Abstract
Little attention was paid to the effect of oxygen vacancy configuration, although it is well known that oxygen vacancy plays a key role in determining the electrical and optical properties of VO2. By means of different heat treatments, the oxygen vacancy configuration in VO1.965 nanometer ceramic is controlled and its behavior is investigated in detail. It is found that VO1.965 ceramic aged at 60°C for a day displays a new first order phase transformation at about 30°C, which is associated with the oxygen vacancy distribution. An explanation based on the symmetry conforming principle is tentatively presented.
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