Crystal growth, characterization and spectroscopic study of europium-doped NaY(PO3)4 |
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| Authors: | F Khlissa M Frid MC Pujol X Mateos JJ Carvajal F Díaz M Aguil |
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| Institution: | aUnité de Matériaux de Terres Rares, Centre National de Recherches en Sciences des Matériaux, BP 95, 2050 Hammam-Lif, Tunisia;bFísica i Cristal·lografia de Materials i Nanomaterials (FiCMA-FiCNA), Universitat Rovira i Virgili (URV), c/Marcel·lí Domingo s/n, Campus Sescelades, E-43007 Tarragona, Spain |
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| Abstract: | Europium-doped NaY(PO3)4 single crystals have been synthesized by the flux method with sizes around 1 mm3. The unit cell parameters at room temperature refined by X-ray powder diffraction are a=7.1510(4) Å; b=13.0070(8) Å; c=9.6973(2) Å; β=90.606(3)°, Z=4 with the space group P21/n in monoclinic system. The present single crystals have a needle shape, they are elongated along the a crystallographic direction, and their size is in the 500 μm–1 mm range. The linear thermal expansion tensor parameters were determined, being the maximum value along the b direction, 16.1×10−6 K−1 and the minimum along the a direction being 11.7×10−6 K−1. The IR vibration modes attributed to the group P–O are consistent with the crystallographic data concerning the chain aspect of the phosphate anion. This material melts incongruently at 1141 K. Intense visible emissions attributed to Eu3+ 5D0→7F1, 5D0→7F2 and 5D0→7F4, electronic transitions have been observed after pumping at 355 nm at room temperature. |
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| Keywords: | A1 Doping A2 Growth from solution B1 Phosphate B1 Rare earth compounds B2 Photoluminescence |
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