Grain size effects on the ferroelectric-paraelectric transition, the dielectric constant, and the lattice parameters in lanthana-substituted lead titanate

K. Keizer, A.J. Burggraaf

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Abstract

The effect of the grain size on unit‐cell dimensions and dielectric properties has been studied in ceramic lanthana‐substituted lead titanate of the general composition Pb1−αxLaxTiO3+x (1.5−α) with α = 1.20 and x = 0.07 (PLT7) and x = 0.18 (PLT18). The grain size ranges from 0.6 to 11 μm and the effects are most pronounced on the smaller sizes. The tetragonal distortion, characterized by the ratio c/a of the unit‐cell dimensions c and a, decreases by decreasing grain size. This effect becomes relatively smaller by decreasing temperature. A decrease of the grain size leads to a decrease of the maximum value of the dielectric constant ϵ′ at the Curie temperature T′c and to an increase of ϵ′ at lower temperatures. The Curie temperature shifts to a lower temperature while the phase transition is less sharp with decreasing grain size. The results can be discussed in terms of an average value of internal compression stresses in the direction of the c‐axis of the crystal.
Original languageEnglish
Pages (from-to)561-569
JournalPhysica Status Solidi A: Applied research
Volume26
Issue number2
DOIs
Publication statusPublished - 1974

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Lanthanum
lanthanum
Lattice constants
Ferroelectric materials
lattice parameters
Permittivity
Lead
grain size
permittivity
Curie temperature
Dielectric properties
Temperature
Phase transitions
Crystals
dielectric properties
Chemical analysis
lead titanate
ceramics
shift
crystals

Cite this

@article{9981536fd0854ace8c65c6f60cfffe27,
title = "Grain size effects on the ferroelectric-paraelectric transition, the dielectric constant, and the lattice parameters in lanthana-substituted lead titanate",
abstract = "The effect of the grain size on unit‐cell dimensions and dielectric properties has been studied in ceramic lanthana‐substituted lead titanate of the general composition Pb1−αxLaxTiO3+x (1.5−α) with α = 1.20 and x = 0.07 (PLT7) and x = 0.18 (PLT18). The grain size ranges from 0.6 to 11 μm and the effects are most pronounced on the smaller sizes. The tetragonal distortion, characterized by the ratio c/a of the unit‐cell dimensions c and a, decreases by decreasing grain size. This effect becomes relatively smaller by decreasing temperature. A decrease of the grain size leads to a decrease of the maximum value of the dielectric constant ϵ′ at the Curie temperature T′c and to an increase of ϵ′ at lower temperatures. The Curie temperature shifts to a lower temperature while the phase transition is less sharp with decreasing grain size. The results can be discussed in terms of an average value of internal compression stresses in the direction of the c‐axis of the crystal.",
author = "K. Keizer and A.J. Burggraaf",
year = "1974",
doi = "10.1002/pssa.2210260220",
language = "English",
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pages = "561--569",
journal = "Physica status solidi A",
issn = "1862-6300",
publisher = "Wiley-VCH Verlag",
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}

Grain size effects on the ferroelectric-paraelectric transition, the dielectric constant, and the lattice parameters in lanthana-substituted lead titanate. / Keizer, K.; Burggraaf, A.J.

In: Physica Status Solidi A: Applied research, Vol. 26, No. 2, 1974, p. 561-569.

Research output: Contribution to journalArticleAcademic

TY - JOUR

T1 - Grain size effects on the ferroelectric-paraelectric transition, the dielectric constant, and the lattice parameters in lanthana-substituted lead titanate

AU - Keizer, K.

AU - Burggraaf, A.J.

PY - 1974

Y1 - 1974

N2 - The effect of the grain size on unit‐cell dimensions and dielectric properties has been studied in ceramic lanthana‐substituted lead titanate of the general composition Pb1−αxLaxTiO3+x (1.5−α) with α = 1.20 and x = 0.07 (PLT7) and x = 0.18 (PLT18). The grain size ranges from 0.6 to 11 μm and the effects are most pronounced on the smaller sizes. The tetragonal distortion, characterized by the ratio c/a of the unit‐cell dimensions c and a, decreases by decreasing grain size. This effect becomes relatively smaller by decreasing temperature. A decrease of the grain size leads to a decrease of the maximum value of the dielectric constant ϵ′ at the Curie temperature T′c and to an increase of ϵ′ at lower temperatures. The Curie temperature shifts to a lower temperature while the phase transition is less sharp with decreasing grain size. The results can be discussed in terms of an average value of internal compression stresses in the direction of the c‐axis of the crystal.

AB - The effect of the grain size on unit‐cell dimensions and dielectric properties has been studied in ceramic lanthana‐substituted lead titanate of the general composition Pb1−αxLaxTiO3+x (1.5−α) with α = 1.20 and x = 0.07 (PLT7) and x = 0.18 (PLT18). The grain size ranges from 0.6 to 11 μm and the effects are most pronounced on the smaller sizes. The tetragonal distortion, characterized by the ratio c/a of the unit‐cell dimensions c and a, decreases by decreasing grain size. This effect becomes relatively smaller by decreasing temperature. A decrease of the grain size leads to a decrease of the maximum value of the dielectric constant ϵ′ at the Curie temperature T′c and to an increase of ϵ′ at lower temperatures. The Curie temperature shifts to a lower temperature while the phase transition is less sharp with decreasing grain size. The results can be discussed in terms of an average value of internal compression stresses in the direction of the c‐axis of the crystal.

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DO - 10.1002/pssa.2210260220

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JO - Physica status solidi A

JF - Physica status solidi A

SN - 1862-6300

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ER -