Abstract
We report the preparation of ZrWMoO8 and its composites with near zero thermal expansion property using in situ solid state reaction or co-precipitation route. The aim of this study is to compare the influence of the fabrication method on the structure and thermal expansion of the products. The composition of the obtained powders was characterized by X-ray diffraction (XRD) and thermal expansion property was investigated by Thermomechanical Analysis (TMA), respectively. The results indicate that the room temperature structure of ZrWMoO8 depends on the preparation method, and the structure can be indexed either as α-ZrW2O8 structure for in situ solid state reaction or as β-ZrW2O8 structure for co-precipitation route. The participation of the water in the reaction process was speculated to be the reason for the difference structure. However, no matter which structure ZrWMoO8 adopted, it exhibits excellent negative thermal expansion property and can be utilized to decrease the thermal expansion of ZrO2. The only difference is that the CTE curves of ZrO2 composites with ZrWMoO8 adopting α-ZrW2O8 structure have a discontinuity at about 150 °C due to the α–β phase transition while the other curves are linear.
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Acknowledgements
The authors thank the National Natural Science Foundation of China (No. 50772044) and Doctoral Fund of Ministry of Education of China (No. 200802990001).
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Liu, QQ., Cheng, XN., Yang, J. et al. Influence of fabrication method on the structure and thermal expansion property of ZrWMoO8 and its composites. J Mater Sci 46, 1253–1258 (2011). https://doi.org/10.1007/s10853-010-4905-6
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DOI: https://doi.org/10.1007/s10853-010-4905-6