CHARACTERIZATION OF LANTHANUM HEPTAMOLYBDATE CRYSTALS GROWN FROM SILICA-GELS

Authors
BHAT S KOTRU PN
Citation
S. Bhat et Pn. Kotru, CHARACTERIZATION OF LANTHANUM HEPTAMOLYBDATE CRYSTALS GROWN FROM SILICA-GELS, Materials chemistry and physics, 39(2), 1994, pp. 118-123
Citations number
10
Categorie Soggetti
Material Science
Journal title
Materials chemistry and physics → ACNP
ISSN journal
02540584
Volume
39
Issue
2
Year of publication
1994
Pages
118 - 123
Database
ISI
SICI code
0254-0584(1994)39:2<118:COLHCG>2.0.ZU;2-8
Abstract
Crystals of lanthanum heptamolybdate grown from silica gel using the s ystem La(NO3)3-MoO3-NH4OH-HNO3-Na2SiO3 were characterized. The results of energy-dispersive X-ray analysis, X-ray and electron diffraction, infrared spectroscopy, and optical and scanning electron microscopy ar e reported. The composition of the crystals is established as La2Mo7O( 24)30H2O. The crystals exhibit varied morphologies, including square a nd octagonal platelets, cuboids, multifaceted crystals, coalesced and aggregated forms and spherulites. The spherulites are reported to have formed as a result of a large number of tiny crystallites becoming ad hered in a spherical envelope.