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Structural and ferroelectric properties of perovskite Pb(1?x)(K0.5Sm0.5)xTiO3 ceramics

机译:钙钛矿Pb (1? x (K 0.5 Sm 0.5 < em> x TiO 3 陶瓷

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PbTiO3 has the highest tetragonal distortion (c/a ~ 1.064) and highest spontaneous polarization among perovskite titanates. But, it is hazardous and hence one needs to reduce Pb content by substituting or reducing Pb content for use in practical applications. Pb(1?x)(K0.5Sm0.5)xTiO3 (0 ≤ x ≤ 0.5) perovskite powders were synthesized by sol–gel process, where Pb2+ was replaced by a combination of K0.51+Sm0.53+ (equivalent charge and comparable ionic radius) providing an excellent substitution model to study changes in structural and electrical properties. Vibrational properties and dielectric properties are modified with substitution. A polar tetragonal to a nearly nonpolar cubic phase transition decreases to lower temperatures with substitution due to the reduction of the lattice strain with substitution. Ferroelectricity is retained even for x = 0.5, which has a nearly cubic phase and makes the material technologically important.
机译:PbTiO 3 在钙钛矿钛酸盐中具有最高的四方畸变( c / a 〜1.064)和最高的自发极化。但是,这是危险的,因此需要通过代替或减少用于实际应用中的铅含量来降低铅含量。 Pb (1? x (K 0.5 Sm 0.5 x TiO 3 ( 0≤ x ≤0.5)通过溶胶-凝胶法合成钙钛矿粉,其中Pb 2 + 被K 0.5 1 + Sm 0.5 3 + (等效电荷和可比较的离子半径)可提供出色的取代模型来研究结构和电学性质的变化。振动特性和介电特性可通过替换进行修改。极性四边形到几乎非极性立方的相变会随着取代而降低,从而降低温度,这是由于取代引起的晶格应变降低所致。甚至在 x = 0.5时仍保留铁电,它具有接近 cubic 的相,这使得材料在技术上很重要。

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