The effects of radiation damage and annealing on the microstructure of a natural zircon observed by TDPAC
作者:
P. Lacentre,
M.C. Caracoche,
期刊:
Radiation Effects and Defects in Solids
(Taylor Available online 1994)
卷期:
Volume 129,
issue 3-4
页码: 181-191
ISSN:1042-0150
年代: 1994
DOI:10.1080/10420159408229017
出版商: Taylor & Francis Group
关键词: zircon;natural damage;thermal recovery;multi-stage processes;TDPAC technique
数据来源: Taylor
摘要:
The hyperfine interaction of a natural brazilian zircon sand was determined at zirconium sites between room temperature and 1393K by means of the time-differential perturbed-angular-correlations technique. Complementary measurements of x-ray diffraction, differential thermal analysis and density were also performed. It was found that the starting compound was an intermediate zircon of 4.62 g/cm3density consisting of a mixture of slightly disordered and highly defectuous materials in a ratio quite different from that determined for non brazilian zircons self irradiated by the same α-dose. Heating the sample resulted in the gradual recovery of the periodic crystalline structure in a two-stage process characterized by activation energies of 3.88 and 4.68 eV. An additional zirconium compound, for which an interpretation is proposed, was observed to be present in a low and nearly constant proportion up to 1393K, temperature at which it evidenced a reduction. A final measurement at RT revealed that this last change, as well as the second annealing stage, were of reversible nature.
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