Microstructure and Electric Properties of Strontium Lanthanum Niobate Ceramics

Strontium lanthanum niobate (SLN) ceramics were prepared by the conventional mixed-oxide method and the crystalline microstructure, surface morphology and electric properties were investigated. The x-ray diffraction pattern shows that there exist no other phases. The grains turn from club-shaped into sheet and become uniform as lanthanum content increases from 0.03 to 0.12. The dielectric constant decreases with the increasing lanthanum content. As the lanthanum content increases from 0.03 to 0.12, the hysteresis loop becomes gradually slimmer and slimmer, and then both the remanent polarization and the coercive field decrease.