Annealing-Induced {011}-Specific Cyclic Twins in Tetragonal Zirconia Nanoparticles
Annealing-Induced {011}-Specific Cyclic Twins in Tetragonal Zirconia Nanoparticles
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DOI：
10.1021/jp305881r
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发表时间：
2012-09
影响因子：
3.7
通讯作者：
Wentao Hu;Shaocun Liu;Yang Zhang;J. Xiang;F. Wen;Bo Xu;Julong He;D. Yu;Yongjun Tian;Zhongyuan Liu
中科院分区：
文献类型：
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作者：
Wentao Hu;Shaocun Liu;Yang Zhang;J. Xiang;F. Wen;Bo Xu;Julong He;D. Yu;Yongjun Tian;Zhongyuan Liu
平均尺寸为 4 nm 的氧化锆 (ZrO2) 纳米晶体是通过在 450 °C 大气下氧化具有有序碳空位的非化学计量 ZrC0.6 制备的。纳米晶体主要为四方 (t) 相且形状为球形，其暴露表面由 {011} 和 {001} 面构成。在大气中700℃退火后，观察到相邻t-ZrO2纳米晶体的聚结，并且发现大多数退火的t-ZrO2纳米颗粒表现出{011}特异性孪晶。在孪晶纳米粒子中可以识别出主要的循环孪晶以及少量的单孪晶和层状孪晶。循环孪生纳米粒子被鉴定为具有十面体或二十面体的五重对称性。与通过在发达的{011}表面上相邻纳米晶体的聚结而形成的单层和层状孪晶相比，循环孪生纳米颗粒是通过在混乱的接触表面上的聚结而形成的，在...
Zirconia (ZrO2) nanocrystals with average size of 4 nm are fabricated by oxidation of the nonstoichiometric ZrC0.6 with ordered carbon vacancies at 450 °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 °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...