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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
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1945-3027
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Volume 101, Issue 9

Issues

Gaussian thermoluminescence in long-range disordered K-feldspar

Luis Sánchez-Muñoz / Javier García-Guinea / Peter D. Townsend
  • School of Engineering, University of Sussex, Brighton, United Kingdom of Great Britain and Northern Ireland
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Tjipto Juwono / Ana Cremades
  • Dipartment, Física de Materiales, Fac. Físicas, University Complex Madrid, 28040 Madrid, Spain
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
Published Online: 2016-09-01 | DOI: https://doi.org/10.2138/am-2016-5697

Abstract

The thermoluminescence behavior of long-range ordered crystals is usually explained by the band structure model, using first- and second-order kinetics. However, feldspars have order-disorder phenomena and twinning, and consequently these mathematical descriptions are not helpful in most cases. In this work, the thermally stimulated intrinsic blue luminescence at 440 nm from X-ray induced defects of the K-rich feldspars is used to show a progressive behavior change along the order-disorder series. It is observed a gradual conversion of the TL signal from a very asymmetric peak with exponential rise and power law decay in microcline and orthoclase, where a t coefficient in log-log plots decreases with twin/domain size, to a more symmetric signal in a partially disordered sanidine, up to reach a completely symmetric Gaussian peak in fully disordered sanidine. These results are compatible with the Bässler’s model of disorder, which suggest that atomic disorder involves the transformation of delocalized bands first into band tails as the source of electron traps, and later in localized density of states following a Gaussian distribution.

Keywords: K-feldspars; thermoluminescence; order-disorder series; density of states

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About the article

Received: 2016-01-29

Accepted: 2016-05-29

Published Online: 2016-09-01

Published in Print: 2016-09-01


Citation Information: American Mineralogist, Volume 101, Issue 9, Pages 2118–2122, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2016-5697.

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© 2016 by Walter de Gruyter Berlin/Boston.

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