AC CONDUCTIVITY IN BISMUTH-SUBSTITUTED BARIUM HEXAFERRITES

被引：14

作者：

PAL, M ^{[1
]}

BRAHMA, P ^{[1
]}

CHAKRAVORTY, D ^{[1
]}

机构：

[1] GURUDAS COLL,CALCUTTA,W BENGAL,INDIA

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1994年 / 63卷 / 09期

关键词：

AC CONDUCTIVITY; BISMUTH-SUBSTITUTED BARIUM HEXAFERRITES; OVERLAPPING-LARGE-POLARON TUNNELING;

D O I：

10.1143/JPSJ.63.3356

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Bismuth substituted barium hexaferrites in the composition series BaO.(6-x) Fe2O3.xBi(2)O(3) with 0<x<0.5 have been prepared and their electrical conductivity measured over the temperature range 325 to 510 K. The ac conductivity of the samples obeys a relation sigma(omega) similar to omega(s) with s having values in the range 0.5 to 0.8. The electrical conductivity is believed to arise due to the creation of Fe2+ sites by the reducing action of Bi3+ ions. The ac conductivity variation is explained on the basis of overlapping-large-polaron-tunnelling (OLPT) mechanism.

引用

收藏

页码：3356 / 3360

页数：5

相关论文

共 15 条

[1] POLARONS IN CRYSTALLINE AND NON-CRYSTALLINE MATERIALS [J].

AUSTIN, IG ;

MOTT, NF .

ADVANCES IN PHYSICS, 1969, 18 (71) :41-+

[2] MAGNETIC-PROPERTIES OF AS2O3-DOPED AND SB2O3-DOPED BA-M HEXAGONAL FERRITES PREPARED BY THE SOL-GEL METHOD [J].

BRAHMA, P ;

GIRI, AK ;

CHAKRAVORTY, D ;

ROY, M ;

BAHADUR, D .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1992, 117 (1-2) :163-168

[3] CRYSTALLIZATION OF BA-M FERRITE IN A GLASS WITH SB2O3 AS NUCLEATION CATALYST [J].

BRAHMA, P ;

CHOUDHURY, K ;

GUHA, R ;

CHAKRAVORTY, D .

JOURNAL OF MATERIALS SCIENCE LETTERS, 1989, 8 (05) :540-542

[4] ELECTRICAL-CONDUCTION IN GLASS-FIBERS SUBJECTED TO A SODIUM REVERSIBLE SILVER ION-EXCHANGE TREATMENT [J].

CHAKRAVORTY, D ;

SHRIVASTAVA, A .

JOURNAL OF PHYSICS D-APPLIED PHYSICS, 1986, 19 (11) :2185-2195

[5] THEORY OF AC CONDUCTION IN CHALCOGENIDE GLASSES [J].

ELLIOTT, SR .

PHILOSOPHICAL MAGAZINE, 1977, 36 (06) :1291-1304

[6] AC CONDUCTION IN AMORPHOUS-CHALCOGENIDE AND PNICTIDE SEMICONDUCTORS [J].

ELLIOTT, SR .

ADVANCES IN PHYSICS, 1987, 36 (02) :135-218

[7] STUDIES OF SMALL-POLARON MOTION .4. ADIABATIC THEORY OF HALL EFFECT [J].

EMIN, D ;

HOLSTEIN, T .

ANNALS OF PHYSICS, 1969, 53 (03) :439-&

[8] DIELECTRIC-PROPERTIES AND POLARONIC CONDUCTIVITY OF WO3 AND WXMO1-XO3 [J].

GEHLIG, R ;

SALJE, E .

PHILOSOPHICAL MAGAZINE B-PHYSICS OF CONDENSED MATTER STATISTICAL MECHANICS ELECTRONIC OPTICAL AND MAGNETIC PROPERTIES, 1983, 47 (03) :229-245

[9] DIELECTRIC RELAXATIONS AND ELECTRICAL TRANSPORT DUE TO NONADIABATIC SMALL POLARONS IN P-TYPE NIO DOPED WITH LI [J].

IGUCHI, E ;

AKASHI, K .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1992, 61 (09) :3385-3393

[10] ESTIMATES OF ANDERSON ELECTRON-PHONON-COUPLING CONSTANTS FOR NONADIABATIC SMALL POLARONS IN N-TYPE BATIO3 USING A POLARIZABLE POINT-ION SHELL-MODEL [J].

IGUCHI, E ;

TAMENORI, A ;

KUBOTA, N .

PHYSICAL REVIEW B, 1992, 45 (02) :697-706