Multiferroic properties of BiFeO₃ doped Bi(MgTi)O₃–PbTiO₃ ceramic system

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• 作者：Radheshyam Rai ; Andrei L. Kholkin ; Seema Sharma
• 关键词：Ceramics ; Magnetic materials ; Materials science ; Perovskites
• 刊名：Journal of Alloys and Compounds
• 出版年：2010
• 出版时间：17 September 2010
• 年：2010
• 卷：506
• 期：2
• 页码：815-819
• 全文大小：429 K

文摘

Ceramic samples of [BiFeO₃]_y(BiMg_0.5Ti_0.5O₃)_1−y]_0.55[PbTiO₃]_0.45 designated as (BF–BMT–PT) were prepared by high temperature solid-state reaction method. X-ray diffraction analysis of the powder samples suggests the formation of a single-phase material with transformation from rhombohedral to tetragonal crystal structure with increase in BF content. Polarization vs electric field (P–E) hysteresis studies show maximum remanent polarization (P_r  1.4 μC/cm²) for composition y = 0.08. Dielectric studies of the compounds as a function of temperature at frequency 100 kHz show that the compounds undergo a diffuse phase transition with a transition temperature increasing with increasing y. The diffusivity parameter of the phase transition for these compounds yielded values between 1.6 and 1.8 indicating significant variation of degree of disordering in the system.