Growth and Characterization of Pure Gd-Heptamolybdate and Mixed Gd-Ba-Molybdate Crystals

Autor:	Sanjay Pandita, K. K. Bamzai, P. N. Kotru, Neera Sahni, Vinay Hangloo
Rok vydání:	2003
Předmět:	Chemistry Stoichiometric composition Inorganic chemistry Infrared spectroscopy General Chemistry Molybdate Condensed Matter Physics Ferroelectricity Faceting Crystallography chemistry.chemical_compound Water of crystallization General Materials Science Crystal twinning Sol-gel
Zdroj:	Crystal Growth & Design. 3:753-759
ISSN:	1528-7505 1528-7483
DOI:	10.1021/cg020042u
Popis:	The growth of pure Gd- and mixed Gd-Ba-molybdate crystals, bearing the stoichiometric composition Gd2Mo7O24·xH2O and Gd2Ba24Mo42O153, is achieved by the gel technique, using the system RCl3−(NH4)6Mo7O24−NH4NO3−HNO3−Na2SiO3 (where R = Gd, Gd:Ba). Addition of Ba in the lattice of pure Gd-heptamolybdate influences the morphological developments of grown crystals. While pure Gd-heptamolybdate assumes a spherulitic morphology under all conditions of growth, the addition of Ba modifies the morphology of mixed crystals drastically and develops them as well-facetted pyramidal twinned crystals. The mixed crystals do not carry any water of hydration and are thermally more stable as compared to pure Gd-heptamolybdate carrying water of hydration.
Databáze:	OpenAIRE
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