Novel doping mechanism for very-high-permittivity barium titanate ceramics

Finlay D Morrison; DC Sinclair; JMS Skakle; AR West

doi:10.1111/j.1151-2916.1998.tb02575.x

Novel doping mechanism for very-high-permittivity barium titanate ceramics

Finlay D Morrison, DC Sinclair, JMS Skakle, AR West

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

113 Citations (Scopus)

Abstract

Barium titanate (BaTiO3) can be doped with La3+ ions via partial substitution for Ba2+ ions; charge balance Is maintained by the creation of Ti4+ vacancies. Samples processed in an atmosphere of 1 bar O-2 and a temperature of 1350 degrees C are insulating and free from electronic defects associated with either O-2 loss or reduction of Ti4+ to Ti3+. The Curie temperature (T-c)decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (epsilon') maximum at T-c occurs. For the composition Ba1-xLaxTi1-x/4O3, where x = 0.05, epsilon' has a maximum value of 19000 at 18 degrees C, compared with a typical value of 10000 at 130 degrees C in undoped BaTiO3 ceramics. This value is the highest value reported for A-site-doped BaTiO3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.

Original language	English
Pages (from-to)	1957-1960
Number of pages	4
Journal	Journal of the American Ceramic Society
Volume	81
Issue number	7
DOIs	https://doi.org/10.1111/j.1151-2916.1998.tb02575.x
Publication status	Published - Jul 1998

Keywords

BATIO3
DEFECT

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10.1111/j.1151-2916.1998.tb02575.x

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title = "Novel doping mechanism for very-high-permittivity barium titanate ceramics",

abstract = "Barium titanate (BaTiO3) can be doped with La3+ ions via partial substitution for Ba2+ ions; charge balance Is maintained by the creation of Ti4+ vacancies. Samples processed in an atmosphere of 1 bar O-2 and a temperature of 1350 degrees C are insulating and free from electronic defects associated with either O-2 loss or reduction of Ti4+ to Ti3+. The Curie temperature (T-c)decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (epsilon') maximum at T-c occurs. For the composition Ba1-xLaxTi1-x/4O3, where x = 0.05, epsilon' has a maximum value of 19000 at 18 degrees C, compared with a typical value of 10000 at 130 degrees C in undoped BaTiO3 ceramics. This value is the highest value reported for A-site-doped BaTiO3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.",

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author = "Morrison, {Finlay D} and DC Sinclair and JMS Skakle and AR West",

year = "1998",

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language = "English",

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T1 - Novel doping mechanism for very-high-permittivity barium titanate ceramics

AU - Morrison, Finlay D

AU - Sinclair, DC

AU - Skakle, JMS

AU - West, AR

PY - 1998/7

Y1 - 1998/7

N2 - Barium titanate (BaTiO3) can be doped with La3+ ions via partial substitution for Ba2+ ions; charge balance Is maintained by the creation of Ti4+ vacancies. Samples processed in an atmosphere of 1 bar O-2 and a temperature of 1350 degrees C are insulating and free from electronic defects associated with either O-2 loss or reduction of Ti4+ to Ti3+. The Curie temperature (T-c)decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (epsilon') maximum at T-c occurs. For the composition Ba1-xLaxTi1-x/4O3, where x = 0.05, epsilon' has a maximum value of 19000 at 18 degrees C, compared with a typical value of 10000 at 130 degrees C in undoped BaTiO3 ceramics. This value is the highest value reported for A-site-doped BaTiO3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.

AB - Barium titanate (BaTiO3) can be doped with La3+ ions via partial substitution for Ba2+ ions; charge balance Is maintained by the creation of Ti4+ vacancies. Samples processed in an atmosphere of 1 bar O-2 and a temperature of 1350 degrees C are insulating and free from electronic defects associated with either O-2 loss or reduction of Ti4+ to Ti3+. The Curie temperature (T-c)decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (epsilon') maximum at T-c occurs. For the composition Ba1-xLaxTi1-x/4O3, where x = 0.05, epsilon' has a maximum value of 19000 at 18 degrees C, compared with a typical value of 10000 at 130 degrees C in undoped BaTiO3 ceramics. This value is the highest value reported for A-site-doped BaTiO3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.

KW - BATIO3

KW - DEFECT

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DO - 10.1111/j.1151-2916.1998.tb02575.x

M3 - Article

SN - 0002-7820

VL - 81

SP - 1957

EP - 1960

JO - Journal of the American Ceramic Society

JF - Journal of the American Ceramic Society

IS - 7

ER -

Novel doping mechanism for very-high-permittivity barium titanate ceramics

Abstract

Keywords

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