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Cubic HfW2−x V x O8−x/2 (c-HfW2−x V x O8−x/2) solid solutions, where x is up to 0.34, were synthesized using a process of acidic steam hydrothermal (ASH)-thermal dehydrating precursors. The process is studied detailedly. The results reveal tetragonal HfW2−x V x O7−x/2(OH)2(H2O)2 precursors are synthesized after ASH treatment and they produce orthorhombic HfW2−x V x O8−x/2 in dehydrating. Then c-HfW2−x V x O8−x/2 are obtained at higher temperature. The crystal structures of c-HfW2−x V x O8−x/2 are characterized as α-HfW2O8 and β-HfW2O8 structure for 0≤x≤0.30 and x=0.34, respectively. All the c-HfW2−x V x O8−x/2 show excellent negative thermal expansion property. The relationships between the properties, such as ordered degree parameter, crystal lattice parameter, phase transition temperature and linear average thermal expansion coefficient, and the V content are also discussed.
Graphical abstract
graphical abstract Highlights
Novel c-HfW2−x V x O8−x/2 solid solutions were synthesized and all of them still show excellent negative thermal expansion property.
| Authors: | Fuli Guo, Xi Chen, Xuebin Deng, Hui Ma, Xiaojing Yang, Xinhua Zhao | |
| Journal: | Journal of Solid State Chemistry | |
| Year: | 2012 | |
| DOI: | 10.1016/j.jssc.2012.05.040 | |
| Publication date: | 18-06-2012 |
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