Dielectric properties of high‐T_c ceramics based on BaTiO₃ with (111) texture characteristics

Abstract

Abstract0.94BaTiO3–(0.06–x)Bi0.5Li0.5TiO3–x Bi0.5Na0.5TiO3 (abbreviated as BT–BLT–BNT with x = 0, 0.015, 0.03, 0.045, 0.06) ceramics were prepared by the traditional ceramic processing route. The structure, dielectric and ferroelectric properties of the samples were investigated by X‐ray diffraction, the temperature dependence of dielectric permittivity, and hysteresis loop measurements. These results showed that all compositions have the perovskite tetragonal phase structure, and the phase‐transition temperature Tc is increasing with increasing x, the Tc is 163 °C for x equal 0.06; and the samples have good ferroelectric properties with lower coercive field and higher remanent polarization. BT–BLT–BNT ceramics prove to be a promising candidate for high‐Tc lead‐free ceramics. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Preparation and electrical properties of pseudoternary BaTiO3–CaTiO3–BaZrO3lead free piezoelectric ceramics

“…Environmental protection has aroused urgent need in developing lead free piezoelectric materials that can replace hazardous lead based Pb(Zr x Ti 12x )O 3 (PZT) ceramics to meet various piezoelectric applications. [1][2][3] Among lead free piezoelectric materials, BaTiO 3 based solid solutions attract great research attention since they exhibit excellent piezoelectric performance and their electrical properties can be tailored further by cation substitution on the A site and/or the B site of the perovskite structure. [4][5][6] However, these lead free piezoelectric ceramics generally exhibit inferior piezoelectric property compared with that of PZT based ones.…”

Dielectric Properties and Diffuse Phase Transition of Sol-Gel Derived 0.94(Bi_0.5Na_0.5)TiO₃-0.06BaTiO₃ Ceramics

“…NBT is typical ABO 3 structure which is considered to be a material of lead-free piezoelectric ceramics because it is a strong ferroelectricity with a large remanent polarization, P r =38µC/cm 2 [2] . At the same time, in the BNT, Na + can be substituted by metal ions of +1 valence (such as K + , and Li + ) [3] , which could co-occupy the A site with Ba 2+ [4] . However, NBT has a drawback of high coercive field, E c =73 kV/cm and with high conductivity, so pure BNT is difficult to be poled and cannot be a good piezoelectric material.…”

Dielectric and ferroelectric properties of lead‐free Ba1−xLaxTi1−xFexO3 ceramics

“…Therefore, it is necessary to develop environment‐friendly lead‐free ferroelectric ceramics to replace the PZT based ceramic, which became one of the main trends in the present development of ferroelectric materials. So, several studies have been performed in detail on ceramics with BaTiO 3 ‐derived compositions 3, 4. These materials have been shown to be either classical or relaxor ferroelectrics depending on both the composition and the type of ionic substitution Ba 2+ or Ti 4+ 5–12.…”