Abstract
New triple phosphates Ca 9Co M(PO 4) 7 ( M = Li, Na, K) were synthesized by solid state method. Their crystal structures were determined by Rietveld analysis. They are related to tricalcium phosphate and crystallize into trigonal system (space group R3 c) with unit-cell parameters a = 10.3276(1) Å, c = 37.100(1) Å, M = Li; a = 10.3515(1) Å, c = 37.073(1) Å, M = Na; a = 10.4017(1) Å, c = 37.009(1) Å, M = K. All five independent cation sites are filled in Ca 9Co M(PO 4) 7 ( M = Li, Na, K). Cobalt occupies the octahedral site M(5). Alkali metal cations occupy the M(4) site.
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