Structural effects of Li and Nb codoping in a KTaO3 matrix:: A Raman investigation

被引：0

作者：

Galinetto, P

Giulotto, E

Camagni, R

Samoggia, G

Trepakov, VA ^{[1
]}

Boatner, LA

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Dipartimento Fis A Volta, I-27100 Pavia, Italy

[3] Ist Nazl Fis Mat, I-27100 Pavia, Italy

[4] Oak Ridge Natl Lab, Div Solid State, Oak Ridge, TN 37831 USA

[5] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia

来源：

RADIATION EFFECTS AND DEFECTS IN SOLIDS | 2001年 / 155卷 / 1-4期

关键词：

phase transitions; impurity centers; Raman spectroscopy;

D O I：

10.1080/10420150108214124

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Raman investigations on single crystals of K1-xLixTa1-yNbyO3 were performed to identify structural effects arising from the simultaneous presence of off-centre Li and Nb ions in the incipient ferroelectric KTaO3. Two soft-mode transitions were evidenced at 45 K and 30 K in a sample with x=0.0014 and y=0.024 after both zero-field and field cooling. These temperatures are close to the maximum and to the extrapolated Curie temperature for non-relaxing permittivity reported in the same system. A sample with x=0.0028 and y=0.013 displayed a ferroelectric transition just below 30 K only after field cooling, also being consistent with permittivity data.

引用

页码：259 / 263

页数：5

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