Published August 2003 | Version v1
Journal article Metadata-only

Interrelation of structural features and oscillation dynamics of atoms in crystal lattice of lithium orthogermanate in range of superionic state

Creators

  • 1. UrO RAN, Inst. Fiziki Metallov, Ekaterinburg (Russian Federation)
  • 2. UrO RAN, Inst. Vysokotemperaturnoj Ehlektrokhimii, Ekaterinburg (Russian Federation)

Description

The crystal structure and oscillation dynamics of lithium atoms of solid electrolytes Li3.75Ge0.75V0.25O4 and Li3.70Ge0.85W0.15O4 in the area of superionic state are studied via neutron diffraction and NMR methods. It is ascertained that there exist in the lattice four nonequivalent lithium positions with tetra-and octahedral surrounding by oxygen ions, whereby there are vacancies in the octahedrons. These results agree well with NMR spectroscopy conclusions on the availability of the dynamic nonuniformity of lithium cations in the lattice. It is shown that superionic state in the above-mentioned compounds is conditioned mainly by geometric factor, namely by increase in the dimensions of windows in oxygen polyhedrons, surrounding lithium cations

Abstract (Russian)

Методами нейтронной дифракции и ЯМР изучены кристаллическая структура и динамика колебаний атомов лития твердых электролитов Li3.75Ge0.75V0.25O4 и Li3.70Ge0.85W0.15O4 в области суперионного состояния. Установлено, что в решетке существует четыре неэквивалентных позиции лития с тетра- и октаэдрическим окружением ионами кислорода, причем в октаэдрах имеются вакансии. Эти результаты хорошо согласуются с выводами ЯМР спектроскопии о наличии в решетке динамической неоднородности катионов лития. Показано, что суперионное состояние в данных соединениях обусловлено в основном геометрическим фактором, а именно увеличением размера окон в кислородных полиэдрах, окружающих катионы лития

Additional details

Additional titles

Original title (Russian)
Взаимосвязь структурных особенностей и динамики колебаний атомов кристаллической решетки ортогерманатов лития в области суперионного состояния

Publishing Information

Journal Title
Fizika Tverdogo Tela
Journal Volume
45
Journal Issue
8
Journal Page Range
p. 1475-1481
ISSN
0367-3294
CODEN
FTVTAC

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
36106758
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Descriptors DEI
ACTIVATION ENERGY; GERMANATES; IONIC CONDUCTIVITY; LATTICE PARAMETERS; LITHIUM COMPOUNDS; NEUTRON DIFFRACTION; NUCLEAR MAGNETIC RESONANCE; ORTHORHOMBIC LATTICES; RELAXATION TIME; SOLID SOLUTIONS; SPIN-LATTICE RELAXATION; STRUCTURAL CHEMICAL ANALYSIS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TUNGSTEN COMPOUNDS; VANADIUM COMPOUNDS
Descriptors DEC
ALKALI METAL COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; DISPERSIONS; ELECTRIC CONDUCTIVITY; ELECTRICAL PROPERTIES; ENERGY; GERMANIUM COMPOUNDS; HOMOGENEOUS MIXTURES; MAGNETIC RESONANCE; MIXTURES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; REFRACTORY METAL COMPOUNDS; RELAXATION; RESONANCE; SCATTERING; SOLUTIONS; TEMPERATURE RANGE; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
17 refs., 4 figs., 2 tabs.