Ca doping in BaTiO3 crystal: Effect on the Raman spectra and vibrational modes

被引：26

作者：

Ouni, Ines Bejaoui ^{[1
]}

Chapron, David ^{[2
,3
]}

Aroui, Hassen ^{[1
]}

Fontana, Marc D. ^{[2
,3
]}

机构：

[1] Univ Tunis, Ecole Natl Super Ingn Tunis, Lab Dynam Mol & Mat Photon, Tunis, Tunisia

[2] Univ Lorraine, EA 4423, LMOPS, 2 Rue E Belin, F-57070 Metz, France

[3] Cent Supelec, EA 4423, LMOPS, 2 Rue E Belin, F-57070 Metz, France

来源：

JOURNAL OF APPLIED PHYSICS | 2017年 / 121卷 / 11期

关键词：

DOPED BARIUM-TITANATE; TETRAGONAL BATIO3; TEMPERATURE-DEPENDENCE; OPTICAL PHONONS; CERAMICS; BEHAVIOR; CALCIUM; A1;

D O I：

10.1063/1.4978507

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Polarized Raman measurements were carried out in a 3% Ca- doped BaTiO3 (BCT) single crystal and compared with those in undoped BaTiO3 (BT) in order to study the effect of Ca2+ incorporation into the BT lattice. Spectra recorded at room temperature in BCT show peaks unexpected by the Raman selection rules in BT, proving an off-centering of Ca with respect to the Ba site in BT. Main phonon lines A1 polarized along the ferroelectric c axis are notably shifted to lower frequency by Ca doping, while the phonons E in the plane normal to c are nearly unaffected. In addition, the modes A1 are highly anharmonic, even more than in BT, as revealed by the temperature dependences of their frequency and damping which are analyzed in terms of 3rd and 4th order anharmonic potential. Published by AIP Publishing.

引用

页数：6

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