Crystallization of mixed rare earth (didymium) molybdates in silica gel

被引：0
|
作者：
Sanjay Pandita
Ravender Tickoo
K. K. Bamzai
P. N. Kotru
Neera Sahni
机构：
[1] University of Jammu,Department of Physics
[2] Panjab University,Department of Geology
来源：
Bulletin of Materials Science | 2001年 / 24卷
关键词：
Crystal growth; didymium molybdate; gel method; morphology; EDAX;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Experiments on the growth of mixed rare earth (didymium—a combination of La, Nd, Pr and Sm) molybdates in silica gel medium are reported. The optimum conditions conducive for the growth of these crystals are described and discussed. Concentration programming is reported to enhance the size of crystals by two-fold; the maximum size obtained being about 1 mm3. EDAX results suggest the crystals to be heptamolybdates of type R2Mo7O24, bearing composition La1.23Nd0.43Pr0.29 Sm0.05Mo7024. The didymium molybdate crystals assume morphologies corresponding to those of spherulites, platelets, cuboids and coalesced crystals. Twinned structure in didymium molybdate crystals are also reported. It is explained that spherulitic morphologies result from aggregates of crystals joining in a spherical envelope. It is suggested that the crystals of didymium molybdates grow by two-dimensional spreading and piling up of layers.
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页码：435 / 440
页数：5
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