Calcium-lead fluoro-vanadinite apatites. II. Equilibrium structures.

@article{Dong2004CalciumleadFA,
  title={Calcium-lead fluoro-vanadinite apatites. II. Equilibrium structures.},
  author={ZhiLi Dong and Timothy J. White},
  journal={Acta crystallographica. Section B, Structural science},
  year={2004},
  volume={60 Pt 2},
  pages={146-54}
}
The synthetic vanadinites (Pb(x)Ca(10-x))(VO4)6(F(1-2y)O(y) (y))2, 0.57 < x < 9 and 0.10 < y < 0.47, adopt the P6(3)/m apatite structure with 9.7835 (3) < or = a < or = 10.0531 (1) A and 7.0318 (2) < or = c < or = 7.3033 (1) A. The calcium endmember is monoclinic, space group P2(1)/m, with a = 9.7370 (3), b = 9.7358 (4), c = 7.00572 (9) A, gamma = 120.002 (5) degrees. For mixed metal compounds (x not equal to 0) the partitioning of calcium and lead over the AI(4f) and AII(6h) positions is… CONTINUE READING