Evidence for MB and MC phases in the morphotropic phase boundary region of (1-x)[Pb(Mg1/3Nb2/3)O3]-xPbTiO3:: A Rietveld study -: art. no. 064102

被引：323

作者：

Singh, AK ^{[1
]}

Pandey, D ^{[1
]}

机构：

[1] Banaras Hindu Univ, Sch Mat Sci & Technol, Varanasi 221005, Uttar Pradesh, India

来源：

PHYSICAL REVIEW B | 2003年 / 67卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.67.064102

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We present here the results of the room-temperature dielectric measurements and Rietveld analysis of the powder x-ray diffraction data on (1-x)[Pb(Mg1/3Nb2/3)O-3]-xPbTiO(3)(PMN-xPT) in the composition range 0.20less than or equal toxless than or equal to0.45 to show that the morphotropic phase boundary region contains two monoclinic phases with space groups Cm (or M-B type) and Pm (or M-C type) stable in the composition ranges 0.27less than or equal toxless than or equal to0.30 and 0.31less than or equal toxless than or equal to0.34, respectively. The structure of PMN-xPT in the composition ranges 0less than or equal toxless than or equal to0.26 and 0.35less than or equal toxless than or equal to1 is found to be rhombohedral (R3m) and tetragonal (P4mm), respectively. These results are compared with the predictions of Vanderbilt & Cohen's theory.

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