Preparation and thermal expansion of (M0.5IIIM′ 0.5V)P2O7 with the cubic ZrP 2O7 structure

Tamas Varga; Angus P. Wilkinson; Michael S. Haluska; E. Andrew Payzant

doi:10.1016/j.jssc.2005.09.006

Preparation and thermal expansion of (M_0.5^IIIM′ _0.5^V)P₂O₇ with the cubic ZrP ₂O₇ structure

Tamas Varga, Angus P. Wilkinson, Michael S. Haluska, E. Andrew Payzant

Materials Engineering

Research output: Contribution to journal › Article › peer-review

14 Scopus citations

Abstract

A series of compounds (M0.5IIIM′0.5V)P2O7, MIIIM′V=AlTa, FeTa, GaTa, InNb, YNb, NdTa, and BiTa that are close structural relatives of cubic ZrP₂O₇ were prepared. Annealing samples with MIIIM′V=InNb or YNb at temperatures above 600 °C did not lead to any long-range cation ordering. The thermal expansion characteristics of samples quenched from 1000 °C with MIIIM′V=AlTa, InNb and YNb were investigated by high-temperature powder diffraction over the temperature range 25-600 °C. There are no lattice constant discontinuities in this range, unlike ZrP₂O₇. (Al_0.5Ta_0.5)P ₂O₇ and (In_0.5Nb_0.5)P ₂O₇ show linear coefficients of thermal expansion (CTEs) of 11.5(2)×10^-6 and 11.8(2)×10^-6 K ^-1, respectively. These values are similar to that for the low-temperature ZrP₂O₇ structure. However, the linear CTE for (Y_0.5Nb_0.5)P₂O₇ (4.8(2)×10^-6 K^-1) is similar to that of the high-temperature form of ZrP₂O₇.

Original language	English
Pages (from-to)	3541-3546
Number of pages	6
Journal	Journal of Solid State Chemistry
Volume	178
Issue number	11
DOIs	https://doi.org/10.1016/j.jssc.2005.09.006
State	Published - Nov 2005

Funding

This research was supported by National Science Foundation grant DMR-0203342. Some of the XRD data were collected at the Diffraction User Center, Oak Ridge National Laboratory, sponsored by the Assistant Secretary for Energy Efficiency and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program, Oak Ridge National Laboratory, managed by UT-Battelle, LLC, for the US Dept. of Energy under contract DE-AC05-00OR22725. We are grateful to the reviewers for insightful comments.

Funders	Funder number
Office of Transportation Technologies
US Dept. of Energy	DE-AC05-00OR22725
National Science Foundation	DMR-0203342
Office of Energy Efficiency and Renewable Energy
Oak Ridge National Laboratory

Keywords

Order-disorder
Phase transition
Thermal expansion

Access to Document

10.1016/j.jssc.2005.09.006

Cite this

@article{2e9492f7b89a4ca49031d31c34e2fad2,

title = "Preparation and thermal expansion of (M0.5IIIM′ 0.5V)P2O7 with the cubic ZrP 2O7 structure",

abstract = "A series of compounds (M0.5IIIM′0.5V)P2O7, MIIIM′V=AlTa, FeTa, GaTa, InNb, YNb, NdTa, and BiTa that are close structural relatives of cubic ZrP2O7 were prepared. Annealing samples with MIIIM′V=InNb or YNb at temperatures above 600 °C did not lead to any long-range cation ordering. The thermal expansion characteristics of samples quenched from 1000 °C with MIIIM′V=AlTa, InNb and YNb were investigated by high-temperature powder diffraction over the temperature range 25-600 °C. There are no lattice constant discontinuities in this range, unlike ZrP2O7. (Al0.5Ta0.5)P 2O7 and (In0.5Nb0.5)P 2O7 show linear coefficients of thermal expansion (CTEs) of 11.5(2)×10-6 and 11.8(2)×10-6 K -1, respectively. These values are similar to that for the low-temperature ZrP2O7 structure. However, the linear CTE for (Y0.5Nb0.5)P2O7 (4.8(2)×10-6 K-1) is similar to that of the high-temperature form of ZrP2O7.",

keywords = "Order-disorder, Phase transition, Thermal expansion",

author = "Tamas Varga and Wilkinson, {Angus P.} and Haluska, {Michael S.} and {Andrew Payzant}, E.",

year = "2005",

month = nov,

doi = "10.1016/j.jssc.2005.09.006",

language = "English",

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pages = "3541--3546",

journal = "Journal of Solid State Chemistry",

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T1 - Preparation and thermal expansion of (M0.5IIIM′ 0.5V)P2O7 with the cubic ZrP 2O7 structure

AU - Varga, Tamas

AU - Wilkinson, Angus P.

AU - Haluska, Michael S.

AU - Andrew Payzant, E.

PY - 2005/11

Y1 - 2005/11

N2 - A series of compounds (M0.5IIIM′0.5V)P2O7, MIIIM′V=AlTa, FeTa, GaTa, InNb, YNb, NdTa, and BiTa that are close structural relatives of cubic ZrP2O7 were prepared. Annealing samples with MIIIM′V=InNb or YNb at temperatures above 600 °C did not lead to any long-range cation ordering. The thermal expansion characteristics of samples quenched from 1000 °C with MIIIM′V=AlTa, InNb and YNb were investigated by high-temperature powder diffraction over the temperature range 25-600 °C. There are no lattice constant discontinuities in this range, unlike ZrP2O7. (Al0.5Ta0.5)P 2O7 and (In0.5Nb0.5)P 2O7 show linear coefficients of thermal expansion (CTEs) of 11.5(2)×10-6 and 11.8(2)×10-6 K -1, respectively. These values are similar to that for the low-temperature ZrP2O7 structure. However, the linear CTE for (Y0.5Nb0.5)P2O7 (4.8(2)×10-6 K-1) is similar to that of the high-temperature form of ZrP2O7.

AB - A series of compounds (M0.5IIIM′0.5V)P2O7, MIIIM′V=AlTa, FeTa, GaTa, InNb, YNb, NdTa, and BiTa that are close structural relatives of cubic ZrP2O7 were prepared. Annealing samples with MIIIM′V=InNb or YNb at temperatures above 600 °C did not lead to any long-range cation ordering. The thermal expansion characteristics of samples quenched from 1000 °C with MIIIM′V=AlTa, InNb and YNb were investigated by high-temperature powder diffraction over the temperature range 25-600 °C. There are no lattice constant discontinuities in this range, unlike ZrP2O7. (Al0.5Ta0.5)P 2O7 and (In0.5Nb0.5)P 2O7 show linear coefficients of thermal expansion (CTEs) of 11.5(2)×10-6 and 11.8(2)×10-6 K -1, respectively. These values are similar to that for the low-temperature ZrP2O7 structure. However, the linear CTE for (Y0.5Nb0.5)P2O7 (4.8(2)×10-6 K-1) is similar to that of the high-temperature form of ZrP2O7.

KW - Order-disorder

KW - Phase transition

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