GROWTH OF LANTHANUM HEPTAMOLYBDATE CRYSTALS BY GEL TECHNIQUE

Authors
BHAT S KOTRU PN
Citation
S. Bhat et Pn. Kotru, GROWTH OF LANTHANUM HEPTAMOLYBDATE CRYSTALS BY GEL TECHNIQUE, Crystal research and technology, 29(3), 1994, pp. 325-333
Citations number
49
Categorie Soggetti
Crystallography
Journal title
Crystal research and technology → ACNP
ISSN journal
02321300
Volume
29
Issue
3
Year of publication
1994
Pages
325 - 333
Database
ISI
SICI code
0232-1300(1994)29:3<325:GOLHCB>2.0.ZU;2-H
Abstract
The growth of single crystals of lanthanum heptamolybdate is achieved by allowing controlled diffusion of La ions through silica gel using t he system La(NO3)3-MoO3-NH4OH-HNO3-Na2SiO3. The reaction mechanism lea ding to the growth is reported. Mechanism of crystallization of La hep tamolybdate is discussed. Formation of Liesegang rings consisting of L a heptamolybdate crystals in the system is reported. It is observed th at concentration programming and seeded growth enhances the size of cr ystals. The crystals grown in the system are single crystal platelets exhibiting squarish or octagonal facets. Some crystals exhibit a spher ulitic morphology.