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Optical and structural characterisation of pure and Pr 3+ doped LaPO 4 and CePO 4 nanocrystals

Optical and structural characterisation of pure and Pr 3+ doped LaPO 4 and CePO 4 nanocrystals,10.1016/j.jallcom.2011.04.077,Journal of Alloys and Com

Optical and structural characterisation of pure and Pr 3+ doped LaPO 4 and CePO 4 nanocrystals  
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The rod- and stick-shaped nanocrystalline cerium and lanthanum orthophosphates, pure and Pr3+ doped, have been synthesised by the hydrothermal method in acidic (pH 1) or alkaline (pH 11) environment. Subsequent calcination of as-obtained powders at different temperatures, 500 and 900°C, led to the formation of hexagonal and monoclinic phases, respectively. The hexagonal phase at room temperature has been identified as hydrated orthophosphate with zeolite water inside the channels of the structure. The monoclinic phase is free of water.The average grain size is about 12–30nm depending on the calcination temperature and preparation conditions. The structural, morphological and optical (vibrational and luminescent) properties have been characterised and their changes due to the temperature and different acidity in the starting materials have been studied.
Journal: Journal of Alloys and Compounds - J ALLOYS COMPOUNDS , vol. 509, no. 27, pp. 7458-7465, 2011
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