New insight in the structure–luminescence relationships of Ca9Eu(PO4)7 |
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| Authors: | Rajia Ait Benhamou Aurlie Bessire Gilles Wallez Bruno Viana Mohamed Elaatmani Mohamed Daoud Abdelwahed Zegzouti |
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| Institution: | aLaboratoire de Chimie de la Matière Condensée de Paris, CNRS-UMR7574, ENSCP-ParisTech, UPMC University, Paris 06, 11 rue Pierre et Marie Curie, 75231 Paris Cedex 05, France;bLaboratoire de la Matière Condensée et de l’Environnement, Université Cadi Ayyad, Faculté des Sciences-Semlalia, Marrakech, Morocco |
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| Abstract: | The double phosphate Ca9Eu(PO4)7, obtained by solid state reaction, was found to be isotypic with Ca3(PO4)2, with space group R3c and unit cell parameters a=10.4546(1) Å, c=37.4050(3) Å, V=3540.67(9) Å3, Z=6. The structure parameters refined using the Rietveld method showed that europium shares positions M1, M2 and M3 with calcium, contradicting previously published Mössbauer results. Low temperature luminescence under selective excitation of Eu3+ in Ca9Y1−xEux(PO4)7 and in Ca9Eu(PO4)7 samples was studied, confirming the Eu3+ distribution into these sites. At 10 K, 5D0→7F0 emission lines of Eu3+ were observed at 578.5, 579.5, 580.1 nm for the M3, M1 and M2 sites, respectively. High temperature X-ray powder diffraction evidenced a second-order phase transition around 573 °C. |
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| Keywords: | Calcium phosphate Crystal structure Luminescence Europium |
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