Resistance to amorphisation in Ca1-xLa2x/3TiO3 perovskites - a bulk ion-irradiation study
Resistance to amorphisation in Ca1-xLa2x/3TiO3 perovskites - a bulk ion-irradiation study
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Ca1-xLa2x/3TiO3 钙钛矿的抗非晶化性 - 一项体离子辐照研究
DOI：
10.1016/j.actamat.2019.09.006
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发表时间：
2019
期刊：
影响因子：
9.4
通讯作者：
Lawson S
中科院分区：
文献类型：
--
作者：
Lawson S
利用室温下1 MeV Kr+和5 MeV Au+离子辐照引起的变化，研究了阳离子空位对Ca1-xLa2x/3TiO3型钙钛矿结构陶瓷辐照损伤响应的影响。长期以来，钙钛矿体系一直被认为是处理鳗系元素废物的候选形式，而Pu等多价元素的掺杂可能会导致阳离子缺乏。根据X射线衍射和透射电子显微镜分析，证实了CaTiO_3的两个非晶化抗性/敏感区。观察到0.1 ≤ x ≤ 0.4的非晶化阻力增加，x ≥ 0.5的非晶化敏感性增加。这些过程被认为是由于0.1 ≤ x ≤ 0.4的辐射损伤恢复能力增强，以及x ≥ 0.5的无序耐受性降低/A-O键的共价性增加而引起的。X = 0和0.5样品的晶格参数分析表明，辐射损伤引起的体积膨胀饱和分别为4.7 ± 0.1%和1.8 ± 0.1%，但其饱和极限分别低于A和斜方晶系参数。在x = 0.2和0.4样品中，没有观察到非晶化，但发现b参数的膨胀程度小于a和c参数。离子辐照的x- ≥ -0.6样品未观察到溶胀现象。
The changes induced from 1 MeV Kr+and 5 MeV Au+ion irradiation at room temperature have been utilised to determine the impact of cation vacancies on the radiation damage response of bulk Ca1-xLa2x/3TiO3perovskite structured ceramics. Perovskite systems have long been considered as candidate waste forms for the disposition of actinide wastes, and doping with multi-valent elements such as Pu may lead to cation deficiency. Based on GAXRD and TEM analysis, two regions of resistance/susceptibility to amorphisation have been confirmed with reference to CaTiO3. Increased resistance to amorphisation has been observed for 0.1 ≤ x ≤ 0.4, with an increased susceptibility to amorphisation for x ≥ 0.5. It is proposed that these processes are induced by enhanced recovery from radiation damage for 0.1 ≤ x ≤ 0.4, and reduced tolerance for disorder/the increasingly covalent nature of the A-O bond for x ≥ 0.5. Lattice parameter analysis of the x = 0 and 0.5 samples showed a saturation in radiation damage induced volume swelling at 4.7 ± 0.1% and 1.8 ± 0.1%, respectively, while the saturation limit for thebparameter was lower than the respectiveaandcorthorhombic parameters. In the x = 0.2 and 0.4 samples, amorphisation was not observed, however thebparameter was found to swell to a lesser extent than theaandcparameters. Swelling was not observed for the ion irradiated x ≥ 0.6 samples.