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Growth of lanthanum heptamolybdate crystals by gel technique

✍ Scribed by Sushma Bhat; Dr. P. N. Kotru

Publisher
John Wiley and Sons
Year
1994
Tongue
English
Weight
489 KB
Volume
29
Category
Article
ISSN
0232-1300

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✦ Synopsis

Abstract

The growth of single crystals of lanthanum heptamolybdate is achieved by allowing controlled diffusion of La ions through silica gel using the system La(NO~3~)~3~ο£ΏMoO~3~ο£ΏNH~4~OHο£ΏHNO~3~–Na~2~SiO~3~. The reaction mechanism leading to the growth is reported. Mechanism of crystallization of La heptamolybdate is discussed. Formation of Liesegang rings consisting of La heptamolybdate crystals in the system is reported. It is observed that concentration programming and seeded growth enhances the size of crystals. The crystals grown in the system are single crystal platelets exhibiting squarish or octagonal facets. Some crystals exhibit a spherulitic morphology.

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## Abstract Lead bromide crystals of high optical perfection and of different habits have been grown in silica gel by new gel technique starting from colloidal lead tartrate and KBr solution. pH is found to be not a factor for habit modification. Certain habits of the grown crystals exhibit interes