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

Finlay D. Morrison; Derek C. Sinclair; Janet M.S. Skakle; Anthony R. West

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

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

Finlay D. Morrison^*, Derek C. Sinclair, Janet M.S. Skakle, Anthony R. West

^*Corresponding author for this work

Physics

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

112 Citations (Scopus)

Abstract

Barium titanate (BaTiO ₃) can be doped with La ³⁺ ions via partial substitution for Ba ²⁺ ions; charge balance is maintained by the creation of Ti ⁴⁺ vacancies. Samples processed in an atmosphere of 1 bar O ₂ and a temperature of 1350°C are insulating and free from electronic defects associated with either O ₂ loss or reduction of Ti ⁴⁺ to Ti ³⁺. The Curie temperature (T _c) decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (ε′) maximum at T _c occurs. For the composition Ba _1-xLa _xTi _1-x/4O ₃, where x = 0.05, ε′ has a maximum value of 19000 at 18°C, compared with a typical value of 10000 at 130°C in undoped BaTiO ₃ ceramics. This value is the highest value reported for A-site-doped BaTiO ₃ 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 - 31 Jul 1998

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

abstract = "Barium titanate (BaTiO 3) can be doped with La 3+ ions via partial substitution for Ba 2+ ions; charge balance is maintained by the creation of Ti 4+ vacancies. Samples processed in an atmosphere of 1 bar O 2 and a temperature of 1350°C are insulating and free from electronic defects associated with either O 2 loss or reduction of Ti 4+ to Ti 3+. The Curie temperature (T c) decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (ε′) maximum at T c occurs. For the composition Ba 1-xLa xTi 1-x/4O 3, where x = 0.05, ε′ has a maximum value of 19000 at 18°C, compared with a typical value of 10000 at 130°C in undoped BaTiO 3 ceramics. This value is the highest value reported for A-site-doped BaTiO 3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.",

author = "Morrison, {Finlay D.} and Sinclair, {Derek C.} and Skakle, {Janet M.S.} and West, {Anthony R.}",

year = "1998",

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

AU - Morrison, Finlay D.

AU - Sinclair, Derek C.

AU - Skakle, Janet M.S.

AU - West, Anthony R.

PY - 1998/7/31

Y1 - 1998/7/31

N2 - Barium titanate (BaTiO 3) can be doped with La 3+ ions via partial substitution for Ba 2+ ions; charge balance is maintained by the creation of Ti 4+ vacancies. Samples processed in an atmosphere of 1 bar O 2 and a temperature of 1350°C are insulating and free from electronic defects associated with either O 2 loss or reduction of Ti 4+ to Ti 3+. The Curie temperature (T c) decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (ε′) maximum at T c occurs. For the composition Ba 1-xLa xTi 1-x/4O 3, where x = 0.05, ε′ has a maximum value of 19000 at 18°C, compared with a typical value of 10000 at 130°C in undoped BaTiO 3 ceramics. This value is the highest value reported for A-site-doped BaTiO 3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.

AB - Barium titanate (BaTiO 3) can be doped with La 3+ ions via partial substitution for Ba 2+ ions; charge balance is maintained by the creation of Ti 4+ vacancies. Samples processed in an atmosphere of 1 bar O 2 and a temperature of 1350°C are insulating and free from electronic defects associated with either O 2 loss or reduction of Ti 4+ to Ti 3+. The Curie temperature (T c) decreases approximately linearly as the lanthanum content increases and, at the same time, an increase in the permittivity (ε′) maximum at T c occurs. For the composition Ba 1-xLa xTi 1-x/4O 3, where x = 0.05, ε′ has a maximum value of 19000 at 18°C, compared with a typical value of 10000 at 130°C in undoped BaTiO 3 ceramics. This value is the highest value reported for A-site-doped BaTiO 3 and is linked to the mechanism of combined A-site doping and Ti-vacancy creation.

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JF - Journal of the American Ceramic Society

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ER -

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

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