Ferroelectric and dielectric properties of La/Mn co-doped Bi4Ti3O12 ceramics

doi:10.1088/1674-1056/19/3/037701

Abstract La/Mn co-doped Bi₄Ti₃O₁₂ ceramics, Bi_3.25La_0.75Ti_3-xMn_xO₁₂ (x = 0.02, 0.04, 0.06, 0.08), were prepared by the solid-state reaction method. The influence of manganese substitution for the titanium part in Bi_3.25La_0.75Ti₃O₁₂ on the sintering behaviour, microstructure, Raman spectra and electrical properties was investigated. The experimental results show that the phase composition of all samples with and without manganese doping, sintered at 1000 °C, consists of a single phase with a bismuth-layered structure belonging to the crystalline phase Bi₄Ti₃O₁₂. There is no evidence of any impurity phase, but a small change in crystallographic orientation is observed. The Curie temperature of Bi_3.25La_0.75Ti_3-xMn_xO₁₂ ceramics is steadily shifted to lower temperature with increasing Mn-doping content. Moreover, the remnant polarisation (P_r) of Bi_3.25La_0.75Ti_3-xMn_xO₁₂ samples increases with Mn-doping content, and the Bi_3.25La_0.75Ti_2.92Mn_0.08O₁₂ sample exhibits the largest P_r of 16.6 μC/cm².

Keywords: bismuth titanate ceramics doping ferroelectric

Received: 17 July 2008
Revised: 16 September 2009
Accepted manuscript online:

PACS:	77.80.Bh
	77.84.Dy
	77.22.Ej	(Polarization and depolarization)
	81.20.Ev	(Powder processing: powder metallurgy, compaction, sintering, mechanical alloying, and granulation)
	61.72.up	(Other materials)
	78.30.Hv	(Other nonmetallic inorganics)

Fund: Project supported by the National Science Fund for Distinguished Young Scholars (Grant No.~50625204), National Natural Science Fund for Creative Research Groups (Grant No.~50621201), and by the Ministry of Science and Technology of China through National Basic Research Program of China (Grant No.~ 2009CB623301) and through National High Technology Research and Development Program of China (Grant No.~2006AA03Z428).

Cite this article:

Wu Yun-Yi(吴云翼), Wang Xiao-Hui(王晓慧), and Li Long-Tu(李龙土) Ferroelectric and dielectric properties of La/Mn co-doped Bi₄Ti₃O₁₂ ceramics 2010 Chin. Phys. B 19 037701

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Ferroelectric and dielectric properties of La/Mn co-doped Bi4Ti3O12 ceramics

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Ferroelectric and dielectric properties of La/Mn co-doped Bi₄Ti₃O₁₂ ceramics