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Growth of lanthanum heptamolybdate crystals by gel technique
Author(s) -
Bhat Sushma,
Kotru P. N.
Publication year - 1994
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.2170290306
Subject(s) - lanthanum , crystallization , crystal growth , crystallography , materials science , crystal (programming language) , diffusion , ion , inorganic chemistry , chemistry , organic chemistry , physics , computer science , thermodynamics , programming language
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 MoO 3 NH 4 OHHNO 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.