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Mild hydrothermal synthesis and structures of mixed‐valence iron phosphates: SrFe 3 (PO 4 ) 3 and the interesting Mg 2+ ‐doped AFe 3 (PO 4 ) 3 (A = Ba, Pb) in Fe 2+ site
Author(s) -
Chen Yan
Publication year - 2012
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201200289
Subject(s) - isostructural , valence (chemistry) , hydrothermal synthesis , doping , crystal structure , hydrothermal circulation , crystallography , chemistry , inorganic chemistry , mineralogy , materials science , geology , optoelectronics , organic chemistry , seismology
Abstract Series of mixed valence monophosphates AFe 3‐x Mg x (PO 4 ) 3 [A = Sr(x = 0), Ba(x = 0.6), Pb(x = 0.6)] were synthesized by mild hydrothermal treatment at 210 °C. Refinements of single crystal X‐ray diffraction datas show all these compounds are isostructural. The attempts to make AFe 3 (PO 4 ) 3 (A = Ba, Pb) hydrothermally in the experiment were unsuccessful. However, the Mg‐doped homologues AFe 2.4 Mg 0.6 (PO 4 ) 3 (A = Ba, Pb) were synthesized with the addition of MgCO 3 in the reactants as mineralizer. EDS and single crystal X‐ray data refinement indicated that the Mg 2+ cations were doped in the Fe 2+ sites of AFe 2.4 Mg 0.6 (PO 4 ) 3 (A = Ba, Pb). The influence of the Mg‐doping on the structure and the reason why the Mg doped in the Fe(II) site instead of A site was discussed from the point of view of the bond valence model.