Crystal structure and EPR study of Mn-doped {beta}-tricalcium phosphate

Journal Article · Tue Feb 05 04:00:00 EST 2008 · Materials Research Bulletin

DOI:https://doi.org/10.1016/j.materresbull.2007.02.031· OSTI ID:21068205

Cohen, S; Gdalya, S ^[1]; Burghaus, O; Reinen, D ^[2]

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1. Department of Inorganic and Analytical Chemistry, Hebrew University, Jerusalem 91904 (Israel)
2. Fachbereich Chemie and Zentrum fuer Materialwissenschaften, Philipps Universitaet, 35032 Marburg (Germany)

Mn-doped {beta}-tricalcium phosphate was prepared by solid state reaction at 1100 deg. C. The crystal structure of Ca{sub 2.85}Mn{sub 0.15}(PO{sub 4}){sub 2}, was determined by single crystal X-ray diffraction and found to be rhombohedral, R3c. Unit cell parameters are: a = 10.3419(3); c = 37.025(3) A (hexagonal setting), Z = 21. Structure refinement data show that from the five Ca positions the Ca(4) site is only half filled and that the Mn{sup 2+} ions occupy the hexacoordinated Ca(5) site solely. EPR spectroscopy reveals that manganese in solid solutions Ca{sub 3-x}Mn{sub x}(PO{sub 4}){sub 2} (x = 0.1; 0.28; 0.6) is divalent and supports the structure refinement results that Mn occupies the Ca(5) site with a geometry very near to a regular octahedron.

• OSTI ID: 21068205
• Journal Information: Materials Research Bulletin, Journal Name: Materials Research Bulletin Journal Issue: 2 Vol. 43; ISSN MRBUAC; ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM PHOSPHATES
DOPED MATERIALS
ELECTRON SPIN RESONANCE
MANGANESE
MANGANESE IONS
MONOCRYSTALS
SOLID SOLUTIONS
SPECTROSCOPY
TRIGONAL LATTICES
X-RAY DIFFRACTION