Radiation-Induced Effects and Valence Changes of Samarium Ions in Sr3Sm ( PO4 ) 3
Radiation-Induced Effects and Valence Changes of Samarium Ions in Sr3Sm ( PO4 ) 3
复制标题
Sr3Sm ( PO4 ) 3 中钐离子的辐射效应和价态变化
DOI：
10.1149/1.3153142
复制
发表时间：
2009
影响因子：
3.9
通讯作者：
H. Seo
中科院分区：
文献类型：
--
作者：
Yanlin Huang;Liang Shi;Xuebin Qiao;H. Seo
采用固相反应法合成了Sm 3+离子组成的三元正磷酸盐[Sr 3Sm（PO 4）3]。用X射线粉末衍射仪研究了样品的物相形成。钐离子可以以二价和三价两种形式存在。X射线辐照可引起Sm 3+ → Sm 2+的转变。通过光致发光和寿命测量对样品进行了研究。激发到4f 55 d1能级后，Sm 2+离子出现5D 0 → 7 Fj，（J = 0，1，2）发射和5d → 4f的宽带跃迁。Sm 2+离子的发光对温度敏感。随着温度的升高，Sm 2+离子的5d → 4f发射带出现并增强。在Ar +激光488 nm激发下，用光漂白法研究了X射线辐照产生的Sm 2+离子的稳定性。简要讨论了X射线辐照产生的缺陷。这些结果将有助于理解Sm 2+离子在Sm 3+富集基质中的还原机理。© 2009电化学学会。[DOI：10.1149/1.3153142]保留所有权利。
Ternary orthophosphate [Sr 3 Sm(PO 4 )3] with a stoichiometric component of Sm 3+ ion was prepared by a solid-state reaction. The phase formation of the sample was investigated by X-ray powder diffraction measurement. Samarium ions can be incorporated into two forms, divalent and trivalent. Exposure to X-ray irradiation can cause Sm 3+ → Sm 2+ conversion in this host. The samples were investigated by photoluminescence and lifetime measurements. After excitation into the 4f 5 5d 1 levels, the Sm 2+ ions showed 5 D 0 → 7 F j , (J = 0, 1, 2) emission together with the broad band of 5d → 4f transition. The luminescence of Sm 2+ ions was sensitive to the temperature. With increasing temperature, the luminescence intensity of 5d → 4f emission band of Sm 2+ ions appeared and got stronger. The stability of an Sm 2+ ions created by X-ray irradiation was investigated by photobleaching under excitation at 488 nm of Ar + laser. The defects created by X-ray irradiation were briefly discussed. These results would be helpful to understand the reduction mechanism of Sm 2+ ion in the Sm 3+ concentrated host. © 2009 The Electrochemical Society. [DOI: 10.1149/1.3153142] All rights reserved.