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:
-
- 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}
}