Phase transition in lanthanum doped lead germanate (Pb5Ge3O11) single crystal

被引：2

作者：

Ghulghule, J. R. ^{[1
]}

Durugkar, P. D. ^{[2
]}

Katpatal, A. G. ^{[3
]}

机构：

[1] YCCE Wanadongri, Dept Appl Phys, Nagpur, Maharashtra, India

[2] SFS Coll, Dept Phys, Seminary Hills, Nagpur, Maharashtra, India

[3] VNIT, Dept Appl Phys, Nagpur, Maharashtra, India

来源：

FERROELECTRICS | 2016年 / 500卷 / 01期

关键词：

Dielectric properties; phase transition; rare earth doping effect; FERROELECTRIC PHASE; GROWTH; IONS;

D O I：

10.1080/00150193.2016.1230443

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Single crystals of pure(LG), 0.5wt% (LG1) and 1wt% (LG2) lanthanum doped lead germanate were grown by controlled cooling of the melt. The dielectric constant and loss tangent of LG crystals showed sharp maxima at 180 degrees C while for doped crystals LG1 and LG2 are observed at temperatures 160 degrees C and 155 degrees C respectively. The calculated curie constants for LG, LG1 and LG2 are 1.16 x 10(4)K, 2.22 x 10(4)K and 2.42 x 10(4)K respectively. Doping has lowered the ferroelectric transition temperature retaining the ferroelectric nature. These results suggest a tendency towards a diffused phase transition with increasing doping concentration. A possible mechanism for the shift in transition temperature is discussed.

引用

页码：301 / 309

页数：9

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