Ion Irradiation Effects on Ho2+xTi2-xO7-x/2 (x=0,0.4 and 0.67)

摘要：

　　We recently synthesized different composition polycrystalline Ho2+xTi2-xO7-x/2 (x=0,0.4 and 0.67),which is derivative fluorite compounds known as α,β and pyrochlore phases in Ho3O2-TiO2 phase diagram by using conventional solid state synthesis methods.The samples were irradiated with 400 keV Ne2+ ions at cryogenic temperature (~77 K),using the Danfysik ion accelerator at the Ion Beam Materials Laboratory (IBML) of Los Alamos National Laboratory (LANL).The irradiation fluences in the experiments ranged from 5×1014-5×1015 ions/cm2.An order-to-disorder (O-D) transformation was observed for α,β and pyrochlore phases,as determined using grazing incidence X-ray diffraction (GIXRD) at an incident angle of 0.25°.The O-D transformation threshold fluence for α phase was found to be noticeably lower than those for β phase and pyrochlore,and the O-D transformation threshold fluence for β phase was the highest.The O-D transformation threshold fluence was found to be coherent with the phase transformation temperature in the Ho3O2-TiO2 temperature-composition (T-C) phase diagram.

关键词： Ho2+xTi2-xO7-x/2 Ion irradiation GIXRD Phase transformation

作者: Yuhong Li Yongqiang Wang Juan Wen Valdez.A.James Kurt E.Sickafus

作者单位: School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000,China Materials Science & Technology Division,Los Alamos National Laboratory,Los Alamos,NM 87545,USA

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 643-647

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）