Preparation and electrical properties of La2-xSrxMnO4+δ with K2NiF4-structure

Takahisa Omata, Susumu Hoshino, Hiroyuki Ikawa, Tadashi Sasamoto

研究成果: Article査読

4 被引用数 (Scopus)

抄録

Polycrystalline bodies of La2-xSrxMnO4+δ (1.0qqxqq2.0) with a K2NiF4-structure were prepared by a standard ceramic method. Lattice parameters, electrical conductivity and Seebeck voltage were measured. Furthermore, optical absorption spectra were recorded to obtain information on changes in the electronic structure in the vicinity of the energy band gap. Changes in lattice parameters were attributed to the disappearance of Jahn-Teller distortion of MnO6-octahedra upon Sr-doping. The results suggested that holes doped in the present system were mainly localized on manganese ions. The temperature dependence of electrical conductivities of all the samples was almost Arrhenius-type. Seebeck voltages and optical absorption spectra changed drastically in the composition ranges of 1.0<x<1.2 and 1.6<x<2.0. It was suggested that the electronic structure near the energy band gap changed drastically in those composition ranges.

本文言語English
ページ(範囲)1297-1301
ページ数5
ジャーナルNippon Seramikkusu Kyokai Gakujutsu Ronbunshi/Journal of the Ceramic Society of Japan
103
1204
DOI
出版ステータスPublished - 1995
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 化学 (全般)
  • 凝縮系物理学
  • 材料化学

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