Low thermal expansion materials: a comparison of the structural behaviour of La0.33Ti2(PO4)3, Sr0.5Ti2(PO4)3 and NaTi2(PO4)3

Philip Lightfoot; DA Woodcock; JD Jorgensen; S Short

Low thermal expansion materials: a comparison of the structural behaviour of La_0.33Ti₂(PO₄)₃, Sr_0.5Ti₂(PO₄)₃ and NaTi₂(PO₄)₃

Philip Lightfoot, DA Woodcock, JD Jorgensen, S Short

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

Abstract

Variable temperature neutron powder diffraction data have been used to examine the structural mechanism of unusual thermal expansion behaviour in La0.33Ti2(PO4)(3) (LaTP). These data are compared to those we have recently reported for the related systems NaTi2(PO4)(3) (NaTP) and Sr0.5Ti2(PO4)(3) (SrTP), which differ in the extent of occupation of the extra-Framework MI (La, Sr, Na) cation sites. The root cause of the unusual behaviour is ascribed to the differing expansivities of the occupied and vacant MI sites. This leads to cooperative rotations of TiO6 and PO4 polyhedra, which can be used to quantify and rationalise the overall anisotropic thermal expansion behaviour. (C) 1999 Elsevier Science Ltd. All rights reserved.

Original language	English
Pages (from-to)	53
Number of pages	53
Journal	International Journal of Inorganic Materials
Volume	1
Publication status	Published - Apr 1999

Keywords

ceramics
oxides
neuron diffraction
crystal structure
thermal expansion
RAY-DIFFRACTION DATA

Cite this

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title = "Low thermal expansion materials: a comparison of the structural behaviour of La0.33Ti2(PO4)3, Sr0.5Ti2(PO4)3 and NaTi2(PO4)3",

abstract = "Variable temperature neutron powder diffraction data have been used to examine the structural mechanism of unusual thermal expansion behaviour in La0.33Ti2(PO4)(3) (LaTP). These data are compared to those we have recently reported for the related systems NaTi2(PO4)(3) (NaTP) and Sr0.5Ti2(PO4)(3) (SrTP), which differ in the extent of occupation of the extra-Framework MI (La, Sr, Na) cation sites. The root cause of the unusual behaviour is ascribed to the differing expansivities of the occupied and vacant MI sites. This leads to cooperative rotations of TiO6 and PO4 polyhedra, which can be used to quantify and rationalise the overall anisotropic thermal expansion behaviour. (C) 1999 Elsevier Science Ltd. All rights reserved.",

keywords = "ceramics, oxides, neuron diffraction, crystal structure, thermal expansion, RAY-DIFFRACTION DATA",

author = "Philip Lightfoot and DA Woodcock and JD Jorgensen and S Short",

year = "1999",

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language = "English",

volume = "1",

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TY - JOUR

T1 - Low thermal expansion materials: a comparison of the structural behaviour of La0.33Ti2(PO4)3, Sr0.5Ti2(PO4)3 and NaTi2(PO4)3

AU - Lightfoot, Philip

AU - Woodcock, DA

AU - Jorgensen, JD

AU - Short, S

PY - 1999/4

Y1 - 1999/4

N2 - Variable temperature neutron powder diffraction data have been used to examine the structural mechanism of unusual thermal expansion behaviour in La0.33Ti2(PO4)(3) (LaTP). These data are compared to those we have recently reported for the related systems NaTi2(PO4)(3) (NaTP) and Sr0.5Ti2(PO4)(3) (SrTP), which differ in the extent of occupation of the extra-Framework MI (La, Sr, Na) cation sites. The root cause of the unusual behaviour is ascribed to the differing expansivities of the occupied and vacant MI sites. This leads to cooperative rotations of TiO6 and PO4 polyhedra, which can be used to quantify and rationalise the overall anisotropic thermal expansion behaviour. (C) 1999 Elsevier Science Ltd. All rights reserved.

AB - Variable temperature neutron powder diffraction data have been used to examine the structural mechanism of unusual thermal expansion behaviour in La0.33Ti2(PO4)(3) (LaTP). These data are compared to those we have recently reported for the related systems NaTi2(PO4)(3) (NaTP) and Sr0.5Ti2(PO4)(3) (SrTP), which differ in the extent of occupation of the extra-Framework MI (La, Sr, Na) cation sites. The root cause of the unusual behaviour is ascribed to the differing expansivities of the occupied and vacant MI sites. This leads to cooperative rotations of TiO6 and PO4 polyhedra, which can be used to quantify and rationalise the overall anisotropic thermal expansion behaviour. (C) 1999 Elsevier Science Ltd. All rights reserved.

KW - ceramics

KW - oxides

KW - neuron diffraction

KW - crystal structure

KW - thermal expansion

KW - RAY-DIFFRACTION DATA

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M3 - Article

SN - 1466-6049

VL - 1

SP - 53

JO - International Journal of Inorganic Materials

JF - International Journal of Inorganic Materials

ER -

Low thermal expansion materials: a comparison of the structural behaviour of La_0.33Ti₂(PO₄)₃, Sr_0.5Ti₂(PO₄)₃ and NaTi₂(PO₄)₃

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