【摘要】 采用固相法制备了Mn改性的CaBi₄Ti₄O₁₅（CBT+xmol%MnCO₃）层状压电陶瓷.介电温谱显示所有样品居里点在780℃附近,并且发现该材料在110K处有一介电弛豫峰.Mn的加入显著降低了高温下的介电损耗,剩余极化轻微降低,室温介电常数从173减小到162,同时机械品质因子由2700增加到4400,显示了硬性掺杂的效果.在100～600℃范围内,x=1.0的样品比纯组分的电阻率提高了一个数量级以上,500℃的电阻率提高了约2个数量级（10⁸Ω·cm）,电阻率对温度的Arrhenius拟合由两段过渡到三段,压电系数d₃₃由7提高到14.5.实验结果表明,Mn改性的CBT在高温传感器等领域具有应用前景.更多还原

【Abstract】 Mn-modified CaBi₄Ti₄O₁₅ （CBT+x mol% MnCO₃） layer-structured piezoelectric ceramics were prepared by the solid state reaction technology.All samples have the same Curie temperature of 780℃,but the dielectric loss at high temperature is remarkably lowered by Mn addition.With increasing content of Mn,the remnant polarization is slightly decreased;the dielectric constant at room temperature decreases from 173 to 162:and the mechanical quality factor increases from 2700 to 4400. The piezoelectric constant d₃₃ is enhanced from 7 to 14.5.The resistivity of 1.0mol% Mn modified sample is found to be 10⁸Ω·cm at 500℃,50 times higher than that of pure CBT.The Arrehenius plot of Mn-modified CBT is fitted by 3 straight lines,while that of pure CBT is fitted by 2 straight lines. The results suggest that the Mn modified CBT is a potential material for high temperature sensing application.更多还原