Published December 2002 | Version v1
Journal article Metadata-only

Transport properties of Ca1-xMnO3-δ + xCeO2 (0 ≤ x ≤ 0.15) mixtures

Creators

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

Description

The temperature dependences of the specific electric conductivity and thermo-electromotive force of the Ca1-xMnO3-δ + xCeO2 (0 ≤ x ≤ 0.15) two-phase mixtures, formed at the intermediate stage of Ca1-xCexMnO3-δ solid solution formation, are studied. It is established, that electrical properties of the mixtures are determined by the properties of the Ca1-xMnO3-δ perovskite-type phase and depend on the Ca concentration. All the samples in the interval of 0 ≤ x ≤ 0.15 are the n-type semiconductors. It is shown that the charge transport in the CaMnO3-δ may be explained on the account of the small radius polarons jumps. The conductivity by delocalized states is obvious prevailing at higher temperatures

Abstract (Russian)

Исследованы температурные зависимости удельной электропроводности и термо-э.д.с. двухфазных смесей Ca1-xMnO3-δ + xCeO2 (0 ≤ x ≤ 0.15), образовавшихся на промежуточной стадии синтеза твердого раствора Ca1-xCexMnO3-δ. Найдено, что электрические свойства смесей определяются свойствами перовскитоподобной фазы Ca1-xMnO3-δ и зависят от концентрации Са. В интервале 0 ≤ x ≤ 0.15 все образцы являются полупроводниками n-типа. Показано, что при Т < 930 K перенос заряда в CaMnO3-δ можно объяснить за счет прыжков поляронов малого радиуса. При более высоких температурах, по-видимому, преобладает проводимость по делокализованным состояниям

Additional details

Additional titles

Original title (Russian)
Электрофизические свойства двухфазных смесей Cа

Publishing Information

Journal Title
Neorganicheskie Materialy
Journal Volume
38
Journal Issue
12
Journal Page Range
p. 1491-1498
ISSN
0002-337X
CODEN
NEOMB8

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
35010208
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CALCIUM OXIDES; CARRIER MOBILITY; CERIUM OXIDES; CHARGE CARRIERS; ELECTRIC CONDUCTIVITY; MANGANESE OXIDES; PHASE STUDIES; SEMICONDUCTOR MATERIALS; TEMPERATURE DEPENDENCE; THERMOELECTRIC PROPERTIES
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; CALCIUM COMPOUNDS; CERIUM COMPOUNDS; CHALCOGENIDES; ELECTRICAL PROPERTIES; MANGANESE COMPOUNDS; MATERIALS; MOBILITY; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
17 refs., 5 figs., 2 tabs.