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Title: Pressure-dependence of the phase transitions and thermal expansion in zirconium and hafnium pyrovanadate

Abstract

Low or negative thermal expansion (NTE) has been previously observed in members of the ZrP 2O 7 family at temperatures higher than their order-disorder phase transitions. The thermoelastic properties and phase behavior of the low temperature superstructure and high temperature negative thermal expansion phases of ZrV 2O 7 and HfV 2O 7 were explored via in situ variable temperature/pressure powder x-ray diffraction measurements. The phase transition temperatures of ZrV 2O 7 and HfV 2O 7 exhibited a very strong dependence on pressure (~700 K GPa), with moderate compression suppressing the formation of their NTE phases below 513 K. Compression also reduced the magnitude of the coefficients of thermal expansion in both the positive and negative thermal expansion phases. Additionally, the high temperature NTE phase of ZrV 2O 7 was found to be twice as stiff as the low temperature positive thermal expansion superstructure (24 and 12 GPa respectively).

Authors:
; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1345410
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Solid State Chemistry; Journal Volume: 249; Journal Issue: C
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE

Citation Formats

Gallington, Leighanne C., Hester, Brett R., Kaplan, Benjamin S., and Wilkinson, Angus P. Pressure-dependence of the phase transitions and thermal expansion in zirconium and hafnium pyrovanadate. United States: N. p., 2017. Web. doi:10.1016/j.jssc.2017.02.014.
Gallington, Leighanne C., Hester, Brett R., Kaplan, Benjamin S., & Wilkinson, Angus P. Pressure-dependence of the phase transitions and thermal expansion in zirconium and hafnium pyrovanadate. United States. doi:10.1016/j.jssc.2017.02.014.
Gallington, Leighanne C., Hester, Brett R., Kaplan, Benjamin S., and Wilkinson, Angus P. Mon . "Pressure-dependence of the phase transitions and thermal expansion in zirconium and hafnium pyrovanadate". United States. doi:10.1016/j.jssc.2017.02.014.
@article{osti_1345410,
title = {Pressure-dependence of the phase transitions and thermal expansion in zirconium and hafnium pyrovanadate},
author = {Gallington, Leighanne C. and Hester, Brett R. and Kaplan, Benjamin S. and Wilkinson, Angus P.},
abstractNote = {Low or negative thermal expansion (NTE) has been previously observed in members of the ZrP2O7 family at temperatures higher than their order-disorder phase transitions. The thermoelastic properties and phase behavior of the low temperature superstructure and high temperature negative thermal expansion phases of ZrV2O7 and HfV2O7 were explored via in situ variable temperature/pressure powder x-ray diffraction measurements. The phase transition temperatures of ZrV2O7 and HfV2O7 exhibited a very strong dependence on pressure (~700 K GPa), with moderate compression suppressing the formation of their NTE phases below 513 K. Compression also reduced the magnitude of the coefficients of thermal expansion in both the positive and negative thermal expansion phases. Additionally, the high temperature NTE phase of ZrV2O7 was found to be twice as stiff as the low temperature positive thermal expansion superstructure (24 and 12 GPa respectively).},
doi = {10.1016/j.jssc.2017.02.014},
journal = {Journal of Solid State Chemistry},
number = C,
volume = 249,
place = {United States},
year = {Mon May 01 00:00:00 EDT 2017},
month = {Mon May 01 00:00:00 EDT 2017}
}