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- W2382999441 abstract "The effects of heating temperature and duration time on the process of ZnO crystallization under the pressure of 5 GPa are studied systemically by the methods of X-ray diffraction(XRD) and scanning electron microscopy(SEM).The experimental results show that the diffusion rate of ZnO increases greatly under high-pressure and the sample density higher than 99% of the theoretical value can be achieved after heated at 400 ℃ and 5 GPa for 0.5 h.With the increasing of the heating temperature,micro-cracks develop along crystal boundary in all samples,and eventually ZnO powder mixed with single crystals and poly-crystals forms above 500 ℃.The pale yellow crystallites with an average size of 100 μm and the largest size more than 350 μm was obtained at 850 ℃ after heating of 5 min.The sample morphology analysis shows that the reason for the ultra fast crystallization of ZnO under high-pressure is possibly caused by a very quick diffusion rate of ZnO along certain direction.The crystal boundary along such direction moves very quickly under high-pressure until the neighboring micro-crystals merge into a single crystal in a short time,while the micro-crystals shrink in the other direction and cause micro-cracks along other crystal boundaries." @default.
- W2382999441 created "2016-06-24" @default.
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- W2382999441 date "2008-01-01" @default.
- W2382999441 modified "2023-09-25" @default.
- W2382999441 title "Possible Existence of Ultra Fast Polarity Diffusion Process of ZnO under High Pressure" @default.
- W2382999441 hasPublicationYear "2008" @default.
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