CAJ | 학술논문

利用固相合成法制备了（1-x）（Na0.52K0.48）NbO3-x（Bi0.5Na0.5）0.94Ba0.06TiO3（KNN-xBNBT）无铅压电陶瓷.运用X射线衍射和扫描电子显微镜对材料的相结构和显微结构进行了分析观察,并研究了BNBT掺杂量对陶瓷压电及介电性能的影响.所有样品都显示出正交相钙钛矿结构,无杂相,平均晶粒尺寸随着BNBT掺杂量的增加先减小后变大.BNBT的掺入使样品的电学性能得到明显改善,当x为0.005时,样品的性能达到最佳：d33=123pC/N,kp=44%,tanδ=2.2%.
이용고상합성법제비료（1-x）（Na0.52K0.48）NbO3-x（Bi0.5Na0.5）0.94Ba0.06TiO3（KNN-xBNBT）무연압전도자.운용X사선연사화소묘전자현미경대재료적상결구화현미결구진행료분석관찰,병연구료BNBT참잡량대도자압전급개전성능적영향.소유양품도현시출정교상개태광결구,무잡상,평균정립척촌수착BNBT참잡량적증가선감소후변대.BNBT적참입사양품적전학성능득도명현개선,당x위0.005시,양품적성능체도최가：d33=123pC/N,kp=44%,tanδ=2.2%.
(1-x)(Na0.52K0.48)NbO3-x(Bi0.5Na0.5)0.94Ba0.06TiO3(KNN-xBNBT) lead-free piezoceramics were prepared by conventional solid-state sintering method.The samples were characterized by X-ray techniques and scanning electron microscopy.Piezoelectric and dielectric data were presented.All samples possess orthorhombic perovskite phases,and not any secondary phase can be certified.The average grain size decreases firstly and then increases with increasing BNBT content.Dielectric and piezoelectric properties of the ceramics are influenced obviously by BNBT addition.Appropriate amount of BNBT results in an improvement in electrical properties of the KNN ceramics.Enhanced piezoelectric and electromechanical properties are obtained with x=0.005: d33=123pC/N,kp=44%,tanδ=2.2%,showing that they could be promising candidates as lead-free piezoelectric materials.