LATTICE-CONSTANTS OF K-DOPED AND MG-DOPED LINBO3 - COMPARISON WITH NONSTOICHIOMETRIC LITHIUM-NIOBATE

被引:54
作者
MALOVICHKO, G
CERCLIER, O
ESTIENNE, J
GRACHEV, V
KOKANYAN, E
BOULESTEIX, C
机构
[1] UNIV AIX MARSEILLE 1,CTR DIFFRACTOMETRIE,F-13003 MARSEILLE,FRANCE
[2] INST PHYS RES,ASHTARAK 2,ARMENIA
[3] UNIV AIX MARSEILLE 3,FAC SCI ST JEROME,F-13397 MARSEILLE,FRANCE
关键词
DEFECTS;
D O I
10.1016/0022-3697(95)00058-5
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
The dependencies of lithium niobate lattice constants on stoichiometry and concentration of K and Mg dopants were investigated with the help of X-ray powder diffraction. It was found that in contrast to MgO dopant, an addition of K2O to the congruent LiNbO3 melt leads to a decrease of the lattice constants. A similar reduction of a and c parameters is observed if the Li content of the crystal is increased, which is accompanied by an improvement of the lithium niobate lattice structure because of diminishing concentration of intrinsic nonstoichiometric defects.
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页码:1285 / 1289
页数:5
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