Effect of Ho Doping on Structure and Ferroelectric Property of Bi4-xHoxTi3O12 Ceramics

doi:10.3724/SP.J.1077.2012.11466

Abstract

Abstract: Ho-doped bismuth titanate (Bi_4-xHo_xTi₃O₁₂) ceramics were prepared by hot-press sintering. The effects of Ho doping on the crystalline phase, density, microstructure and ferroelectric property of the ceramics were investigated. At first, Bi_4-xHo_xTi₃O₁₂(x=0-0.8) powders in the main phase of Bi₄Ti₃O₁₂ were synthesized from Bi₂O₃, TiO₂ and Ho₂O₃ micro-powders by solid-state reaction at 900℃. The as-synthesized powders were then sintered by hot-press at 850℃ and 30 MPa to prepare Bi_4-xHo_xTi₃O₁₂ ceramics. With the appropriate Ho doping content of x=0-0.4, single-phased and dense (relative density >99%) Bi_4-xHo_xTi₃O₁₂ ceramics were obtained. The remanent polarization (P_r) of the ceramics increased with Ho doping increasing but decreased at x>0.4, mainly due to the oxygen vacancy concentration and different doping sites. The Bi_4-xHo_xTi₃O₁₂ ceramics have the highest value of 2P_r=13.92 μC/cm² at x=0.4, which is higher that that of the undoped Bi₄Ti₃O₁₂ ceramics. The result indicates that appropriate Ho doping can improve the ferroelectric property of Bi₄Ti₃O₁₂ ceramics.

Key words: Bi₄Ti₃O₁₂ ferroelectric ceramics, Ho doping, solid-state reaction, hot-press, ferroelectric property

CLC Number:

TG171

WANG Chuan-Bin, FU Li, SHEN Qiang, ZHANG Lian-Meng. Effect of Ho Doping on Structure and Ferroelectric Property of Bi_4-xHo_xTi₃O₁₂ Ceramics[J]. Journal of Inorganic Materials, 2012, 27(7): 721-725.

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Effect of Ho Doping on Structure and Ferroelectric Property of Bi_4-xHo_xTi₃O₁₂ Ceramics

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