CAJ | 학술논문

采用固相法制备了掺杂(K0.5Bi0.5)TiO3（KBT）的钛酸钡基无铅PTC陶瓷材料(K0.5Bi0.5)xBa(1–x)TiO3。利用X射线衍射、扫描电子显微镜、电阻-温度测试对材料的微观组织和热敏特性进行了表征，研究了晶界处应力对所制陶瓷材料居里温度(t C )的影响，发现通过构建更多的氧八面体结构来减小晶界应力有助于提高居里温度，并制出了居里温度为137℃的无铅PTC元件。
채용고상법제비료참잡(K0.5Bi0.5)TiO3（KBT）적태산패기무연PTC도자재료(K0.5Bi0.5)xBa(1–x)TiO3。이용X사선연사、소묘전자현미경、전조-온도측시대재료적미관조직화열민특성진행료표정，연구료정계처응력대소제도자재료거리온도(t C )적영향，발현통과구건경다적양팔면체결구래감소정계응력유조우제고거리온도，병제출료거리온도위137℃적무연PTC원건。
The (K0.5Bi0.5)TiO3 (KBT) doped lead-free BaTiO3-based PTC thermistor materials (K0.5Bi0.5)xBa(1–x)TiO3 were prepared by solid state reaction method. Phase component and microstructure of prepared materials were investigated by X-ray diffraction and scanning electron microscope. The electrical properties were studied by resistance-temperature measurement system. The effects of boundary stress on Curie temperature (tC) of the prepared ceramics were discussed. The results show that the decrease of boundary stress by building more oxygen octahedrons is conducive to raise t C and the lead-free PTC components with tC of 137℃ were prepared.