Nanocrystalline Growth Activation Energy of Zirconia Polymorphs Synthesized by Mechanochemical Technique

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• 作者：Taghi Dallali Isfahani¹ ; ^{taghiisfahani@yahoo.com" class="auth_mail} ; Jafar Javadpour² ; Alireza Khavandi² ; Massoud Goodarzi² ; Hamid Reza Rezaie²
• 关键词：Zirconia nanoparticles ; Mechanochemical synthesis ; Characterization methods ; Activation energy ; Phase transformation
• 刊名：Journal of Materials Science & Technology
• 出版年：April, 2014
• 年：2014
• 卷：30
• 期：4
• 页码：387-393
• 全文大小：1404 K

文摘

The synthesis of ZrO₂ by mechanochemical reaction using ZrCl₄ 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聽nm up to around 1100聽掳C. The activation energy for ZrO₂ nanocrystallite growth during calcination was calculated to be about 13,715 and 27,333聽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.