Structures of new triple phosphates Ca9CoМ(PO4)7 (M - Li, Na, K).

Authors

  • R.V. Lavryk National University of Life and Environmental Sciences of Ukraine image/svg+xml
  • D.D. Orekhova National University of Life and Environmental Sciences of Ukraine image/svg+xml

DOI:

https://doi.org/10.31548/bio2016.03.006

Abstract

New triple phosphates Ca9CoM(PO4)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 R3c) with unit-cell parameters a=10.327(1) Å, с=37.10(1) Å, M=Li; a=10.351(1) Å, с=37.073(1) Å, M =Na; a=10.401(1) Å, с=37.009(1) Å, M=K. Five independent cation sites are filled in Ca9CoM(PO4)7 (M=Li, Na, K). Cobalt occupies the octahedral site M(5), alkali metal cations occupy the M(4).

References

Dickens, B., Schroeder, L.W., Brown, W.E. (1994). The structures of phosphates. Journal Solid State Chemistry,10, 232–240.

Lazoryak, B.I. (2006). Synthesis of geterovalency. Russian Chemical Reviews, 65, 287.

https://doi.org/10.1070/RC1996v065n04ABEH000211

Nord, A.G., Miner, N.J. (1983). The structure of Ca3-xMex(PO4)2. Chemistry,11, 489.

Sheldrick, G.M. RIETAN-97. (1997). A program for crystal structure refinement. Release 97-2. University of Göttingend, Germany.

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Published

2017-05-11

Issue

Vol. 8 No. 3-4 (2016)

Section

Chemistry

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