The crystal chemistry of the alkaline-earth apatites A_(10)(PO_4)_6Cu_xO_y(H)_z(A = Ca, Sr and Ba)

摘要

The crystal chemistry of the cuprate apatites 2,11,24"6(PO4)6Cu,0y(H), (A = Ca, Sr and Ba) wasinvestigated by powder X-ray (PXRD) and neutron diffraction (PND) and X-ray photoelectronspectroscopy (XPS). The refined crystal structures confirmed earlier X-ray diffraction studies thatshowed copper resides in the apatite channels and additionally, located hydrogen. For all materialscopper is primarily divalent (Cu") but in the calcium and strontium analogues co-exists with minorCu'. This is in contrast with a previous work where Cu' and Cu' were reported.