The tetragonal<->cubic phase transition in mixed perovskite Ba1-xCaxTiO3 single crystals: EPR evidence of impurity-induced dynamic effects

被引：5

作者：

Babu, Y

Sastry, MD

Dasannacharya, BA

Balakumar, S

Ilangovan, R

Ramasamy, P

Aggarwal, MD

机构：

[1] BHABHA ATOM RES CTR,SOLID STATE & SPECT GRP,BOMBAY 400085,MAHARASHTRA,INDIA

[2] ANNA UNIV,CTR CRYSTAL GROWTH,MADRAS 600025,TAMIL NADU,INDIA

[3] ALABAMA A&M UNIV,DEPT PHYS,NORMAL,AL 35762

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 1996年 / 8卷 / 42期

关键词：

D O I：

10.1088/0953-8984/8/42/004

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

By using EPR of Fe3+ probe ions in Ba1-xCaxTiO3 (x = 0 and 0.05), clear evidence has been obtained for the existence of dynamic fluctuation between cubic and tetragonal phases in the vicinity of the phase transition temperature. This was manifested as a total absence of the EPR of Fe3+ in the temperature range 112-160 degrees C for x = 0.05, clearly showing that there is a rime-dependent interaction serving as an additional and more effective pathway of spin relaxation. The time scale of the fluctuation is estimated to be 6 x 10(-11) s.

引用

页码：7847 / 7856

页数：10

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