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Growth and the Actual Compositions of Cation‐Deficient Sodium‐Gadolinium Molybdate Single Crystals
Author(s) -
Zharikov Evgeny V.,
Subbotin Kirill A.,
Titov Anatoly I.,
Lis Denis A.,
Voronov Valery V.,
Senin Valery G.,
Dudnikova Valentina B.
Publication year - 2020
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.201900238
Subject(s) - sodium molybdate , stoichiometry , gadolinium , molybdate , electron microprobe , chemistry , analytical chemistry (journal) , sodium , crystallography , homogeneity (statistics) , microprobe , materials science , mineralogy , inorganic chemistry , chromatography , statistics , mathematics , organic chemistry
The concentration series of sodium‐gadolinium molybdate (NGM) crystals have been grown by Czochralski technique from stoichiometric Na 0,5 Gd 0,5 MoO 4 melt, and from seven different nonstoichiometric melts in various atmospheres. The actual cation compositions of the crystals are measured by microprobe analysis. The location of the congruently melting composition is found for this compound, and the homogeneity field is evaluated. The unit cell parameters of the crystals have been calculated from X‐ray diffraction (XRD) analysis results. Hydrostatic densities of the crystals are measured. Based on these results, the actual molar weights of the samples are calculated that allows more precise determination of the crystals compositions. The studied crystals are shown to contain substantial sodium deficiency and excess of gadolinium compared to stoichiometry. The amount of cation vacancies occurs in both sublattices along with increase of Gd 2 O 3 /Na 2 O molar ratio in the crystals.