Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

A. Mielewczyk-Gryn; S. Wachowski; K. I. Lilova; X. Guo; M. Gazda; A. Navrotsky

doi:10.1016/j.ceramint.2014.10.010

Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

A. Mielewczyk-Gryn, S. Wachowski, K. I. Lilova, X. Guo, M. Gazda, A. Navrotsky

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

25 Scopus citations

Abstract

Analysis of the influence of antimony substitution on the temperature dependence of unit cell distortion in lanthanum orthoniobate has been performed. The values of spontaneous strain and Landau order parameter for three different antimony contents have been calculated. The monoclinic-tetragonal phase transition occurring for antimony substituted lanthanum orthoniobate was found to be of the second order. High temperature oxide melt solution calorimetry has shown that antimony substitution has little influence on the stability of the monoclinic phase. The average value of enthalpy of formation of antimony substituted lanthanum orthoniobate with fergusonite structure is -132.0±0.8 kJ/mol, and that of scheelite structure is -126.4±1.5 kJ/mol, implying greater stability for the former polymorph.

Original language	English (US)
Pages (from-to)	2128-2133
Number of pages	6
Journal	Ceramics International
Volume	41
Issue number	2
DOIs	https://doi.org/10.1016/j.ceramint.2014.10.010
State	Published - Mar 1 2015
Externally published	Yes

Keywords

Enthalpy of formation
Landau order parameter
Lanthanum orthoniobate
Spontaneous strain

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2014.10.010

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title = "Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate",

abstract = "Analysis of the influence of antimony substitution on the temperature dependence of unit cell distortion in lanthanum orthoniobate has been performed. The values of spontaneous strain and Landau order parameter for three different antimony contents have been calculated. The monoclinic-tetragonal phase transition occurring for antimony substituted lanthanum orthoniobate was found to be of the second order. High temperature oxide melt solution calorimetry has shown that antimony substitution has little influence on the stability of the monoclinic phase. The average value of enthalpy of formation of antimony substituted lanthanum orthoniobate with fergusonite structure is -132.0±0.8 kJ/mol, and that of scheelite structure is -126.4±1.5 kJ/mol, implying greater stability for the former polymorph.",

keywords = "Enthalpy of formation, Landau order parameter, Lanthanum orthoniobate, Spontaneous strain",

author = "A. Mielewczyk-Gryn and S. Wachowski and Lilova, {K. I.} and X. Guo and M. Gazda and A. Navrotsky",

year = "2015",

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doi = "10.1016/j.ceramint.2014.10.010",

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T1 - Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

AU - Mielewczyk-Gryn, A.

AU - Wachowski, S.

AU - Lilova, K. I.

AU - Guo, X.

AU - Gazda, M.

AU - Navrotsky, A.

PY - 2015/3/1

Y1 - 2015/3/1

N2 - Analysis of the influence of antimony substitution on the temperature dependence of unit cell distortion in lanthanum orthoniobate has been performed. The values of spontaneous strain and Landau order parameter for three different antimony contents have been calculated. The monoclinic-tetragonal phase transition occurring for antimony substituted lanthanum orthoniobate was found to be of the second order. High temperature oxide melt solution calorimetry has shown that antimony substitution has little influence on the stability of the monoclinic phase. The average value of enthalpy of formation of antimony substituted lanthanum orthoniobate with fergusonite structure is -132.0±0.8 kJ/mol, and that of scheelite structure is -126.4±1.5 kJ/mol, implying greater stability for the former polymorph.

AB - Analysis of the influence of antimony substitution on the temperature dependence of unit cell distortion in lanthanum orthoniobate has been performed. The values of spontaneous strain and Landau order parameter for three different antimony contents have been calculated. The monoclinic-tetragonal phase transition occurring for antimony substituted lanthanum orthoniobate was found to be of the second order. High temperature oxide melt solution calorimetry has shown that antimony substitution has little influence on the stability of the monoclinic phase. The average value of enthalpy of formation of antimony substituted lanthanum orthoniobate with fergusonite structure is -132.0±0.8 kJ/mol, and that of scheelite structure is -126.4±1.5 kJ/mol, implying greater stability for the former polymorph.

KW - Enthalpy of formation

KW - Landau order parameter

KW - Lanthanum orthoniobate

KW - Spontaneous strain

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U2 - 10.1016/j.ceramint.2014.10.010

DO - 10.1016/j.ceramint.2014.10.010

M3 - Article

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SN - 0272-8842

VL - 41

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EP - 2133

JO - Ceramics International

JF - Ceramics International

IS - 2

ER -

Influence of antimony substitution on spontaneous strain and thermodynamic stability of lanthanum orthoniobate

Abstract

Keywords

ASJC Scopus subject areas

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