Nanocrystalline Growth Activation Energy of Zirconia Polymorphs Synthesized by Mechanochemical Technique
来源期刊：JOURNAL OF MATERIALS SCIENCE TECHNOLOG2014年第4期
论文作者：Jafar Javadpour Alireza Khav Massoud Goodarzi Hamid Reza Rezaie
文章页码：387 - 393
摘 要：The synthesis of ZrO2 by mechanochemical reaction using ZrCI4 and CaO as raw materials and subsequent annealing of the products were investigated.The effect of thermal treatment on the structural evolution and morphological characteristics of the nanopowders was studied by X-ray diffractometry,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy,differential thermal analysis and Rietveld refinement.The results showed that the average crystallite size of ZrO2 was less than 100 nm up to around1100 ℃.The activation energy for ZrO2 nanocrystallite growth during calcination was calculated to be about13,715 and 27,333 J/mol for tetragonal（t-ZrO2） and monoclinic（m-ZrO2） polymorphs,respectively.Mechanism of the nanocrystallite growth of the ZrO2 polymorphs during annealing is primarily investigated.
Jafar Javadpour2，Alireza Khav2，Massoud Goodarzi2，Hamid Reza Rezaie2
2. School of Metallurgy and Materials Engineering,Iran University of Science and Technology(IUST)
摘 要：The synthesis of ZrO2 by mechanochemical reaction using ZrCI4 and CaO as raw materials and subsequent annealing of the products were investigated.The effect of thermal treatment on the structural evolution and morphological characteristics of the nanopowders was studied by X-ray diffractometry,Raman spectroscopy,transmission electron microscopy,scanning electron microscopy,differential thermal analysis and Rietveld refinement.The results showed that the average crystallite size of ZrO2 was less than 100 nm up to around1100 ℃.The activation energy for ZrO2 nanocrystallite growth during calcination was calculated to be about13,715 and 27,333 J/mol for tetragonal（t-ZrO2） and monoclinic（m-ZrO2） polymorphs,respectively.Mechanism of the nanocrystallite growth of the ZrO2 polymorphs during annealing is primarily investigated.
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