Lanthanum dopant induced transition from the ferroelectric to the relaxor state in 0.7PFW-0.3PT ceramics

Cheng Shong Hong; Sheng Yuan Chu; Cheng Che Tsai; Chi Cheng Hsu

doi:10.1016/j.ceramint.2011.03.044

Lanthanum dopant induced transition from the ferroelectric to the relaxor state in 0.7PFW-0.3PT ceramics

Cheng Shong Hong, Sheng Yuan Chu, Cheng Che Tsai, Chi Cheng Hsu

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

7 Citations (Scopus)

Abstract

In this paper, Pb_1-xLa_x(Fe_2/3W _1/3)_0.7Ti_0.3O₃ ceramics are synthesized by the conventional reaction method and the dielectric properties are investigated with the empirical law and ordering models. The lattice structure changes from tetragonal to pseudocubic after doping with lanthanum and the pyrochlore phase is induced as the amount of lanthanum dopants exceeds 5%. The effects of lanthanum dopants on the resistivity, the diffused phase transition, the space charge polarization and the dielectric loss are investigated. According to the ordering models, the long range order (LRO) ferroelectric is changed to the short range order (SRO) relaxor with the use of lanthanum dopants. It is suggested that growth of the 1:1 ordered domain is impeded by increasing the amounts of lanthanum dopants since the excess positive charge of the 1:1 ordered domain Pb_1-xLa_x(Fe _1/2W_1/2)O₃ is enhanced. Furthermore, the p-type carriers are neutralized by the electron compensation which is induced by the fewer lanthanum dopants.

Original language	English
Pages (from-to)	1911-1918
Number of pages	8
Journal	Ceramics International
Volume	37
Issue number	6
DOIs	https://doi.org/10.1016/j.ceramint.2011.03.044
Publication status	Published - 2011 Aug

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Process Chemistry and Technology
Surfaces, Coatings and Films
Materials Chemistry

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10.1016/j.ceramint.2011.03.044

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@article{6a217263164b465d9b99a7d2ada35544,

title = "Lanthanum dopant induced transition from the ferroelectric to the relaxor state in 0.7PFW-0.3PT ceramics",

abstract = "In this paper, Pb1-xLax(Fe2/3W 1/3)0.7Ti0.3O3 ceramics are synthesized by the conventional reaction method and the dielectric properties are investigated with the empirical law and ordering models. The lattice structure changes from tetragonal to pseudocubic after doping with lanthanum and the pyrochlore phase is induced as the amount of lanthanum dopants exceeds 5%. The effects of lanthanum dopants on the resistivity, the diffused phase transition, the space charge polarization and the dielectric loss are investigated. According to the ordering models, the long range order (LRO) ferroelectric is changed to the short range order (SRO) relaxor with the use of lanthanum dopants. It is suggested that growth of the 1:1 ordered domain is impeded by increasing the amounts of lanthanum dopants since the excess positive charge of the 1:1 ordered domain Pb1-xLax(Fe 1/2W1/2)O3 is enhanced. Furthermore, the p-type carriers are neutralized by the electron compensation which is induced by the fewer lanthanum dopants.",

author = "Hong, {Cheng Shong} and Chu, {Sheng Yuan} and Tsai, {Cheng Che} and Hsu, {Chi Cheng}",

note = "Funding Information: This research was supported by the National Science Council of Republic of China, under grant NSC-98-2221-E-017-002.",

year = "2011",

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doi = "10.1016/j.ceramint.2011.03.044",

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T1 - Lanthanum dopant induced transition from the ferroelectric to the relaxor state in 0.7PFW-0.3PT ceramics

AU - Hong, Cheng Shong

AU - Chu, Sheng Yuan

AU - Tsai, Cheng Che

AU - Hsu, Chi Cheng

N1 - Funding Information: This research was supported by the National Science Council of Republic of China, under grant NSC-98-2221-E-017-002.

PY - 2011/8

Y1 - 2011/8

N2 - In this paper, Pb1-xLax(Fe2/3W 1/3)0.7Ti0.3O3 ceramics are synthesized by the conventional reaction method and the dielectric properties are investigated with the empirical law and ordering models. The lattice structure changes from tetragonal to pseudocubic after doping with lanthanum and the pyrochlore phase is induced as the amount of lanthanum dopants exceeds 5%. The effects of lanthanum dopants on the resistivity, the diffused phase transition, the space charge polarization and the dielectric loss are investigated. According to the ordering models, the long range order (LRO) ferroelectric is changed to the short range order (SRO) relaxor with the use of lanthanum dopants. It is suggested that growth of the 1:1 ordered domain is impeded by increasing the amounts of lanthanum dopants since the excess positive charge of the 1:1 ordered domain Pb1-xLax(Fe 1/2W1/2)O3 is enhanced. Furthermore, the p-type carriers are neutralized by the electron compensation which is induced by the fewer lanthanum dopants.

AB - In this paper, Pb1-xLax(Fe2/3W 1/3)0.7Ti0.3O3 ceramics are synthesized by the conventional reaction method and the dielectric properties are investigated with the empirical law and ordering models. The lattice structure changes from tetragonal to pseudocubic after doping with lanthanum and the pyrochlore phase is induced as the amount of lanthanum dopants exceeds 5%. The effects of lanthanum dopants on the resistivity, the diffused phase transition, the space charge polarization and the dielectric loss are investigated. According to the ordering models, the long range order (LRO) ferroelectric is changed to the short range order (SRO) relaxor with the use of lanthanum dopants. It is suggested that growth of the 1:1 ordered domain is impeded by increasing the amounts of lanthanum dopants since the excess positive charge of the 1:1 ordered domain Pb1-xLax(Fe 1/2W1/2)O3 is enhanced. Furthermore, the p-type carriers are neutralized by the electron compensation which is induced by the fewer lanthanum dopants.

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Lanthanum dopant induced transition from the ferroelectric to the relaxor state in 0.7PFW-0.3PT ceramics

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