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Understanding colorations in PbMoO 4 crystals through stoichiometric variations and annealing studies
Author(s) -
Tyagi M.,
Singh S. G.,
Singh A. K.,
Gadkari S. C.
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200925625
Subject(s) - stoichiometry , annealing (glass) , impurity , cationic polymerization , materials science , oxygen , crystallography , chemistry , chemical physics , analytical chemistry (journal) , mineralogy , metallurgy , environmental chemistry , organic chemistry , polymer chemistry
In this paper, we report on PbMoO 4 crystals grown from melts of controlled stoichiometric variations under different ambient conditions. It is observed that PbMoO 4 crystals of different shades not only differ in their impurity contents but their stoichiometries with regard to both cationic and anionic compositions could be different. Annealing studies in air/oxygen as well as in vacuum were carried out on the crystals for a better understanding of the defect centers responsible for the coloration. The role of nonstoichiometric giving rise to coloration is also described.