Optical Absorption (OA) and Thermally Stimulated Depolarization Currents (TSDC) in Brazilian amethyst

被引：7
|
作者：
Cortezao, SU [1 ]
Blak, AR [1 ]
机构：
[1] Univ Sao Paulo, Inst Fis, Dept Fis Nucl, BR-05315 Sao Carlos, SP, Brazil
来源：
RADIATION EFFECTS AND DEFECTS IN SOLIDS | 1998年 / 147卷 / 1-2期
关键词：
amethyst; natural quartz; colour centers; optical absorption; dipoles; thermally stimulated depolarization currents;
D O I：
10.1080/10420159808226381
中图分类号：
TL [原子能技术]; O571 [原子核物理学];
学科分类号：
0827 ; 082701 ;
摘要：
Amethyst species of Brazilian natural quartz were studied by means of Thermally Stimulated Depolarization Currents (TSDC) and Optical Absorption (OA). The absorption spectra show three main peaks in the visible region (10000, 18000 and 27500 cm(-1)) attributed to iron in different valence states. In the infrared region the bands at 3430 and 3580 cm(-1) indicate the presence of OH- centers. A change to yellowish colour is observed by heating the samples from 673 to 873 K. An increase in the absorption spectra in the ultraviolet region is then observed. The TSDC spectra show two bands at 235 and 275 K attributed to defects of dipolar origin. Thermal treatments between 673 and 873 K drastically reduce the two peaks that were related to substitutional Fe3+-interstitial H+ in two different configurations. This dipole was also correlated to the 18000 cm(-1) OA band.
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页码：1 / 10
页数：10
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