PMID- 15017086
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20050113
LR  - 20070724
IS  - 0108-7681 (Print)
IS  - 0108-7681 (Linking)
VI  - 60
IP  - Pt 2
DP  - 2004 Apr
TI  - Calcium-lead fluoro-vanadinite apatites. II. Equilibrium structures.
PG  - 146-54
AB  - 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 nonstoichiometric, with lead preferentially favouring the larger AII 
      site at a partitioning coefficient kPb(AI/AII) approximately 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 AIO6 metaprism twist angle (phi) that 
      can be used to derive ideal cell parameters from triangular anion networks.
FAU - Dong, ZhiLi
AU  - Dong Z
AD  - Centre for Advanced Research of Ecomaterials, Institute of Environmental Science 
      and Engineering, Innovation Centre, Nanyang Technological University, Block 2, 
      Unit 237, 18 Nanyang Drive, Singapore 637723, Singapore. zldong@ntu.edu.sg
FAU - White, T J
AU  - White TJ
LA  - eng
PT  - Journal Article
DEP - 20040318
PL  - United States
TA  - Acta Crystallogr B
JT  - Acta crystallographica. Section B, Structural science
JID - 8403252
EDAT- 2004/03/16 05:00
MHDA- 2004/03/16 05:01
CRDT- 2004/03/16 05:00
PHST- 2003/11/27 00:00 [received]
PHST- 2004/01/24 00:00 [accepted]
PHST- 2004/03/16 05:00 [pubmed]
PHST- 2004/03/16 05:01 [medline]
PHST- 2004/03/16 05:00 [entrez]
AID - S0108768104001843 [pii]
AID - 10.1107/S0108768104001843 [doi]
PST - ppublish
SO  - Acta Crystallogr B. 2004 Apr;60(Pt 2):146-54. doi: 10.1107/S0108768104001843. 
      Epub 2004 Mar 18.