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Dielectric dispersion of relaxor ferroelectric in diffusion region is related to the doping of extrinsic ions or ordering arrangement of intrinsic ions. The further explanation and unitive characterization of the dispersion property are required. Focusing on the facts that cation vacancies and dielectric dispersion in barium titanate based relaxor ferroelectric can be caused by donor doping in high concentration, three equivalently correlated Gaussian distributions of doping dopants, Curie temperature, and cation vacancy are obtained. The relevant Gibbs free energy and relation between dielectric constant and temperature of the relaxors with donor doping are deduced. The result demonstrates an increase in concentration of cation vacancy with temperature decreasing in diffusion transition region. The unipole charges caused by the cation vacancies are probably responsible for the dielectric dispersion and loss by their hopping motion.
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Keywords:
- relaxor ferroelectric /
- cation vacancy /
- donor doping
[1] Angell C A 1985 J.non-Cryst. Solids 73 1
[2] Smolenskii G A 1970 J.Phys. Soc.Jpn. 28 26
[3] Cao W Q, Yang L, Ismail M M, Feng P 2011 Ceram. Intern. 37 1587
[4] Yao X, Chen Z L, Cross L E 1983 J.Appl. Phys. 54 3399
[5] Yao X, Chen Z L, Cross L E 1984 Ferroelectrics 54 163
[6] Cross L E 1987 Ferroelectrics 76 241
[7] Zhong W L 1996 Ferroelectrics (Beijing: Science Press) p73 (in Chinese) [钟维列 1996 铁电物理学 (北京: 科学出版社第73页)]
[8] Wang L H 1988 Theory and Application of Thermal Stimulation in Dielectrics (Beijing: Science Press) p16 (in Chinese) [王力衡 1988 介质的热刺激理论及其应用(北京:科学出版社) 第16页)]
[9] Ciomaga C E, Buscaglia M T, Buscaglia V, Mitoseriu L 2011 J. Appl. Phys. 110 114110
[10] Aoujgal A, Gharbi W A, Outzourhit A, Ahamdane H, Ammar A, Tachafine A, Carru J C 2011 Ceram. Intern. 37 2069
[11] Chen W Cao W Q 2012 Acta Phys. Sin. 61 097701 (in Chinese) [陈威, 曹万强 2012 物理学报 61 097701]
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[1] Angell C A 1985 J.non-Cryst. Solids 73 1
[2] Smolenskii G A 1970 J.Phys. Soc.Jpn. 28 26
[3] Cao W Q, Yang L, Ismail M M, Feng P 2011 Ceram. Intern. 37 1587
[4] Yao X, Chen Z L, Cross L E 1983 J.Appl. Phys. 54 3399
[5] Yao X, Chen Z L, Cross L E 1984 Ferroelectrics 54 163
[6] Cross L E 1987 Ferroelectrics 76 241
[7] Zhong W L 1996 Ferroelectrics (Beijing: Science Press) p73 (in Chinese) [钟维列 1996 铁电物理学 (北京: 科学出版社第73页)]
[8] Wang L H 1988 Theory and Application of Thermal Stimulation in Dielectrics (Beijing: Science Press) p16 (in Chinese) [王力衡 1988 介质的热刺激理论及其应用(北京:科学出版社) 第16页)]
[9] Ciomaga C E, Buscaglia M T, Buscaglia V, Mitoseriu L 2011 J. Appl. Phys. 110 114110
[10] Aoujgal A, Gharbi W A, Outzourhit A, Ahamdane H, Ammar A, Tachafine A, Carru J C 2011 Ceram. Intern. 37 2069
[11] Chen W Cao W Q 2012 Acta Phys. Sin. 61 097701 (in Chinese) [陈威, 曹万强 2012 物理学报 61 097701]
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