Site preference of cation vacancies in Mn-doped Ga2O3 with defective spinel structure

Site preference of cation vacancies in Mn-doped Ga2O3 with defective spinel structure
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尖晶石结构缺陷掺锰 Ga2O3 中阳离子空位的位点偏好

DOI:
10.1063/1.4770363
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发表时间:
2012-12
影响因子:
4
通讯作者:
Tanaka, Isao1, 2
Tanaka, Isao1, 2
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hayashi, Hiroyuki1;Huang, Rong2, 3;Oba, Fumiyasu1;Hirayama, Tsukasa2;Tanaka, Isao1, 2

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采用高角环形暗场扫描透射电子显微镜(HAADF-STEM)和第一性原理计算相结合的方法,揭示了Mn掺杂Ga 2 O3中具有缺陷尖晶石结构的本征阳离子空位的强择优性.强度轮廓分析的HAADF-STEM图像清楚地表明,阳离子空位更喜欢的八面体网站。系统的第一性原理计算698原子配置表明,锰离子和阳离子空位是积极有利的四面体和八面体网站,分别。发现阳离子空位的位置偏好与静电能相关。
A strong site preference of intrinsic cation vacancies in Mn-doped Ga2O3 with a defective spinel structure is revealed using a combination of high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) and first-principles calculations. The intensity profile analysis of HAADF-STEM images clearly indicates that the cation vacancies prefer the octahedral sites. Systematic first-principles calculations for 698 atomic configurations suggest that the Mn ions and cation vacancies are energetically favorable at the tetrahedral and octahedral sites, respectively. The site preference of the cation vacancies is found to correlate with the electrostatic energy.
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