Search and chemical modification of potential negative thermal expansion compounds

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Negative thermal expansion (NTE) compounds, which show volumetric contraction with increasing temperature, are important for application to nanotechnology. Then, a new NTE compound has been expected. In order to a guideline to search and develop the new NTE compounds, a method of chemical modification of potential NTE compounds to emerge the potential feature was investigated in the present study. The calorimetric investigation on ZrV2O7 and HfV2O7, which are the potential NTE compounds, indicated a structural difference between the NTE and the potential NTE compounds. The solid solution in A2B3O12 system exhibited the effects of substitution on the NTE feature. The electron microscopic observation of ZrW2O8, which is a famous NTE compound, and Sc-doped ZrW2O8 showed the importance of defects in lattice for the stability of the NTE property.