemistry. - 2003. - Vol. 44, № 2. - P180-186 : il. - Bibliogr. : p. 186 (14ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ЭЛЕКТРОННАЯ СТРУКТУРА -- ТИТАНАТ ЛИТИЯ -- РАСЧЕТЫ ЭЛЕКТРОННЫХ СПЕКТРОВ -- МЕТАТИТАНОВАЯ КИСЛОТА
Аннотация: The linear "muffin-tin" orbitals method in a tight binding approximation and extended Huckel theory are used to study the electronic structure and chemical bonding of lithium titanate (Li2TiO3) and its protonated analogs (Li1:75H0:25TiO3 and H2TiO3). The e ect of protons on electron spectrum characteristics and bond strength are investigated for the monoclinic and cubic phases of lithium titanate. Phase stability is evaluated by cohesion energy calculations

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8.
Инвентарный номер: нет.
   
   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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9.
Инвентарный номер: нет.
   
   S 89


   
    Structural aspects of lithium transferin solid electrolytes Li2xZn2–3xTi1+xO4 (0.33 / I. A. Leonidov, O. N. Leonidova, R. F. Samigullina, M. V. Patrakeev // Journal of Structural Chemistry. - 2004. - Vol. 45, № 2. - P.262-268 : ил. - Bibliogr. : p. 268 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
РАСТВОРЫ ТВЕРДЫЕ -- ЭЛЕКТРОЛИТЫ ТВЕРДЫЕ -- ЛИТИЙ -- ПРОВОДИМОСТЬ -- ШПИНЕЛИ
Аннотация: Solid solutions Li2xZn2–3xTi1+xO4, where x = 1/3, 1/2, 3/5, 2/3, were studied by powder X-ray diffractometry and differential thermal analysis. Conductivity measurements have been performed in the gas phase at different temperatures and oxygen pressures. Distribution of cations over the sites of the spinel structure has been determined. Conductivity increases substantially with lithium concentration. The high lithium conductivity of Li3Zn0.5Ti4O10 (x = 3/5) and Li4Ti5O12 (x = 2/3) is the result of two sequential phase transitions associated with different lithium distributions in high-temperature phases with defective NaCl type structures. Possible routes of lithium ion transport are discussed and rationalized based on the conductivity and crystal data

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10.
Инвентарный номер: нет.
   
   G 15


    Galakhov, V. R.
    Electronic structure of defective lithium cobaltites LixCoO2 / V. R. Galakhov, M. Neumann, D. G. Kellerman // Applied Physics A. - 2009. - Vol. 94. - P.497-500 : il. - Bibliogr. : p. 500 (18 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
КОБАЛЬТИТ ЛИТИЯ -- СТРУКТУРА ЭЛЕКТРОННАЯ -- РЕНТГЕНОВСКИЕ ЭМИССИОННЫЕ СПЕКТРЫ
Аннотация: X-ray absorption, resonant X-ray emission, and??X-ray photoelectron spectroscopical methods have been applied for the study of the electronic structure of defective lithium cobaltites LixCoO2 (0.6 . x . 1.0). Resonant O K alfa X-ray emission spectra of LiCoO2 showed localized excitonic??states due to a dd transition between occupied and??unoccupied Co 3d states. On the base of measurements of Co 3s X-ray photoelectron, Co 2p, and O 1s X-ray absorption spectra, it was established that in defective cobaltites??the electronic holes are localized mainly in O 2p states. An evidence of phase separation in LixCoO2 has been found. It was shown that the semiconductor-to-metal transition in LixCoO2 (x <0.76) at about 160 K is not accompanied by??changes in the Co 3d electronic configuration which remains 3d6

\\\\Expert2\\nbo\\Applied Physics A Materials Science and Processing\\2009, v. 94, N 3, p. 497-500.pdf
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