Curecheriu Lavinia, Lukacs Vlad Alexandru, Padurariu Leontin, Stoian George, Ciomaga Cristina Elena
Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, Alexandru Ioan Cuza University, 11 Carol I Blvd., 700506 Iasi, Romania.
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania.
Materials (Basel). 2020 Jul 26;13(15):3324. doi: 10.3390/ma13153324.
The present paper reports the dependence of dielectric, ferroelectric and piezoelectric properties on the porosity level in BaZrTiO ceramics with porosity from 5% to 21%. Microporosity with 0-3 connectivity has been produced using PMMA microspheres as a sacrificial template. The functional properties (dielectric, ferroelectric and piezoelectric effect) are mostly affected by the "dilution effect": permittivity decreases by 40% when porosity increases by 21%, and P decreases from 13 to 5 µC/cm while the P is in the range of (2-8) µC/cm. However, the reduction of the zero-field permittivity and hysteretic behaviour of ε(E) while the tunability level is still high makes from porous ceramics interesting materials for tunability application.
本文报道了孔隙率在5%至21%的BaZrTiO陶瓷中，介电、铁电和压电性能对孔隙率水平的依赖性。使用聚甲基丙烯酸甲酯（PMMA）微球作为牺牲模板制备了具有0 - 3连通性的微孔。功能特性（介电、铁电和压电效应）主要受“稀释效应”影响：当孔隙率增加21%时，介电常数降低40%，并且在P处于(2 - 8) µC/cm范围内时，P从13降至5 µC/cm。然而，在可调谐性水平仍然很高的情况下，零场介电常数的降低以及ε(E)的滞后行为使得多孔陶瓷成为用于可调谐应用的有趣材料。
