Abstract
It is well known that monoclinic ZrO2 nanocrystals can be synthesized at ~1000°C by sol–gel method. In this letter, we demonstrate a novel method to synthesize monoclinic ZrO2 nanocrystal through sol–gel technique under relatively lower calcined temperature. It is found that composition of monoclinic ZrO2 can be significantly enhanced by doping Li+, and pure monoclinic phase ZrO2 nanocrystals appear at 900°C, 800°C and 700°C for samples doped with 0.5, 2, and 5mol% Li+, respectively. This phase transformation of ZrO2 is dependent on the crystallite size and there is a range of around 11–35nm of crystallite size in which tetragonal and monoclinic ZrO2 coexist.
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