Experimental study of the Ca effect in the cubic-tetragonal phase transition of Ca1-xSrxTiO3

M. C. Gallardo; A. I. Becerro; F. J. Romero; J. Del Cerro; S. A.T. Redfern

doi:10.1080/00150190490455629

Experimental study of the Ca effect in the cubic-tetragonal phase transition of Ca_1-xSr_xT_iO₃

M. C. Gallardo^*, A. I. Becerro, F. J. Romero, J. Del Cerro, S. A.T. Redfern

^*Corresponding author for this work

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

Abstract

The entropy excess corresponding to the cubic to tetragonal transition in Ca0.04Sr0.96TiO3 perovskite has been obtained by integration of specific heat measured by conduction calorimetry. The order parameter of the transition has been obtained by means of neutron diffraction at low temperatures. Comparison of calorimetric data with the evolution of the order parameter indicates that this transition follows a mean field Landau potential as in SrTiO3. The linear behaviour of the excess of entropy versus temperature suggests that a 2-4 Landau potential is sufficient to describe the transition. The Ca effect in thermodinamical properties of SrTiO3 is compared with the effect of an uniaxial stress applied on pure SrTiO3.

Original language	English
Pages (from-to)	145-149
Number of pages	5
Journal	Ferroelectrics
Volume	301
DOIs	https://doi.org/10.1080/00150190490455629
Publication status	Published - Jan 1 2004
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Keywords

CaTiO
Landau theory
Neutron diffraction
Specific heat
SrTiO

Access to Document

10.1080/00150190490455629

Cite this

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title = "Experimental study of the Ca effect in the cubic-tetragonal phase transition of Ca1-xSrxTiO3",

abstract = "The entropy excess corresponding to the cubic to tetragonal transition in Ca0.04Sr0.96TiO3 perovskite has been obtained by integration of specific heat measured by conduction calorimetry. The order parameter of the transition has been obtained by means of neutron diffraction at low temperatures. Comparison of calorimetric data with the evolution of the order parameter indicates that this transition follows a mean field Landau potential as in SrTiO3. The linear behaviour of the excess of entropy versus temperature suggests that a 2-4 Landau potential is sufficient to describe the transition. The Ca effect in thermodinamical properties of SrTiO3 is compared with the effect of an uniaxial stress applied on pure SrTiO3.",

keywords = "CaTiO, Landau theory, Neutron diffraction, Specific heat, SrTiO",

author = "Gallardo, {M. C.} and Becerro, {A. I.} and Romero, {F. J.} and {Del Cerro}, J. and Redfern, {S. A.T.}",

year = "2004",

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doi = "10.1080/00150190490455629",

language = "English",

volume = "301",

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journal = "Ferroelectrics",

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TY - JOUR

T1 - Experimental study of the Ca effect in the cubic-tetragonal phase transition of Ca1-xSrxTiO3

AU - Gallardo, M. C.

AU - Becerro, A. I.

AU - Romero, F. J.

AU - Del Cerro, J.

AU - Redfern, S. A.T.

PY - 2004/1/1

Y1 - 2004/1/1

N2 - The entropy excess corresponding to the cubic to tetragonal transition in Ca0.04Sr0.96TiO3 perovskite has been obtained by integration of specific heat measured by conduction calorimetry. The order parameter of the transition has been obtained by means of neutron diffraction at low temperatures. Comparison of calorimetric data with the evolution of the order parameter indicates that this transition follows a mean field Landau potential as in SrTiO3. The linear behaviour of the excess of entropy versus temperature suggests that a 2-4 Landau potential is sufficient to describe the transition. The Ca effect in thermodinamical properties of SrTiO3 is compared with the effect of an uniaxial stress applied on pure SrTiO3.

AB - The entropy excess corresponding to the cubic to tetragonal transition in Ca0.04Sr0.96TiO3 perovskite has been obtained by integration of specific heat measured by conduction calorimetry. The order parameter of the transition has been obtained by means of neutron diffraction at low temperatures. Comparison of calorimetric data with the evolution of the order parameter indicates that this transition follows a mean field Landau potential as in SrTiO3. The linear behaviour of the excess of entropy versus temperature suggests that a 2-4 Landau potential is sufficient to describe the transition. The Ca effect in thermodinamical properties of SrTiO3 is compared with the effect of an uniaxial stress applied on pure SrTiO3.

KW - CaTiO

KW - Landau theory

KW - Neutron diffraction

KW - Specific heat

KW - SrTiO

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