Structure and radiation effect of Er-stuffed pyrochlore Er2(Ti2-xErx)O7-x/2 (x=0-0.667)

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:356

Article

Yang, D. Y.¹  Xu, C. P.¹  Fu, E. G.²  Wen, J.¹  Liu, C. G.¹  Zhang, K. Q.¹  Wang, Y. Q.³  Li, Y. H.¹ 

[1] Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 730000, Peoples R China

[2] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[3] Los Alamos Natl Lab, Div Mat Sci & Technol, Los Alamos, NM 87545 USA

关键词: Stuffed pyrochlore;    Ion irradiation;    Amorphization;    Lattice swelling;   

DOI  :  10.1016/j.nimb.2015.04.058

来源: Elsevier

【 摘 要 】

Er-stuffed pyrochlore series Er-2(Ti2-xErx)O7-x/2 (x = 0, 0.162, 0.286, 0.424 and 0.667) were synthesized using conventional ceramic processing procedures. The structure of Er-2(Ti2-xErx)O7-x/2 is effectively tailored by the Er stuffing level (x). In order to study the radiation effect of Er-stuffed pyrochlores, irradiation experiments were performed with 400 keV Ne2+ ions to fluences ranging from 5 x 10(14) to 3.0 x 10(15) ions/cm(2) at cryogenic condition. Irradiation induced microstructural evolution was examined using a grazing incidence X-ray diffraction technique. It is found that the irradiated layer of Er-2(Ti2-xErx)O7-x/2 undergoes significant lattice disordering and swelling at fluences of <= 1.5 x 10(15) ions/cm(2) and amorphization at fluences of >= 1.5 x 10(15) ions/cm(2). The radiation effect depends strongly on the chemical compositions of the samples. Both the lattice swelling percentage and the amorphous fraction decrease with increasing x. The experimental results are discussed in the context of cation antisite defect. The defect formation energy which varies as a function of x is responsible for the difference in the structural behaviors of Er-2(Ti2-xErx)O7-x/2 under 400 keV Ne2+ ion irradiation. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free