Padurariu Leontin, Lukacs Vlad-Alexandru, Stoian George, Lupu Nicoleta, Curecheriu Lavinia Petronela
Dielectrics, Ferroelectrics & Multiferroics Group, Faculty of Physics, "Alexandru Ioan Cuza" University of Iasi, 11 Carol I Boulevard, 700506 Iasi, Romania.
National Institute of Research and Development for Technical Physics, 700050 Iasi, Romania.
Materials (Basel). 2020 Oct 1;13(19):4386. doi: 10.3390/ma13194386.
In the present work, BaZrTiO ceramics with grain sizes between 0.45 and 135 µm were prepared by solid-state reaction and classical sintering. The effect of grain size on dielectric properties was systematically explored, and it was found that dielectric permittivity reaches a maximum value for grain sizes between 1.5 and 10 µm and then rapidly drops for larger grain sizes. A numerical finite element method was employed to eliminate the effect of porosity on the effective values of permittivity. The results indicate that it is possible to have a critical size in slightly doped barium titanate ceramics with enhanced functional properties for a grain size between 1.5 and 10 µm.
在本工作中，通过固态反应和传统烧结制备了晶粒尺寸在0.45至135微米之间的BaZrTiO陶瓷。系统地研究了晶粒尺寸对介电性能的影响，发现介电常数在晶粒尺寸为1.5至10微米时达到最大值，然后对于更大的晶粒尺寸迅速下降。采用数值有限元方法消除孔隙率对介电常数有效值的影响。结果表明，对于晶粒尺寸在1.5至10微米之间的微掺杂钛酸钡陶瓷，有可能存在一个具有增强功能特性的临界尺寸。
