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Crystal Structure Refinements of the Lead(II) Oxoarsenates(V) $Pb_{2}As_{2}O_{7}$, $Pb(H_{2}AsO_{4})_{2}$, $Pb_{5}(AsO_{4})_{3}$OH and $NaPb_{4}(AsO_{4})_{3}$ from Single-Crystal X-ray Data
| Content Provider | MDPI |
|---|---|
| Author | Weil, Matthias |
| Copyright Year | 2021 |
| Abstract | Single-crystals of lead(II) oxoarsenates(V) were grown from the melt (Pb2As2O7), from solution (Pb(H2AsO4)2 and Pb5(AsO4)3OH), and under hydrothermal conditions (NaPb4(AsO4)3). Crystal structure refinements from single-crystal X-ray diffraction data revealed isotypism for both Pb2As2O7 and Pb(H2AsO4)2 with the corresponding barium and phosphate phases. A quantitative comparison of the crystal structures showed a high similarity for the isotypic M2X2O7 structures (M = Pb, Ba; X = As, P), whereas for the M(H2XO4)2 structures only the pair Pb(H2AsO4)2 and Pb(H2PO4)2 is similar, but not Ba(H2AsO4)2. Pb5(AsO4)3OH adopts the apatite structure type in space group P63/m, with the hydroxyl group disordered around Wyckoff position 2 b (0, 0, 0) in the channels of the structure. NaPb4(AsO4)3 represents a lacunar apatite with two of the three metal positions occupationally disordered by Pb and Na. In contrast to a previous X-ray powder study of NaPb4(AsO4)3 that reported an apatite-type structure in space group P63/m, the current single-crystal data clearly revealed a symmetry reduction to space group P |
| Starting Page | 1156 |
| e-ISSN | 2075163X |
| DOI | 10.3390/min11111156 |
| Journal | Minerals |
| Issue Number | 11 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-10-20 |
| Access Restriction | Open |
| Subject Keyword | Minerals Lead Oxoarsenates Solid State Synthesis Hydrothermal Synthesis Crystal Chemistry Apatite Structure Type Belovite Structure Type Crystal Structure Comparison |
| Content Type | Text |
| Resource Type | Article |
