The strong temperature dependence of dielectric and piezoelectric properties is a big'bottleneck'for practical applications of KNN-based piezoceramics.In order to resolve this problem,Ca_(0.5)Sr_(0.5)TiO_(3)(C...The strong temperature dependence of dielectric and piezoelectric properties is a big'bottleneck'for practical applications of KNN-based piezoceramics.In order to resolve this problem,Ca_(0.5)Sr_(0.5)TiO_(3)(CST)is doped into(Na_(0.53)K_(0.4)0_(7)Li_(0.063))Nb0.937Sb0.063O3(NKLNS)ceramics.The thermal stability of s11E and k31 in the temperature range from−50℃to 200℃for ceramics with 1.0 and 1.5 mol%CST is raised in comparison with ceramics without CST.Ceramics with 1.5 mol%CST exhibit high piezoelectric properties(d33=202 pC/N,kp=44%)and low dielectric loss(2%)at room temperature.The excellent piezoelectric properties,which are comparable to conventional PZT ceramics,indicate that these ceramics are promising candidates for lead-free piezoelectric applications.展开更多
基金by the National Natural Science Foundation of China under Grant No 50802038the Technology Research Foundation of Shandong Province under Grant No 2008GG10003011.
文摘The strong temperature dependence of dielectric and piezoelectric properties is a big'bottleneck'for practical applications of KNN-based piezoceramics.In order to resolve this problem,Ca_(0.5)Sr_(0.5)TiO_(3)(CST)is doped into(Na_(0.53)K_(0.4)0_(7)Li_(0.063))Nb0.937Sb0.063O3(NKLNS)ceramics.The thermal stability of s11E and k31 in the temperature range from−50℃to 200℃for ceramics with 1.0 and 1.5 mol%CST is raised in comparison with ceramics without CST.Ceramics with 1.5 mol%CST exhibit high piezoelectric properties(d33=202 pC/N,kp=44%)and low dielectric loss(2%)at room temperature.The excellent piezoelectric properties,which are comparable to conventional PZT ceramics,indicate that these ceramics are promising candidates for lead-free piezoelectric applications.
