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Title: Strong anisotropic thermal expansion in cristobalite-type BPO{sub 4}

Abstract

In this communication, the thermal expansion behavior of cristobalite-type BPO{sub 4}, determined from high-temperature X-ray diffraction studies, is being reported. BPO{sub 4} crystallizes in tetragonal lattice, with space group I-4 (No. 82) at room temperature, with unit cell parameters: a=4.3447(2), c=6.6415(5) A and V=125.37(1) A{sup 3}. The tetragonal unit cell parameters at 900 deg. C are: a=4.3939(2), c=6.6539(6) A and V=128.46(1) A{sup 3}. The results show a very strong anisotropic expansion in the lattice, with the typical thermal expansion coefficients along a- and c-axis 12.9x10{sup -6} and 2.1x10{sup -6}/ deg. C, respectively. The volume thermal expansion coefficient of the lattice is 28.2x10{sup -6}/ deg. C in the temperature range of 25-900 deg. C. The variation of the crystal structure with temperature and the thermal expansion behavior are explained in this manuscript. The role of inter-polyhedral angle on the thermal expansion behavior has also been established.

Authors:
 [1];  [1]
  1. Applied Chemistry Division, Solid State Chemistry Section, Bhabha Atomic Research Centre, Mumbai 400 085, Maharashtra (India)
Publication Date:
OSTI Identifier:
20658169
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 177; Journal Issue: 11; Other Information: DOI: 10.1016/j.jssc.2004.07.036; PII: S0022-4596(04)00396-2; Copyright (c) 2004 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; ANISOTROPY; BORON PHOSPHATES; CRISTOBALITE; SPACE GROUPS; TEMPERATURE RANGE 0273-0400 K; TEMPERATURE RANGE 0400-1000 K; TETRAGONAL LATTICES; THERMAL EXPANSION; X-RAY DIFFRACTION

Citation Formats

Achary, S N, and Tyagi, A K. Strong anisotropic thermal expansion in cristobalite-type BPO{sub 4}. United States: N. p., 2004. Web. doi:10.1016/j.jssc.2004.07.036.
Achary, S N, & Tyagi, A K. Strong anisotropic thermal expansion in cristobalite-type BPO{sub 4}. United States. doi:10.1016/j.jssc.2004.07.036.
Achary, S N, and Tyagi, A K. Mon . "Strong anisotropic thermal expansion in cristobalite-type BPO{sub 4}". United States. doi:10.1016/j.jssc.2004.07.036.
@article{osti_20658169,
title = {Strong anisotropic thermal expansion in cristobalite-type BPO{sub 4}},
author = {Achary, S N and Tyagi, A K},
abstractNote = {In this communication, the thermal expansion behavior of cristobalite-type BPO{sub 4}, determined from high-temperature X-ray diffraction studies, is being reported. BPO{sub 4} crystallizes in tetragonal lattice, with space group I-4 (No. 82) at room temperature, with unit cell parameters: a=4.3447(2), c=6.6415(5) A and V=125.37(1) A{sup 3}. The tetragonal unit cell parameters at 900 deg. C are: a=4.3939(2), c=6.6539(6) A and V=128.46(1) A{sup 3}. The results show a very strong anisotropic expansion in the lattice, with the typical thermal expansion coefficients along a- and c-axis 12.9x10{sup -6} and 2.1x10{sup -6}/ deg. C, respectively. The volume thermal expansion coefficient of the lattice is 28.2x10{sup -6}/ deg. C in the temperature range of 25-900 deg. C. The variation of the crystal structure with temperature and the thermal expansion behavior are explained in this manuscript. The role of inter-polyhedral angle on the thermal expansion behavior has also been established.},
doi = {10.1016/j.jssc.2004.07.036},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 11,
volume = 177,
place = {United States},
year = {2004},
month = {11}
}