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Titolo:
Alternating-current electrical properties of CaMnO3 below the Neel temperature
Autore:
Jung, WH; Sohn, JH; Lee, JH; Sohn, JH; Park, MS; Cho, SH;
Indirizzi:
Kyungpook Natl Univ, Dept Inorgan Mat Engn, Taegu 702701, South Korea Kyungpook Natl Univ Taegu South Korea 702701 , Taegu 702701, South Korea Howon Univ, Dept Elect, Kunsan 573930, Chonbuk, South Korea Howon Univ Kunsan Chonbuk South Korea 573930 573930, Chonbuk, South Korea Kaya Univ, Dept Elect Ceram Engn, Koryong 717800, Kyungpook, South Korea Kaya Univ Koryong Kyungpook South Korea 717800 00, Kyungpook, South Korea
Titolo Testata:
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
fascicolo: 4, volume: 83, anno: 2000,
pagine: 797 - 801
SICI:
0002-7820(200004)83:4<797:AEPOCB>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDATION-REDUCTION BEHAVIOR; SR-DOPED LAMNO3; DEFECT STRUCTURE; CONDUCTIVITY; SPECTROSCOPY; RELAXATION; IMPEDANCE; PEROVSKITES; TRANSPORT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
32
Recensione:
Indirizzi per estratti:
Indirizzo: Lee, JH Kyungpook Natl Univ, Dept Inorgan Mat Engn, 1370 Sankyuk Dong, Taegu 702701, South Korea Kyungpook Natl Univ 1370 Sankyuk Dong Taegu South Korea 702701 ea
Citazione:
W.H. Jung et al., "Alternating-current electrical properties of CaMnO3 below the Neel temperature", J AM CERAM, 83(4), 2000, pp. 797-801

Abstract

The alternating-current electrical properties of polycrystalline CaMnO3 were investigated by alternating current complex-impedance analysis, and the dielectric properties were analyzed over the temperature and frequency ranges of 10 to 130 K and 20 Hz to 1 MHz, respectively. Direct-current conductivity and the Seebeck coefficient as a function of temperature also were analyzed, Below 120 K, a Debye-type dielectric relaxation peak was observed. Experimental results implied that the number of charge carriers, which were generated by Mn3+, were not sufficient to stabilize small polarons, although it induced lattice distortion by the Jahn-Teller effect. Therefore, the thermal motion of Mn3+ between potential minimums produced by lattice distortion in the orthorhombic structure were believed to be the source of dielectric relaxation. The temperature dependence of conductivity of the grain interior (sigma(gi)) below 120 K was believed to be due to variable rangehopping conduction, where sigma(gi) approximate to exp(-T-1/4).

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Documento generato il 30/09/20 alle ore 12:30:37