Heavy-ion irradiation effects on structures and acid dissolution of pyrochlores

被引：105

作者：

Begg, BD ^{[1
]}

Hess, NJ ^{[1
]}

Weber, WJ ^{[1
]}

Devanathan, R ^{[1
]}

Icenhower, JP ^{[1
]}

Thevuthasan, S ^{[1
]}

McGrail, BP ^{[1
]}

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

来源：

JOURNAL OF NUCLEAR MATERIALS | 2001年 / 288卷 / 2-3期

关键词：

D O I：

10.1016/S0022-3115(00)00708-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependence of the critical dose for amorphization, using 0.6 MeV Bi+ ions, for A(2)Ti(2)O(7) pyrochlores, in which A=Y, Sm, Gd and Lu, exhibits no significant effect of A-site ion mass or size. The room temperature dose for amorphization was found to be similar to0.18 dpa in each case. After irradiation with 2 MeV Au2+ ions glancing-incidence X-ray diffraction (XRD) revealed that each pyrochlore underwent an irradiation-induced structural transformation to fluorite in conjunction with amorphization. The effect of amorphization on the dissolution rates of fully dense pyrochlores, at 90 degreesC and pH 2 (nitric acid) varied from a factor of 10 to 15 increase for Gd2Ti2O7 to none for Y2Ti2O7 Significant differences were observed in the A-site dissolution rates from the crystalline pyrochlores, indicating differences in the manner in which the A-site cations are incorporated into the pyrochlore structure. These indications were supported by Raman spectroscopy. Crown Copyright (C) 2001 Published by Elsevier Science B.V. All rights reserved.

引用

页码：208 / 216

页数：9

共 14 条

[11] ION-BEAM MODIFICATION OF GD2TI2O7 [J].