A novel route to synthesize cubic ZrW{sub 2-x}Mo{sub x}O{sub 8} (x=0-1.3) solid solutions and their negative thermal expansion properties

Cubic ZrW{sub 2-x}Mo{sub x}O{sub 8} (c-ZrW{sub 2-x}Mo{sub x}O{sub 8}) (x=0-1.3) solid solutions were prepared by a novel polymorphous precursor transition route. X-ray diffraction (XRD) analysis reveals that the solid solutions are single phase with {alpha}- and {beta}-ZrW{sub 2}O{sub 8} structure f...

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Bibliographic Details
Published inJournal of solid state chemistry Vol. 180; no. 11
Main Authors Zhao Ruiqi, Yang Xiaojing, Wang Huiliang, Han Jingsa, Ma Hui, Zhao Xinhua
Format Journal Article
LanguageEnglish
Published United States 15.11.2007
Subjects
CALORIMETRY
DIAGRAMS
INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY
LATTICE PARAMETERS
MOLYBDENUM COMPOUNDS
OXIDES
PHASE TRANSFORMATIONS
PRECURSOR
SOLID SOLUTIONS
SYNTHESIS
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
THERMAL EXPANSION
THERMAL GRAVIMETRIC ANALYSIS
TRANSITION TEMPERATURE
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION
ZIRCONIUM TUNGSTATES
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Summary:Cubic ZrW{sub 2-x}Mo{sub x}O{sub 8} (c-ZrW{sub 2-x}Mo{sub x}O{sub 8}) (x=0-1.3) solid solutions were prepared by a novel polymorphous precursor transition route. X-ray diffraction (XRD) analysis reveals that the solid solutions are single phase with {alpha}- and {beta}-ZrW{sub 2}O{sub 8} structure for 0{<=}x{<=}0.8 and 0.9{<=}x{<=}1.3, respectively. The optimum synthesis conditions of ZrWMoO{sub 8} are obtained from differential scanning calorimetry-thermal gravimetric analysis (DSC-TGA), XRD and mass loss-temperature/time curves. Following the above experience, the stoichiometric solid solutions of c-ZrW{sub 2-x}Mo{sub x}O{sub 8} (x=0-1) are obtained within 1 wt% of mass loss. The relationships of lattice parameters (a), phase transition temperatures (T{sub c}) and instantaneous coefficients of thermal expansion ({alpha}{sub i}) against the content x of Mo are discussed based on the variation of order degree parameters of ZrW{sub 2-x}Mo{sub x}O{sub 8}. - Graphical abstract: The trigonal precursor (a) is formed by calcining the dried coprecipitate of component oxides at 600 deg. C for 3 h. Through the trigonal precursor, cubic ZrWMoO{sub 8} (c) is synthesized at 913-950 deg. C for 1 h. According to the novel preparation route, a series of cubic ZrW{sub 2-x}Mo{sub x}O{sub 8} (x=0-1.3) are synthesized.
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2007.09.011