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Title: Thermal expansion in the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8}

Abstract

The thermal expansion of the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8} has been measured using neutron powder diffraction from 4.6 to 410 K, where it transforms to the cubic {alpha} phase. At low temperature, {gamma}-ZrW{sub 2}O{sub 8} has a negative thermal expansion, but the thermal expansion becomes less negative with increasing temperature and is slightly positive at room temperature. This behavior can be explained in terms of the contributing phonon modes: At low temperature, the vibrational modes lead to a negative thermal expansion, but additional modes that become active upon increasing temperature add positive contributions. Above room temperature, the a and b axes increase more sharply while the c axis reverses its behavior and decreases with increasing temperature. This unusual behavior can be explained in terms of a thermally activated process, presumed to result from oxygen-atom migration, that makes an additional contribution to the thermal expansion. (c) 1999 The American Physical Society.

Authors:
 [1];  [2];  [2];  [3];  [3];  [4]
  1. Department of Chemistry, University Science Laboratories, University of Durham, South Road, Durham, DH1 3LE, (United Kingdom)
  2. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  3. ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, (United Kingdom)
  4. Department of Chemistry and Center for Advance Materials Research, Oregon State University, Corvallis, Oregon 97331 (United States)
Publication Date:
OSTI Identifier:
20217941
Resource Type:
Journal Article
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 60; Journal Issue: 21; Other Information: PBD: 1 Dec 1999; Journal ID: ISSN 1098-0121
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THERMAL EXPANSION; ORTHORHOMBIC LATTICES; ZIRCONIUM OXIDES; TUNGSTEN OXIDES; NEUTRON DIFFRACTION; POWDER METALLURGY; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0000-0013 K; TEMPERATURE RANGE 0013-0065 K; TEMPERATURE RANGE 0065-0273 K; TEMPERATURE RANGE 0273-0400 K; VIBRATIONAL STATES; EXPERIMENTAL DATA

Citation Formats

Evans, J S. O., Jorgensen, J D, Short, S, David, W I. F., Ibberson, R M, and Sleight, A W. Thermal expansion in the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8}. United States: N. p., 1999. Web. doi:10.1103/PhysRevB.60.14643.
Evans, J S. O., Jorgensen, J D, Short, S, David, W I. F., Ibberson, R M, & Sleight, A W. Thermal expansion in the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8}. United States. https://doi.org/10.1103/PhysRevB.60.14643
Evans, J S. O., Jorgensen, J D, Short, S, David, W I. F., Ibberson, R M, and Sleight, A W. 1999. "Thermal expansion in the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8}". United States. https://doi.org/10.1103/PhysRevB.60.14643.
@article{osti_20217941,
title = {Thermal expansion in the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8}},
author = {Evans, J S. O. and Jorgensen, J D and Short, S and David, W I. F. and Ibberson, R M and Sleight, A W},
abstractNote = {The thermal expansion of the orthorhombic {gamma} phase of ZrW{sub 2}O{sub 8} has been measured using neutron powder diffraction from 4.6 to 410 K, where it transforms to the cubic {alpha} phase. At low temperature, {gamma}-ZrW{sub 2}O{sub 8} has a negative thermal expansion, but the thermal expansion becomes less negative with increasing temperature and is slightly positive at room temperature. This behavior can be explained in terms of the contributing phonon modes: At low temperature, the vibrational modes lead to a negative thermal expansion, but additional modes that become active upon increasing temperature add positive contributions. Above room temperature, the a and b axes increase more sharply while the c axis reverses its behavior and decreases with increasing temperature. This unusual behavior can be explained in terms of a thermally activated process, presumed to result from oxygen-atom migration, that makes an additional contribution to the thermal expansion. (c) 1999 The American Physical Society.},
doi = {10.1103/PhysRevB.60.14643},
url = {https://www.osti.gov/biblio/20217941}, journal = {Physical Review. B, Condensed Matter and Materials Physics},
issn = {1098-0121},
number = 21,
volume = 60,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 1999},
month = {Wed Dec 01 00:00:00 EST 1999}
}