RAMAN-SCATTERING STUDY OF ACCEPTOR-DOPED BACEO3

被引:84
|
作者
SCHERBAN, T
VILLENEUVE, R
ABELLO, L
LUCAZEAU, G
机构
[1] LIESG, ENSEEG, 38402 St. Martin d'Héres
基金
美国国家科学基金会;
关键词
D O I
10.1016/0167-2738(93)90339-5
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
Raman scattering studies of perovskite-structured BaCeO3 acceptor-doped with the rare earth ions Yb3+, Gd3+ and Nd3+ are presented. Room temperature spectra of BaCeO3 doped with 5% Yb3+ and 5% Gd3+ are similar to that observed for undoped BaCeO3, having an orthorhombic perovskite structure. However, 5% doping with Nd3+ results in a strikingly different Raman spectrum with fewer bands, indicating a tetragonal structure. Moreover, the distortion of the structure towards the higher symmetry phase is an increasing function of Nd dopant concentration, 10% doping giving a nearly cubic structure. A broad band appearing at 624 cm-1 which increases in intensity with increasing Nd dopant concentration probably arises from dopant-oxygen ion vibrational modes. The Raman scattering results are interpreted in terms of the ionic radii of the dopants and, further, are compared to existing conductivity results.
引用
收藏
页码:93 / 98
页数:6
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