Ba1-xRxF2+x phases (R=Gd-Lu) with distorted fluorite-type structure -: Products of crystallization of incongruent melts in the BaF2-RF3 systems.: I.: Ba0.75R0.25F2.25 crystals (synthesis and some characteristics)

被引：16
|
作者：
Sobolev, BP
Golubev, AM
Krivandina, EA
Marychev, MO
Chuprunov, EV
Alcobe, X
Gali, S
Pascual, L
Rojas, RM
Herrero, P
机构：
[1] Russian Acad Sci, AV Shubnikov Crystallog Inst, Moscow 117333, Russia
[2] Bauman State Tech Univ, Moscow 107005, Russia
[3] Nizhni Novgorod State Univ, Nizhnii Novgorod 630600, Russia
[4] Univ Barcelona, Barcelona, Spain
[5] Inst Ciencia Mat, Madrid, Spain
来源：
CRYSTALLOGRAPHY REPORTS | 2002年 / 47卷 / 02期
基金：
俄罗斯基础研究基金会;
关键词：
D O I：
10.1134/1.1466493
中图分类号：
O7 [晶体学];
学科分类号：
0702 ; 070205 ; 0703 ; 080501 ;
摘要：
The transparent monolithic crystal rods grown by crystallization of the incongruent Ba(0.7)5R(0.25)F(2.25) melts (R = Gd-Yb) are shown to be heterogeneous: the larger part of the crystal volume has a distorted fluorite-type cubic lattice, while the smaller part retains an undistorted cubic structure. The distortions were recorded by the methods of X-ray powder and electron diffraction and crystal optics. Two types of chemical heterogeneity of Ba0.75R0.25F2.25 crystals are considered as possible sources of distortions: (1) a macroheterogeneous (at a level of I mm) distribution of RF3 over the crystal-rod diameter (a cellular substructure) and (2) a microheterogeneous (cluster) structure with the nanometer dispersion typical of nanostructured materials. (C) 2002 MAIK "Nauka/Interperiodica".
引用
收藏
页码：201 / 212
页数：12
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