期刊
JOURNAL OF ALLOYS AND COMPOUNDS
卷 509, 期 27, 页码 7458-7465出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2011.04.077
关键词
Rare earth orthophosphates; Nanostructured materials; Hydrothermal synthesis; Optical properties
资金
- The Polish Ministry of Science and Higher Education [1 P03B 078 29]
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 degrees 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 12-30 nm 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. (C) 2011 Elsevier B.V. All rights reserved.
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