Phase transitions in undoped BaCeO3

A.V. Kuzmin; V.P. Gorelov; B.T. Melekh; M. Glerup; F.W. Poulsen

doi:10.1016/S0167-2738(03)00247-9

Phase transitions in undoped BaCeO₃

A.V. Kuzmin, V.P. Gorelov, B.T. Melekh, M. Glerup, F.W. Poulsen

Research output: Contribution to journal › Conference article › Research › peer-review

Abstract

The linear thermal expansion (370-1500 K) and electrical conductivity (950-1220 K) have been measured for undoped BaCeO3 in dry air, pH(2)O = 40 Pa. Samples were made both by conventional sintering and by solidification from inductive melting. Raman spectra were measured from 298 to 773 K. The obtained temperature dependencies, DeltaL(T) and sigma(T) upon heating and cooling, were treated mathematically by the method of differences (difference between experimental points and approximating the dependence by a first degree polynomial). This permitted to determine the position and the order of the structural phase transitions in BaCeO3. Five second-order transitions at 480 +/- 10, 530 +/- 10, 900 +/- 10, 1030 +/- 20 and 1170 +/- 20 K, and also one first-order transition at 665 +/- 10 K, were found. The transitions at 900 and 1030 K have not been reported before. (C) 2003 Elsevier B.V. All rights reserved.

Original language	English
Journal	Solid State Ionics
Volume	162
Pages (from-to)	13-22
ISSN	0167-2738
DOIs	https://doi.org/10.1016/S0167-2738(03)00247-9
Publication status	Published - 2003
Event	11th International Conference on Solid State Protonic Conductors - Guildford, United Kingdom Duration: 27 Aug 2002 → 30 Aug 2002 Conference number: 11

Conference

Conference	11th International Conference on Solid State Protonic Conductors
Number	11
Country/Territory	United Kingdom
City	Guildford
Period	27/08/2002 → 30/08/2002

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10.1016/S0167-2738(03)00247-9

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Cite this

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title = "Phase transitions in undoped BaCeO3",

abstract = "The linear thermal expansion (370-1500 K) and electrical conductivity (950-1220 K) have been measured for undoped BaCeO3 in dry air, pH(2)O = 40 Pa. Samples were made both by conventional sintering and by solidification from inductive melting. Raman spectra were measured from 298 to 773 K. The obtained temperature dependencies, DeltaL(T) and sigma(T) upon heating and cooling, were treated mathematically by the method of differences (difference between experimental points and approximating the dependence by a first degree polynomial). This permitted to determine the position and the order of the structural phase transitions in BaCeO3. Five second-order transitions at 480 +/- 10, 530 +/- 10, 900 +/- 10, 1030 +/- 20 and 1170 +/- 20 K, and also one first-order transition at 665 +/- 10 K, were found. The transitions at 900 and 1030 K have not been reported before. (C) 2003 Elsevier B.V. All rights reserved. ",

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T1 - Phase transitions in undoped BaCeO3

AU - Kuzmin, A.V.

AU - Gorelov, V.P.

AU - Melekh, B.T.

AU - Glerup, M.

AU - Poulsen, F.W.

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N2 - The linear thermal expansion (370-1500 K) and electrical conductivity (950-1220 K) have been measured for undoped BaCeO3 in dry air, pH(2)O = 40 Pa. Samples were made both by conventional sintering and by solidification from inductive melting. Raman spectra were measured from 298 to 773 K. The obtained temperature dependencies, DeltaL(T) and sigma(T) upon heating and cooling, were treated mathematically by the method of differences (difference between experimental points and approximating the dependence by a first degree polynomial). This permitted to determine the position and the order of the structural phase transitions in BaCeO3. Five second-order transitions at 480 +/- 10, 530 +/- 10, 900 +/- 10, 1030 +/- 20 and 1170 +/- 20 K, and also one first-order transition at 665 +/- 10 K, were found. The transitions at 900 and 1030 K have not been reported before. (C) 2003 Elsevier B.V. All rights reserved.

AB - The linear thermal expansion (370-1500 K) and electrical conductivity (950-1220 K) have been measured for undoped BaCeO3 in dry air, pH(2)O = 40 Pa. Samples were made both by conventional sintering and by solidification from inductive melting. Raman spectra were measured from 298 to 773 K. The obtained temperature dependencies, DeltaL(T) and sigma(T) upon heating and cooling, were treated mathematically by the method of differences (difference between experimental points and approximating the dependence by a first degree polynomial). This permitted to determine the position and the order of the structural phase transitions in BaCeO3. Five second-order transitions at 480 +/- 10, 530 +/- 10, 900 +/- 10, 1030 +/- 20 and 1170 +/- 20 K, and also one first-order transition at 665 +/- 10 K, were found. The transitions at 900 and 1030 K have not been reported before. (C) 2003 Elsevier B.V. All rights reserved.

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