Etude des phases β et haute pression du phosphate tricalcique par la RPE de l'ion Cu2+ |
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| Authors: | S.S. Romdhane G. Bacquet G. Bonel |
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| Affiliation: | Laboratoire de Chimie du Solide du CNRS, Universite´de Bordeaux I, 351 cours de la Libe´ration, 33405 Talence Cedex, France |
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| Abstract: | Copper (II)-doped powdered samples of β-Ca3(PO4)2 and of its high-pressure phase, which is an isotype of Ba3(VO4)2, were studied by ESR. In each case the RT spectrum is due to a unique type of defect exhibiting orthorhombic and respectively axial symmetry. The spin-Hamiltonian parameters were determined using the method proposed by Rollmann and Chan for polycrystalline specimens. The contribution of each of both copper isotopes was resolved with stressed samples. Our results show that isolated copper ions substitute preferentially for calcium in Ca(III) sites of β-calcium orthophosphate, these sites corresponding to those of Ca(I′) in the high-pressure phase. |
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