Annealing-Induced {011}-Specific Cyclic Twins in Tetragonal Zirconia Nanoparticles

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• 作者：Wentao Hu ; Shaocun Liu ; Yang Zhang ; Jianyong Xiang ; Fusheng Wen ; Bo Xu ; Julong He ; Dongli Yu ; Yongjun Tian ; Zhongyuan Liu
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：October 4, 2012
• 年：2012
• 卷：116
• 期：39
• 页码：21052-21058
• 全文大小：441K
• 年卷期：v.116,no.39(October 4, 2012)
• ISSN：1932-7455

文摘

Zirconia (ZrO₂) nanocrystals with average size of 4 nm are fabricated by oxidation of the nonstoichiometric ZrC_0.6 with ordered carbon vacancies at 450 掳C under atmosphere. The nanocrystals are predominantly tetragonal (t) phase and spherical in shape, and their exposed surfaces are constructed by the {011} and {001} facets. After annealing at 700 掳C under atmosphere, the coalescence of adjacent t-ZrO₂ nanocrystals is observed, and most of the annealed t-ZrO₂ nanoparticles are found to exhibit the {011}-specific twins. The dominant cyclic twins as well as a small number of the single and lamellar twins are recognized in the twinned nanoparticles. The cyclic-twinned nanoparticles are identified to have the 5-fold symmetry of either decahedron or icosahedron. In contrast to the single and lamellar twins which are formed via the coalescence of adjacent nanocrystals on the well-developed {011} surfaces, the cyclic-twinned nanoparticles are developed from the coalescence on the disoriented contact surfaces, in which the emission of partial dislocations and induced deformation are recognized to play the key role.