铋掺杂钛酸锶陶瓷晶界纳米颗粒的平衡形状分析

doi:10.3724/SP.J.1077.2012.11516

无机材料学报 ›› 2012, Vol. 27 ›› Issue (7): 741-745.DOI: 10.3724/SP.J.1077.2012.11516

铋掺杂钛酸锶陶瓷晶界纳米颗粒的平衡形状分析

邢娟娟^1,2, 顾辉¹

(1. 中国科学院上海硅酸盐研究所, 上海200050; 2. 日本国立材料研究所, 筑波3050003)

收稿日期:2011-08-16 修回日期:2011-11-02 出版日期:2012-07-20 网络出版日期:2012-06-06
作者简介:邢娟娟(1980-), 女, 博士, 助理研究员. E-mail: XING.Juanjuan@nims.go.jp
基金资助:
国家杰出青年科学基金(50525205)

Analysis on Equilibrium Shape of Nano-precipitations at Grain Boundaries in Bismuth Doped Strontium Titanate Ceramics

XING Juan-Juan^{1, 2}, GU Hui¹

(1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China; 2. National Institute for Materials Science, Tsukuba 3050003, Japan)

Received:2011-08-16 Revised:2011-11-02 Published:2012-07-20 Online:2012-06-06
About author:XING Juan-Juan. E-mail: XING.Juanjuan@nims.go.jp
Supported by:
National Natural Science Funds for Distinguished Young Scholar (50525205)

摘要/Abstract

摘要： 利用透射电子显微镜对铋掺杂钛酸锶陶瓷晶界结构进行表征, 在某些晶界处观测到不连续分布的纳米颗粒, 尺寸为十几至一百多纳米, 形状各有迥异. 能谱分析结果表明这些纳米颗粒为金属铋. 采用Cahn-Hoffman ξ矢量构建模型可以把晶界纳米颗粒形状定性地描述为相邻晶粒内两个独立平衡形状(Wulff形状)在晶界处的交集, 两个平衡形状中心间的距离与晶界能相当. 晶界纳米颗粒的平衡形状与两个独立平衡Wulff形状本身特征、相邻两侧晶粒的晶体学取向、晶界能和晶界的倾转以及颗粒本身尺寸等因素相关.

关键词: 晶界, 纳米颗粒, Wulff形状, ξ矢量, TEM

Abstract: Grain boundary structures in Bi-doped strontium titanate ceramics were characterized by transmission electron microscope (TEM). Discontinuous nano-precipitations (NPs), whose sizes ranged from ten to over one hundred nanometers, were observed aligning along some grain boundaries. The composition of NP was detected as pure bismuth by spatial difference energy dispersive X-ray spectra (EDXS) method. Different shapes with facets were possessed by the NPs, indicating the anisotropy of NPs. The Cahn-Hoffman ξ-vector construction based on anisotropic surfaces was successfully applied to qualitatively describe the equilibrium shape of NP, which can be regarded as the intersection of two Wulff shapes at the grain boundaries. The distance between the two Wulff shapes centers is equal to the grain boundary energy. The Wulff shape itself, orientation of neighboring grains, grain boundary energy and grain boundary twist are considered as the important factors to affect the equilibrium shape of NP. Besides these, the size of NP will also influence the faceting of NP. This work is helpful to deepen the understanding of the microstructure evolvement during the sintering.

Key words: grain boundary, nano-precipitation, Wulff shape, ξ-vector, TEM

中图分类号:

TQ174

邢娟娟, 顾辉. 铋掺杂钛酸锶陶瓷晶界纳米颗粒的平衡形状分析[J]. 无机材料学报, 2012, 27(7): 741-745.

XING Juan-Juan, GU Hui. Analysis on Equilibrium Shape of Nano-precipitations at Grain Boundaries in Bismuth Doped Strontium Titanate Ceramics[J]. Journal of Inorganic Materials, 2012, 27(7): 741-745.

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铋掺杂钛酸锶陶瓷晶界纳米颗粒的平衡形状分析

Analysis on Equilibrium Shape of Nano-precipitations at Grain Boundaries in Bismuth Doped Strontium Titanate Ceramics

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