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Title: Polymorphism in yttrium molybdate Y{sub 2}Mo{sub 3}O{sub 12}

Abstract

Yttrium molybdate (Y{sub 2}Mo{sub 3}O{sub 12}) has been prepared by non-hydrolytic sol-gel chemistry. The phase evolution upon heating was investigated using in situ and ex situ heat treatments combined with powder X-ray diffraction. This method has led to the isolation of two orthorhombic phases with different atomic connectivity. Yttrium adopts 6- and 7-coordinate sites in the Pbcn and Pba2 structures, respectively. Cocrystallization of both phases was observed in a narrow temperature range, suggesting that crystallization kinetics play a major role in phase formation. It was found that the Pba2 phase is the stable polymorph below 550 deg. C, and converts to Pbcn at higher temperatures. - Graphical abstract: Yttrium molybdate (Y{sub 2}Mo{sub 3}O{sub 12}) prepared by non-hydrolytic sol-gel chemistry crystallizes in a mixture of orthorhombic polymorphs with different atomic connectivities. The Pbcn and Pba2 phases coexist over a narrow temperature range. Crystallization of the Pbcn structure is kinetically favored. The Pba2 polymorph is the thermodynamically stable phase at low temperatures, and converts to Pbcn above 550 deg. C.

Authors:
 [1];  [1]
  1. Department of Chemistry, University of Toledo, Toledo, OH 43606 (United States)
Publication Date:
OSTI Identifier:
21043781
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 180; Journal Issue: 12; Other Information: DOI: 10.1016/j.jssc.2007.10.011; PII: S0022-4596(07)00424-0; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; COORDINATES; CRYSTALLIZATION; HEAT TREATMENTS; HEATING; KINETICS; MIXTURES; MOLYBDATES; ORTHORHOMBIC LATTICES; SOL-GEL PROCESS; TEMPERATURE RANGE 0400-1000 K; X-RAY DIFFRACTION; YTTRIUM COMPOUNDS

Citation Formats

Gates, Stacy D, and Lind, Cora. Polymorphism in yttrium molybdate Y{sub 2}Mo{sub 3}O{sub 12}. United States: N. p., 2007. Web. doi:10.1016/j.jssc.2007.10.011.
Gates, Stacy D, & Lind, Cora. Polymorphism in yttrium molybdate Y{sub 2}Mo{sub 3}O{sub 12}. United States. https://doi.org/10.1016/j.jssc.2007.10.011
Gates, Stacy D, and Lind, Cora. 2007. "Polymorphism in yttrium molybdate Y{sub 2}Mo{sub 3}O{sub 12}". United States. https://doi.org/10.1016/j.jssc.2007.10.011.
@article{osti_21043781,
title = {Polymorphism in yttrium molybdate Y{sub 2}Mo{sub 3}O{sub 12}},
author = {Gates, Stacy D and Lind, Cora},
abstractNote = {Yttrium molybdate (Y{sub 2}Mo{sub 3}O{sub 12}) has been prepared by non-hydrolytic sol-gel chemistry. The phase evolution upon heating was investigated using in situ and ex situ heat treatments combined with powder X-ray diffraction. This method has led to the isolation of two orthorhombic phases with different atomic connectivity. Yttrium adopts 6- and 7-coordinate sites in the Pbcn and Pba2 structures, respectively. Cocrystallization of both phases was observed in a narrow temperature range, suggesting that crystallization kinetics play a major role in phase formation. It was found that the Pba2 phase is the stable polymorph below 550 deg. C, and converts to Pbcn at higher temperatures. - Graphical abstract: Yttrium molybdate (Y{sub 2}Mo{sub 3}O{sub 12}) prepared by non-hydrolytic sol-gel chemistry crystallizes in a mixture of orthorhombic polymorphs with different atomic connectivities. The Pbcn and Pba2 phases coexist over a narrow temperature range. Crystallization of the Pbcn structure is kinetically favored. The Pba2 polymorph is the thermodynamically stable phase at low temperatures, and converts to Pbcn above 550 deg. C.},
doi = {10.1016/j.jssc.2007.10.011},
url = {https://www.osti.gov/biblio/21043781}, journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 12,
volume = 180,
place = {United States},
year = {Sat Dec 15 00:00:00 EST 2007},
month = {Sat Dec 15 00:00:00 EST 2007}
}