The crystal chemistry of the alkaline-earth apatites A(10)(PO(4))(6)Cu(x)O(y)(H)(z) (A = Ca, Sr and Ba).
The crystal chemistry of the cuprate apatites A(I)(4)A(II)(6)(PO(4))(6)Cu(x)O(y)(H)(z) (A = Ca, Sr and Ba) was investigated by powder X-ray (PXRD) and neutron diffraction (PND) and X-ray photoelectron spectroscopy (XPS). The refined crystal structures confirmed earlier X-ray diffraction studies that showed copper resides in the apatite channels and additionally, located hydrogen. For all materials copper is primarily divalent (Cu(2+)) but in the calcium and strontium analogues co-exists with minor Cu(3+). This is in contrast with a previous work where Cu(1+) and Cu(2+) were reported.
Baikie
Tom
T
School of Materials Science & Engineering, Nanyang Technological University, Singapore. tbaikie@ntu.edu.sg
Ng
George M H
GM
Madhavi
S
S
Pramana
Stevin S
SS
Blake
Kevin
K
Elcombe
Margaret
M
White
T J
TJ
D001031:Apatites / Q000737:chemistry*; D001464:Barium / Q000737:chemistry; D002118:Calcium / Q000737:chemistry; D003300:Copper / Q000737:chemistry; D018360:Crystallography, X-Ray; D008673:Metals, Alkaline Earth / Q000737:chemistry*; D008968:Molecular Conformation; D013324:Strontium / Q000737:chemistry; D014961:X-Ray Diffraction
D001031:Apatites; D008673:Metals, Alkaline Earth; D001464:Barium; D003300:Copper; D002118:Calcium; D013324:Strontium