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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 2018: 2.55

SCImago Journal Rank (SJR) 2018: 1.355
Source Normalized Impact per Paper (SNIP) 2018: 1.103

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1945-3027
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Volume 100, Issue 5-6

Issues

Thermal expansion of F-Cl apatite crystalline solutions

Guy Hovis
  • Corresponding author
  • Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
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/ Tony Abraham
  • Department of Earth Sciences, University of Cambridge, 10 Downing Street, Cambridge CB2 3EQ, U.K.
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/ William Hudacek
  • MAT Program, American Museum of Natural History, Central Park West at 79th Street, New York, New York 10024, U.S.A.
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/ Sarah Wildermuth / Brian Scott
  • Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
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/ Caitlin Altomare / Aaron Medford
  • School of Earth and Climate Sciences and Climate Change Institute, University of Maine, Orono, Maine 04469, U.S.A.
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/ Maricate Conlon / Matthew Morris
  • Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
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/ Amanda Leaman
  • Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
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/ Christine Almer
  • Department of Geology and Environmental Geosciences, Lafayette College, Easton, Pennsylvania 18042, U.S.A.
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/ Gary Tomaino / Daniel Harlov
Published Online: 2015-05-12 | DOI: https://doi.org/10.2138/am-2015-5176

Abstract

We have studied the thermal expansion of 15 synthetic and two natural F-Cl apatite solid solutions through the calculation of unit-cell dimensions at elevated temperatures based on X‑ray powder diffraction data collected from room temperature to ~900 °C at 50 to 100 °C intervals. Coefficients of thermal expansion for the a and c unit-cell axes show sensitivity to composition, with αa increasing by about 50% and αc decreasing by a third from chlorapatite to fluorapatite. Despite the relationships observed for a and c, the thermal expansion coefficient for unit-cell volume shows little sensitivity to composition, which can be explained only by a mutually compensating structural adjustment along the latter axes as temperature rises. Results of this study also imply that the thermodynamically ideal volumes of mixing for F-Cl apatite solid solutions observed at ambient conditions continue to at least 900 °C.

Keywords: Fluorapatite; chlorapatite; thermal expansion; thermodynamic properties

About the article

Received: 2014-08-26

Accepted: 2014-11-08

Published Online: 2015-05-12

Published in Print: 2015-05-01


Citation Information: American Mineralogist, Volume 100, Issue 5-6, Pages 1040–1046, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am-2015-5176.

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© 2015 by Walter de Gruyter Berlin/Boston. This work is licensed under the MSA License. (view license)

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