AMORPHIZATION OF ZIRCONOLITE - ALPHA-DECAY EVENT DAMAGE VERSUS KRYPTON ION IRRADIATION

被引：62

作者：

EWING, RC

WANG, LM

机构：

[1] Department of Geology, University of New Mexico, Albuquerque

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS | 1992年 / 65卷 / 1-4期

基金：

美国国家航空航天局; 美国国家科学基金会;

关键词：

D O I：

10.1016/0168-583X(92)95059-Z

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Natural zirconolite (CaZrTi2O7) can receive alpha-decay event doses of > 10(26) alpha-decay events/m3 (approximately 2 dpa), and can thus become amorphous (metamict) due to the radioactive decay of U-238, U-235 and Th-232 and their daughter products which occur as substitutional impurities (the zirconolite contains approximately 20 wt% ThO2 and is 550 million years old). In this study, the zirconolite sample was recrystallized by thermal annealing at 1130-degrees-C for 8 hours in air. Amorphization was induced with 1.5 MeV Kr+ ions using the HVEM-Tandem Facility at Argonne National Laboratory. The Kr dose rate used during the irradiation was 3.4 x 10(11) ions/cm2s, which is a damage rate 2 x 10(12) times higher than that which has occurred in the natural sample due to decay of the actinides. In-situ transmission electron microscopy was completed during the ion irradiation. The recrystallized zirconolite also formed isolated thorianite (ThO2) crystals, 25-100 nm in size, in the matrix of the polycrystalline zirconolite. After a Kr+ dose of 4 x 10(14) ions/cm2 (= 0.3 dpa), the zirconolite grains were reamorphized; however, the thorianite grains remained crystalline even after a Kr+ dose of 6 x 10(14) ions/cm2.

引用

页码：319 / 323

页数：5

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