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

Journal Article · Thu Nov 15 00:00:00 EST 2007 · Journal of Solid State Chemistry

DOI:https://doi.org/10.1016/j.jssc.2007.09.011· OSTI ID:21043739

Ruiqi, Zhao; Xiaojing, Yang; Huiliang, Wang; Jingsa, Han ^[1]; Hui, Ma ^[2]

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1. College of Chemistry, Beijing Normal University, 100875 (China)
2. Analyzing and Testing Center, Beijing Normal University, 100875 (China)

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.

• OSTI ID: 21043739
• Journal Information: Journal of Solid State Chemistry, Vol. 180, Issue 11; Other Information: DOI: 10.1016/j.jssc.2007.09.011; PII: S0022-4596(07)00382-9; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CALORIMETRY
DIAGRAMS
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