Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the {Mathematical expression} phase transition in anorthite

Simon A.T. Redfern; Ekhard Salje

doi:10.1007/BF00308224

Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the {Mathematical expression} phase transition in anorthite

Simon A.T. Redfern^*, Ekhard Salje

^*Corresponding author for this work

University of Cambridge

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

78 Citations (Scopus)

Abstract

The temperature dependence of the lattice parameters of pure anorthite with high Al/Si order reveals the predicted tricritical behaviour of the {Mathematical expression} phase transition at T_c^*=510 K. The spontaneous strain couples to the order parameter Q° as x_i∝S_xQⁱQ°² with S_xQ¹=4.166×10^-3, S_xQ²=0.771×10^-3, S_xQ³=-7.223×10^-3 for the diagonal elements. The temperature dependence of Q° is {Mathematical expression} A strong dependence of T_c^*, S_xQⁱ and β is predicted for Al/Si disordered anorthite.

Original language	English
Pages (from-to)	189-195
Number of pages	7
Journal	Physics and Chemistry of Minerals
Volume	14
Issue number	2
DOIs	https://doi.org/10.1007/BF00308224
Publication status	Published - Feb 1987
Externally published	Yes

ASJC Scopus Subject Areas

General Materials Science
Geochemistry and Petrology

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title = "Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the {Mathematical expression} phase transition in anorthite",

abstract = "The temperature dependence of the lattice parameters of pure anorthite with high Al/Si order reveals the predicted tricritical behaviour of the {Mathematical expression} phase transition at Tc*=510 K. The spontaneous strain couples to the order parameter Q° as xi∝SxQiQ°2 with SxQ1=4.166×10-3, SxQ2=0.771×10-3, SxQ3=-7.223×10-3 for the diagonal elements. The temperature dependence of Q° is {Mathematical expression} A strong dependence of Tc*, SxQi and β is predicted for Al/Si disordered anorthite.",

author = "Redfern, {Simon A.T.} and Ekhard Salje",

year = "1987",

month = feb,

doi = "10.1007/BF00308224",

language = "English",

volume = "14",

pages = "189--195",

journal = "Physics and Chemistry of Minerals",

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T1 - Thermodynamics of plagioclase II

T2 - Temperature evolution of the spontaneous strain at the {Mathematical expression} phase transition in anorthite

AU - Redfern, Simon A.T.

AU - Salje, Ekhard

PY - 1987/2

Y1 - 1987/2

N2 - The temperature dependence of the lattice parameters of pure anorthite with high Al/Si order reveals the predicted tricritical behaviour of the {Mathematical expression} phase transition at Tc*=510 K. The spontaneous strain couples to the order parameter Q° as xi∝SxQiQ°2 with SxQ1=4.166×10-3, SxQ2=0.771×10-3, SxQ3=-7.223×10-3 for the diagonal elements. The temperature dependence of Q° is {Mathematical expression} A strong dependence of Tc*, SxQi and β is predicted for Al/Si disordered anorthite.

AB - The temperature dependence of the lattice parameters of pure anorthite with high Al/Si order reveals the predicted tricritical behaviour of the {Mathematical expression} phase transition at Tc*=510 K. The spontaneous strain couples to the order parameter Q° as xi∝SxQiQ°2 with SxQ1=4.166×10-3, SxQ2=0.771×10-3, SxQ3=-7.223×10-3 for the diagonal elements. The temperature dependence of Q° is {Mathematical expression} A strong dependence of Tc*, SxQi and β is predicted for Al/Si disordered anorthite.

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JO - Physics and Chemistry of Minerals

JF - Physics and Chemistry of Minerals

IS - 2

ER -

Thermodynamics of plagioclase II: Temperature evolution of the spontaneous strain at the {Mathematical expression} phase transition in anorthite

Abstract

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