Neutron powder diffraction studies on Ba3Ca1+xNb2-xO9-3x/2-complex perovskite-type oxides

被引：22

作者：

Oikawa, K ^{[1
]}

Kamiyama, T

Ikeda, S

Shishido, T

Yamaguchi, S

机构：

[1] High Energy Accelerator Res Org, Tsukuba, Ibaraki 3050801, Japan

[2] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan

[3] Chiba Inst Technol, Inst Res, Narashino, Chiba 2750016, Japan

来源：

SOLID STATE IONICS | 2002年 / 154卷

关键词：

proton conductor; complex perovskite-type oxide; Ba3Ca1+xNb2-xO9-3x/2; neutron powder diffraction; Rietveld refinement;

D O I：

10.1016/S0167-2738(02)00511-8

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

High-resolution neutron powder diffraction data were collected on the Ba3Ca1+xNb2-xO9-3x/2 (x=0.10, 0.18, 0.25 and 0.35) at room temperature, All the data were precisely refined by the Rietveld method based on several structure models. Considering the variations of bond lengths and polyhedral volumes of [BO6] octahedra, the most suitable structure model for this system was found to be rhombohedral one based on the space group Rim (a approximate to 5.95 Angstrom, alpha approximate to 60.0degrees), which was slightly distorted from the cubic model based on the space group Fm (3) over barm (a approximate to 8.41 Angstrom). (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：641 / 646

页数：6

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