The synthesis and crystal structure of CaAlFSiO4 , the Al-F analog of titanite
Aluminum-rich titanites [Ca(Ti,Al)(O,F)SiO4] with X(Al) > 0.53 [X(Al)=Al/(Al+Ti)], including the pure end-member CaAlFSiO4, were synthesized for the first time in a high-pressure experimental study. The crystal structure of CaAlFSiO4 was determined by Rietveld analysis of an X-ray powder diffraction pattern. CaAlFSiO4 is monoclinic, belongs to the space group A2/a, and has the unit-cell dimensions a = 6.9149(2) Å, b = 8.5064(1) Å, c = 6.4384(2) Å, and β = 114.684(2)°. The unit-cell volume is...[Show more]
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