Thermal expansion of fluorapatite-hydroxylapatite crystalline solutions

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Abstract: Fluorapatite has been synthesized through ion-exchange between NIST hydroxylapatite SRM 2910a and optical-grade fluorite. The latter end-member and additional intermediate F-OH apatite samples made through ion-exchange between the newly synthesized fluorapatite and the original hydroxylapatite have provided materials for an investigation of thermal expansion in the F-OH apatite system. Unit-cell volumes determined from X-ray powder diffraction data collected between 22 and 928 °C have been utilized to compute the coefficients of thermal expansion at a pressure of 1 bar for seven apatite samples having various F:OH ratios, as well as for natural samples of fluorapatite and hydroxylapatite. Results show that the thermal expansion coefficient for volume averages 41.0 ± 1.4 (1σ) × 10-6 deg-1 for all samples and is thus little affected by F:OH ratio. This study extends the thermodynamic characterization of this important mineral system, with potential applications for the geological, planetary, biological, medical, and materials-science communities.

Location: Deutsche Nationalbibliothek Frankfurt am Main

Extent: Online-Ressource

Language: Englisch

Bibliographic citation: Thermal expansion of fluorapatite-hydroxylapatite crystalline solutions ; volume:99 ; number:11-12 ; year:2014 ; pages:2171-2175 ; extent:5
American mineralogist ; 99, Heft 11-12 (2014), 2171-2175 (gesamt 5)

Creator: Hovis, Guy L.
Scott, Brian T.
Altomare, Caitlin M.
Leaman, Amanda R.
Morris, Matthew D.
Tomaino, Gary P.
McCubbin, Francis M.

DOI: 10.2138/am-2014-4914

URN: urn:nbn:de:101:1-2404181809208.090906778827

Rights: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.

Last update: 14.08.2025, 11:01 AM CEST

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Hovis, Guy L.
Scott, Brian T.
Altomare, Caitlin M.
Leaman, Amanda R.
Morris, Matthew D.
Tomaino, Gary P.
McCubbin, Francis M.

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Thermal expansion of fluorapatite-hydroxylapatite crystalline solutions

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