CAJ | 학술논문

研究保温时间对0.98(K0.5Na0.5)NbO3?0.02LaFeO3(缩写为0.98KNN?0.02LF)无铅陶瓷相结构、显微组织、介电性能及铁电性能的影响。所有烧结样品均为纯的伪立方钙钛矿相，保温时间对相结构影响不大。随着保温时间的延长，样品的XRD衍射峰逐渐增强，并且向低角度移动。SEM观察结果显示，随着保温时间的延长，陶瓷样品的致密性提高，晶粒异常长大并出现孪晶结构。介电温谱表明，随着保温时间的延长，介电性能有所降低。电滞回线结果表明，2Pr随着保温时间的延长而增大的程度有所减小，而2Ec略有增加。在1150°C烧结2 h得的到陶瓷的性能较优：εr=2253，tanδ<5%，2Pr=34.51μC/cm2，2Ec=5.07 kV/mm。
연구보온시간대0.98(K0.5Na0.5)NbO3?0.02LaFeO3(축사위0.98KNN?0.02LF)무연도자상결구、현미조직、개전성능급철전성능적영향。소유소결양품균위순적위립방개태광상，보온시간대상결구영향불대。수착보온시간적연장，양품적XRD연사봉축점증강，병차향저각도이동。SEM관찰결과현시，수착보온시간적연장，도자양품적치밀성제고，정립이상장대병출현련정결구。개전온보표명，수착보온시간적연장，개전성능유소강저。전체회선결과표명，2Pr수착보온시간적연장이증대적정도유소감소，이2Ec략유증가。재1150°C소결2 h득적도도자적성능교우：εr=2253，tanδ<5%，2Pr=34.51μC/cm2，2Ec=5.07 kV/mm。
The effects of dwell time on the phase structure, microstructure, and electrical properties were investigated for the 0.98(K0.5Na0.5)NbO3?0.02LaFeO3 ceramics (abbreviated as 0.98KNN?0.02LF). All the ceramics sintered for different dwell time are of pure phase and the peak intensity of the 0.98KNN?0.02LF ceramics becomes stronger with a longer dwell time. Denser microstructures with larger grain size are developed for the sample with a longer dwell time. The maximum dielectric permittivity decreases with increasing the dwell time, and the deteriorative dielectric properties are due to the increasing grain size and the domain wall motion. Ferroelectric properties results indicate that 2Pr value slightly decreases with increasing the dwell time, while the 2Ec value increases. Consequently, the 0.98KNN?0.02LF ceramic sintered at 1150 °C for 2 h shows optimum dielectric properties (εr=2253 and tanδ<5%) and ferroelectric properties (2Pr=34.51μC/cm2 and 2Ec=5.07 kV/mm).