Nb掺杂SrBi_4Ti_4O_(15)陶瓷的铁电介电性能

Ferroelectric and Dielectric Properties of Nb-doped SrBi_4Ti_4O_(15) Ceramics

用传统的固相烧结工艺,制备了铌掺杂SrBi_4Ti_4O_(15)(SBTi)铁电陶瓷SrBi4-x/3Ti4-xNbxO15(SBTN-x),Nb掺杂量x=0.00,0.003,0.012,0.03和0.06.X射线衍射的结果表明,所有样品均为单一的层状钙钛矿结构相,Nb掺杂未改变SBTi的晶体结构.铁电测量结果表明,Nb掺杂使SBTi的铁电性能得到较大改善.随掺杂量x的增加,样品的剩余极化(2Pr)呈现出先增大,后减小的规律.在x=0.03时,2Pr达到最大值24.7μC/cm2,而SrBi4Ti4O15的2Pr仅为15.8μC/cm2,掺杂使2Pr提高近60%.同时,样品的矫顽场几乎不随掺杂量的改变而变化.掺杂后,样品的居里温度变化很小,表明Nb对SrBi_4Ti_4O_(15)的B位掺杂基本未影响材料的热稳定性能.

The ferroelecic ceramics samples of SrBi_ 4-x/3 Ti_ 4-x Nb_ x O_ 15 (x = 0.00, 0.003, 0.012, 0.03, 0.06) have been prepared by the solid-state reaction method. The crystal structure was analyzed by the X-ray diffraction. It is found that the crystal structure of SrBi_ 4 Ti_ 4 O_ 15 (SBTi) is not affected by Nb-doping. The ferroelectric properties were improved notably by Nb-doping. The remnant polarization (2P_ r ) increases at first,then decreases with the increase of niobium content. As niobium content is...