Polytypic modifications in heavily Tb and Eu doped gadolinium aluminum borate crystals

被引：5

作者：

Beregi, E. ^{[1
]}

Sajo, I. ^{[2
]}

Lengyel, K. ^{[1
]}

Bombicz, P. ^{[2
]}

Czugler, M. ^{[2
]}

Foeldvari, I. ^{[1
]}

机构：

[1] HAS, Wigner Res Ctr Phys, Inst Solid State Phys & Opt, Budapest, Hungary

[2] HAS, Res Ctr Nat Sci, Budapest, Hungary

来源：

JOURNAL OF CRYSTAL GROWTH | 2012年 / 351卷 / 01期

基金：

匈牙利科学研究基金会;

关键词：

Crystal structure; X-ray diffraction; Single crystal growth; Top seeded solution growth; Borates; Rare earth compounds; AL-BORATE; HUNTITE; GROWTH; ND;

D O I：

10.1016/j.jcrysgro.2012.04.031

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The evidence of a new polytypic phase was demonstrated in double doped gadolinium aluminum borate (GAB) crystals grown by the high temperature top seeded solution growth (HTTSSG) method. The structures of the rhombohedral and the new monoclinic phases in the Eu0.02Tb0.12Gd0.86Al3(BO3)(4) and Eu0.18Tb0.19Gd0.63Al3(BO3)(4) compositions were determined by single crystal and powder X-ray diffraction methods. The monoclinic crystals with different compositions have identical structures with space group C2/c. It was concluded that the starting crystallization temperature was the dominant factor in formation of the rhombohedral and monoclinic phases. The crystals with non-centrosymmetric rhombohedral structure (R32) may possess similar compositions as the previous ones but their starting crystallization temperature was lower. (c) 2012 Elsevier B.V. All rights reserved.

引用

页码：72 / 76

页数：5

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