Synthesis and characterization of rhombohedral- and tetragonal-lanthanum oxyfluoride powders

Title
Synthesis and characterization of rhombohedral- and tetragonal-lanthanum oxyfluoride powders
Author(s)
정우식이민호우동찬
Keywords
LUMINESCENT PROPERTIES; CRYSTAL-STRUCTURE; PHASE-TRANSITION; NANOCRYSTALS; FLUORIDE; NONSTOICHIOMETRY; CONDUCTIVITY; FILMS; EU; ND
Issue Date
201303
Publisher
ELSEVIER SCI LTD
Citation
CERAMICS INTERNATIONAL, v.39, no.2, pp.1533 - 1538
Abstract
Rhombohedral- and tetragonal-lanthanum oxyfluoride (LaOF) powders were prepared by thermal decomposition of lanthanum(III) carbonate fluoride (LaFCO3) powders that had been obtained from boiling an aqueous solution containing lanthanum(III) salt, fluoride ion (F-), and urea. The conversion process of LaFCO3 to LaOF was monitored by thermogravimetry, powder X-ray diffraction, and F-19 magic-angle spinning nuclear magnetic resonance spectroscopy. The crystal structure (rhombohedral, tetragonal) of LaOF depended on the mole ratio of F- to La3+ ions in the preparation of LaFCO3, and tetragonal-LaOF was completely transformed into rhombohedral-LaOF at 1000 degrees C. The difference in crystal structures was reflected in the intensity of the D-5(0) -> F-7(0) transition peak in the luminescence spectra of Eu3+-doped LaOF powders. (C) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/26246http://dx.doi.org/10.1016/j.ceramint.2012.07.103
ISSN
0272-8842
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공과대학 > 화학공학부 > Articles
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