Published October 2000 | Version v1
Journal article Metadata-only

Doping effects on the physicochemical and electrochemical properties of lanthanum manganite

Creators

  • 1. NII Fiziko-Khimicheskikh problem BGU, Minsk (Belarus)

Description

The cubic structure perovskites of the La0.7Ca0.3Mn1-x(Co,Ni)xO3 (1) and La0.6Sr0.4Mn1-x(Co,Ni)xO3 (2) compositions, where x = 0, 0.02, 0.05, 0.1, are synthesized at 1270-1470 K. It is shown, that alloying by transition metals increases the concentration of the Mn4+ ions for the composition (1) from 26% (x = 0) up to 49% (x(Co) = 0.1) and for the composition (2) from 49% (x = 0) up to 57% (x(Co) = 0.05). The maximum electric conductivity (34.5 Cm/cm) for the composition (1) with x(Ni) = 0.05 is observed at 300 K and Co addition decreases it. The electric conductivity for the composition (2) by all concentrations of additions increases and obtains the values from 250 Cm/cm (x = 0) up to 700 Cm/cm (x(Ni) = 0.02). The character of temperature dependence in the area of 300-1100 K is semiconductive one for the calcium-containing manganites and metallic one for the strontium-containing manganites

Abstract (Russian)

Синтезированы при 1270-1470 К перовскиты кубической структуры составов La0.7Ca0.3Mn1-x(Co,Ni)xO3 (1) и La0.6Sr0.4Mn1-x(Co,Ni)xO3 (2), где х = 0, 0,02, 0,05, 0,1. Показано, что легирование переходными металлами увеличивает концентрацию ионов Mn4+ для состава (1) от 26% (х = 0) до 49% (x(Co) = 0,1), а для состава 2 от 49% (х = 0) до 57% (х(Со) = 0,05). При 300 К для состава 1 с x(Ni) = 0,05 наблюдается максимальная электропроводность (34,5 См/см), а добавка Со уменьшает ее. Для состава 2 проводимость возрастает для всех концентраций добавок и принимает значения от 250 См/см (х = 0) до 700 См/см (x(Ni) = 0,02). В области 300-1100 К характер температурной зависимости для кальцийсодержащих манганитов полупроводниковый, а для стронцийсодержащих - металлический

Additional details

Additional titles

Original title (Russian)
Влияние легирования на физико-химичексие и электрохимические характеристики манганита лантана

Publishing Information

Journal Title
Neorganicheskie Materialy
Journal Volume
36
Journal Issue
10
Journal Page Range
p. 1231-1238
ISSN
0002-337X
CODEN
NEOMB8

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
32054224
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CALCIUM OXIDES; COBALT ADDITIONS; CONCENTRATION RATIO; ELECTRIC CONDUCTIVITY; LANTHANUM OXIDES; MANGANESE OXIDES; NICKEL ADDITIONS; STRONTIUM OXIDES; SYNTHESIS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 1000-4000 K
Descriptors DEC
ALKALINE EARTH METAL COMPOUNDS; ALLOYS; CALCIUM COMPOUNDS; CHALCOGENIDES; COBALT ALLOYS; ELECTRICAL PROPERTIES; LANTHANUM COMPOUNDS; MANGANESE COMPOUNDS; NICKEL ALLOYS; OXIDES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; RARE EARTH COMPOUNDS; STRONTIUM COMPOUNDS; TEMPERATURE RANGE; TRANSITION ELEMENT ALLOYS; TRANSITION ELEMENT COMPOUNDS

Optional Information

Notes
15 refs.; 8 figs.