Phase relations in the system La2O3-CaO-B2O3

被引：35
|
作者：
Zhang, Y
Chen, XL
Liang, JK
Cao, YG
Xu, T
机构：
[1] Chinese Acad Sci, Inst Phys, Beijing 100080, Peoples R China
[2] Chinese Acad Sci, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China
[3] Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2001年 / 315卷 / 1-2期
基金：
中国国家自然科学基金;
关键词：
optical materials; oxide materials; X-ray diffraction; crystal structure; phase diagram;
D O I：
10.1016/S0925-8388(00)01276-7
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The subsolidus phase relations of the system La2O3-CaO-B2O3 are investigated by means of X-ray diffraction (XRD) analyses. There are seven binary compounds and five ternary compounds in this system. The phase diagram comprises eighteen three-phase regions. A new ternary compound Ca4LaO(BO3)(3) (CLOB) is identified. It has a monoclinic structure with cell parameters a=8.1732(1) Angstrom, b=16.0860(3) Angstrom, c=3.6268(1) Angstrom, beta =101.40(1)degrees and space group Cm. At low temperature, the XRD patterns of the CLOB compound indicate that a phase transition in the low temperature range is absent. The expansion coefficients in the three major directions are different, the value of alpha (c) being the largest. (C) 2001 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：198 / 202
页数：5
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