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Single-crystal X-ray diffraction of fluorapatite to 61 GPa

Journal Article · · American Mineralogist
DOI:https://doi.org/10.2138/am-2022-8410· OSTI ID:1969349
 [1];  [2];  [3];  [4];  [2]
  1. Princeton Univ., NJ (United States); Institute for Shock Physics, Washington State University
  2. Princeton Univ., NJ (United States)
  3. Univ. of Hawaii, Honolulu, HI (United States); Univ. of Chicago, IL (United States)
  4. Univ. of Hawaii, Honolulu, HI (United States)
+ Show Author Affiliations
Apatite is a mineral of widespread importance in Earth and planetary science. Here we examine the behavior of a natural fluorapatite (FAp) crystal from Durango (Mexico) under compression to 61 GPa. Single-crystal X-ray diffraction experiments were carried out in a diamond-anvil cell using a synchrotron source. The apatite structure persists up to 32.4 GPa. Birch-Murnaghan equation of state parameters were fit to the pressure-volume data for fluorapatite for two cases: fixing V0 at its measured ambient value resulted in a bulk modulus, K0T, of 97.0(8) GPa and a pressure derivative of the bulk modulus, K'0T, of 3.3(1), while fixing V0 and K0T at its ambient value 90.5 GPa (derived from ultrasonically measured elastic constants) resulted in a K'0T value of 4.1(1). At 35.6 GPa, fluorapatite transforms to a triclinic phase (P$$\bar{1}$$, Z = 4), designated here as fluorapatite II (FAp-II). This phase persists up to at least 61 GPa. The major structural differences between FAp and FAp-II involve the buckling of the Ca polyhedra along the c-axis and changes in the number and coordination of the Ca sites. Furthermore, our study extends the pressure range over which fluorapatite has been examined by more than a factor of three, providing new insights into its structural response to high-pressure conditions.
Research Organization:
Washington State Univ., Pullman, WA (United States). Inst. for Shock Physics
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)
Grant/Contract Number:
NA0003957
OSTI ID:
1969349
Journal Information:
American Mineralogist, Journal Name: American Mineralogist Journal Issue: 4 Vol. 108; ISSN 0003-004X
Publisher:
Mineralogical Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English

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