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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The compounds MnTa2(P2O7)(3) (I), CaTa3(PO4)(P2O7)(3.5) (II), PbTa3(PO4)(P2O7)(3.5) (III), and SrTa3(PO4)(P2O7)(3.5) (IV) were prepared at 350-400degreesC from polyphosphoric acid melts containing tantalum and metal(II) cations, and their structures were studied. Binary phosphate I is isostructural to the earlier studied CoNb2(P2O7)(2). Compounds II-IV crystallized in the zirconium diphosphate crystal type. The charge of the cationic framework was balanced by diphosphate and monophosphate groups resulting in a rhombohedral distortion of the cubic unit cell. The unit cell parameters were a 15.385(9) Angstrom, b = 7.940(6) Angstrom, c = 6.484(4) Angstrom, beta = 90.6(3)degrees for I, a = 24.626(6) Angstrom, alpha = 90.08(6)degrees for I, a = 8.2395(6) Angstrom, alpha = 89.718(6)degrees for III, and a = 24.744(9) Angstrom, alpha = 90.07(6)degrees for IV. Crystal structure of III was determined; the IR spectra of the synthesized compounds were studied.