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

Dong ZL.; White TJ.

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

机译：钙铅氟钒钛磷灰石。二。平衡结构

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The synthetic vanadinites (PbxCa10-x)(VO4)(6)(F(1-2y)O(y)square(y))(2), 0.57 < x < 9 and 0.10 < y < 0.47, adopt the P6(3)/m apatite structure with 9.7835 (3) less than or equal to a less than or equal to 10.0531 (1) Angstrom and 7.0318 (2) less than or equal to c less than or equal to 7.3033 (1) Angstrom. The calcium endmember is monoclinic, space group P2(1)/m, with a = 9.7370 (3), b = 9.7358 (4), c = 7.00572 (9) Angstrom, gamma = 120.002 (5) degrees. For mixed metal compounds (x not equal 0) the partitioning of calcium and lead over the A(I)(4f) and A(II)(6h) positions is nonstoichiometric, with lead preferentially favouring the larger A(II) site at a partitioning coefficient k(Pb)(A(I)/A(II)) similar or equal to 0.33 for all x < 7. A miscibility gap exists for 2 < x < 3. Trends in crystallographic parameters can be correlated through consideration of the A(I)O(6) metaprism twist angle (φ) that can be used to derive ideal cell parameters from triangular anion networks. [References: 22]

机译：合成钒铁（PbxCa10-x）（VO4）（6）（F（1-2y）O（y）square（y））（2），0.57

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《Acta Crystallographica, Section B. Structural Science》 |2004年第2期|共9页
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Dong ZL.; White TJ.;
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正文语种 eng
中图分类晶体学;
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Solid-solutions; X-ray; Structure refinements; Hydroxyapatite; Phosphate; Radii;

机译：固溶体;X射线;结构细化;羟基磷灰石;磷酸盐;半径;

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

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