Abstract
The effects of ball milling and subsequent annealing on the negative thermal expansion (NTE) properties of β-Cu1.8Zn0.2V2O7 were investigated. The NTE of β-Cu1.8Zn0.2V2O7 is generated by microstructural effects distinct to the ceramic body. Ball milling produces β-Cu1.8Zn0.2V2O7 particles about 1 μm in size, but the process degrades its NTE characteristics. Results show that subsequent annealing restores the NTE properties. By annealing at 500 °C, the absolute value of the negative coefficient of thermal expansion becomes greater than the crystallographic value, which indicates that the microstructures of β-Cu1.8Zn0.2V2O7 are not completely destroyed by ball milling. Ball milling used in combination with subsequent annealing may produce NTE β-Cu1.8Zn0.2V2O7 fine particles suitable for the control of thermal expansion in local regions.
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