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Hydrothermal Synthesis of ZrW 2−δ Mo δ O 8 (δ=0–0.91) and its α→β Transformation
Author(s) -
Ahmad Md. Imteyaz,
Lindley Kate,
Akinc Mufit
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04381.x
Subject(s) - molybdate , crystallite , differential scanning calorimetry , hydrothermal synthesis , tungstate , hydrothermal circulation , materials science , crystallography , transmission electron microscopy , fourier transform infrared spectroscopy , zirconium , scanning electron microscope , phase (matter) , monoclinic crystal system , analytical chemistry (journal) , mineralogy , chemistry , crystal structure , chemical engineering , nanotechnology , metallurgy , physics , organic chemistry , composite material , chromatography , thermodynamics , engineering
Phase pure, fine ZrW 2−δ Mo δ O 8 powders with 0.00≤δ≤0.91 were synthesized by a hydrothermal route. As‐synthesized particles exhibited a chemical composition consistent with zirconium tungstate–molybdate hydroxide dihydrate (Zr(W,Mo) 2 O 7 (OH) 2 ·2H 2 O). Transmission electron microscopy revealed a rod‐like morphology with each particle being a single crystal. X‐ray diffraction patterns revealed that the crystallite size as well as the disordered β phase increased with increasing Mo substitution for W. Fourier transform infrared spectroscopy showed characteristic stretching frequencies of Zr–O, (W,Mo)–O tetrahedral, as well as OH stretch. Differential scanning calorimetry showed that the order–disorder transition temperature decreases linearly with Mo content.