Electron Irradiation Induced Phase-separation Behavior in AlF3 Doped Alumina Ceramic with Superior Sensitivity
文献类型：期刊论文
| 作者 | Shen Lu; Wang Dewen; Huang Rong; Du Shiyu; Huang Qing |
| 刊名 | JOURNAL OF INORGANIC MATERIALS
 |
| 出版日期 | 2021 |
| 卷号 | 36期号:1 |
| 关键词 | RADIATION-DAMAGE ALPHA-AL2O3 SURFACES BEAM DECOMPOSITION ENERGY SPINEL |
| 英文摘要 | An electron irradiation induced fast phase-separation behavior was observed under convention Transmission electron microscopy (TEM) observation of spark plasma sintered AlF3 doped alumina ceramic. Spherical nanocrystalline Al precipitates separated out from original alumina grain surface within several seconds under transmission electron microscopy electron irradiation. By high resolution TEM observation combined with diffraction patterns analysis, it was found that the original alumina grain surface was in highly defected state. After electron irradiation under TEM, the defects on original alumina surface vanished accompanied by the precipitation of nanocrystalline Al particles. By thoroughly analysis of the defect reaction during doping process and the feature of cation sub-lattice of alumina, a defect assisted interstitial atom segregation mechanism was proposed to explain this behavior. According to this mechanism, doped F ions first occupied oxygen vacancy sites with corresponding Al ions at intrinsic interstitial sites. After oxygen vacancies being fully occupied, both F and Al ions tended to settle down at intrinsic octahedron interstitial sites, which resulted in a metastable doping state. Under the act of 1/3 [1 (1) over bar 00] partial dislocation of alumina matrix, distorted cation sub-lattice generated double aggregated vacant octahedron sites. When these doublets vacant octahedron sites were occupied by foreign Al ions, stacking faults composed of about three sequences were generated as that observed in high resolution TEM. Meanwhile, the segregated doping Al ions at double aggregated octahedron sites along the stacking faults worked as early stage precipitations. Under electron irradiation, with the ablation of F ions, the unstable segregated Al ions separated out as nano precipitation with the reconstruction of alumina lattice. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/22276]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | Shen, L (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Shen Lu,Wang Dewen,Huang Rong,et al. Electron Irradiation Induced Phase-separation Behavior in AlF3 Doped Alumina Ceramic with Superior Sensitivity[J]. JOURNAL OF INORGANIC MATERIALS,2021,36(1). |
| APA | Shen Lu,Wang Dewen,Huang Rong,Du Shiyu,&Huang Qing.(2021).Electron Irradiation Induced Phase-separation Behavior in AlF3 Doped Alumina Ceramic with Superior Sensitivity.JOURNAL OF INORGANIC MATERIALS,36(1). |
| MLA | Shen Lu,et al."Electron Irradiation Induced Phase-separation Behavior in AlF3 Doped Alumina Ceramic with Superior Sensitivity".JOURNAL OF INORGANIC MATERIALS 36.1(2021). |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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