Rhombohedral to cubic phase transition in the relaxor ferroelectric PZN

被引：26

作者：

Forrester, JS ^{[1
]}

Kisi, EH

Knight, KS

Howard, CJ

机构：

[1] Univ Newcastle, Sch Engn, Newcastle, NSW 2308, Australia

[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

[3] Australian Nucl Sci & Technol Org, Menai, NSW 2234, Australia

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2006年 / 18卷 / 19期

关键词：

D O I：

10.1088/0953-8984/18/19/L02

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The structure and phase transition in lead zinc niobate (PZN) were studied using very high resolution powder neutron diffraction between 4.2 and 450 K. The structure is unequivocally rhombohedral in space group R3m with a = 4.060 48 angstrom and alpha = 89.8693 degrees at 4.2 K. No low symmetry phases were observed, nor was an octahedral tilting transition to R3c as occurs in some parallel systems (e.g. PZT). Within the rhombohedral structure, large average ion displacements were found relative to the rather small spontaneous strains. On heating, a transition to a cubic perovskite occurs, with a critical temperature of similar to 384 K.

引用

页码：L233 / L240

页数：8

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