Segregation during the vertical Bridgman growth of lead magnesium niobate-lead titanate single crystals

被引：68

作者：

Zawilski, KT ^{[1
]}

Custodio, MCC ^{[1
]}

DeMattei, RC ^{[1
]}

Lee, SG ^{[1
]}

Monteiro, RG ^{[1
]}

Odagawa, H ^{[1
]}

Feigelson, RS ^{[1
]}

机构：

[1] Stanford Univ, Dept Mat Sci & Engn, Adv Mat Lab, Stanford, CA 94305 USA

来源：

JOURNAL OF CRYSTAL GROWTH | 2003年 / 258卷 / 3-4期

关键词：

characterization; segregation; Bridgman technique; oxides; ferroelectric materials; piezoelectric materials;

D O I：

10.1016/S0022-0248(03)01552-5

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

Transparent, high-quality lead magnesium niobate lead titanate, (1-x)PbMg1/3Nb2/3O3-xPbTiO(3), or PMNT, crystals were grown using the vertical Bridgman method. Crystals grown from 35% PT (x = 0.35) and 32% PT (x = 0.32) melts were found to vary in composition along the axial direction (from 30% to 72% PT along the growth direction). Crystals grown from 10% PT melts were found to be uniform in composition. Effective segregation coefficients were determined. All crystals examined had uniform radial composition profiles, indicating a flat growth interface. Dielectric measurements were performed on (0 0 1) oriented samples cut from a crystal grown from a 35% PT melt. Powder X-ray diffraction analysis revealed the presence of a two-phase region (tetragonal and rhombohedral) between 31% PT and 36% PT. Poling was performed on (0 0 1) samples of composition 32% PT. Upon poling, as-grown, cloudy crystals became optically transparent, and observations under crossed polarizers showed the formation of large single domain regions. Analysis of 32% PT samples showed a transition from two phases (rhombohedral and tetragonal) in the as-grown sample to single phase (rhombohedral) after poling. The high-temperature phase diagram for PMNT was estimated using a combination of differential thermal analysis and compositional data from growth experiments. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：353 / 367

页数：15

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