Disorder in BaTiO3 and Ti EFG tensors

被引：4

作者：

Blinc, R ^{[1
]}

Seliger, J ^{[1
]}

Zalar, B ^{[1
]}

机构：

[1] Jozef Stefan Inst, SI-1001 Ljubljana, Slovenia

来源：

INTEGRATED FERROELECTRICS | 2004年 / 61卷

关键词：

order-disorder; quadrupole coupling; phase transition;

D O I：

10.1080/10584580490460231

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The motionally averaged electric field gradient tensors at the Ti-sites have been evaluated within the 8-site Ti disorder model for the various phases of BaTiO3. The results have been compared with the experimental data and with the observation of a non-zero Ti quadrupole coupling in the cubic phase. The pure 8-site "order-disorder" model does not agree with the experiment. A good agreement is however obtained if in addition to the dynamic Ti disorder the "displacive" soft mode induced deformation of the unit cell shape is taken into account. The presence of the soft mode and the Ti disorder leads to a special type of phase transition with combined "displacive" and "order-disorder" character.

引用

页码：255 / 260

页数：6

共 12 条

[1]

AXE JD, 1972, PHYS REV B, V6, P4332

[2] ANOMALOUS ACOUSTIC DISPERSION IN CENTROSYMMETRIC CRYSTALS WITH SOFT OPTIC PHONONS [J].