Synthesis, structure and physical properties of reduced barium titanate Ba2Ti13O22

被引：2

作者：

Kataoka, Kunimitsu ^{[1
,2
]}

Kijima, Norihito ^{[1
]}

Hayakawa, Hiroshi ^{[1
]}

Iyo, Akira ^{[1
]}

Ohshima, Ken-ichi ^{[2
]}

Akimoto, Junji ^{[1
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058565, Japan

[2] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058573, Japan

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2011年 / 184卷 / 11期

基金：

日本学术振兴会;

关键词：

Oxides; X-ray diffraction; Electrical conductivity; CRYSTAL-STRUCTURE;

D O I：

10.1016/j.jssc.2011.09.008

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Polycrystalline sample of the reduced barium titanate Ba2Ti13O22 was synthesized by solid state reaction at 1523 K in Ar atmosphere for the first time. The Rietveld refinement using the powder X-ray diffraction data confirmed the sample to be main phase of Ba2Ti13O22 having the orthorhombic crystal system, space group Bmab and the lattice parameters of a = 11.67058(11) angstrom, b = 14.12020(13) angstrom and c = 10.06121(9) angstrom, and V = 1657.995(20) angstrom(3). The valence state of Ti was evaluated by both the Ti-O bond distance analysis and the Ti K-edge XANES analysis. The magnetic susceptibility was nearly temperature independent in the range of 60-300 K, suggesting the Van Vleck Paramagnetism. The electrical conductivity at 300 K is approximately 320.50 S/cm, and a semiconducting behavior was observed below room temperature. The Seebeck coefficient showed a negative value of -1.25 mu V/K at 300 K, indicating n-type behavior. These facts were confirmed by the results of the present theoretical calculations by the FLAPW method. (C) 2011 Elsevier Inc. All rights reserved.

引用

页码：3117 / 3120

页数：4

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