本文计算了Ca3TaAl3Si2O14(CTAS)和Ca3NbAl3SiO14(CNAS)压电晶体的X,Y和Z切型的声表面波速度、机电耦合系数.计算结果表明:CTAS和CNAS机电耦合系数最高可达1.04%,是石英晶体(最大0.3%)三倍多,而CTAS晶体的声表面波速度(最小值约为3070 m/s)比石英(最小值为3200 m/s)小4.0%.给出声表面波特性比较好的切型,为CTAS和CNAS的声表面波应用提供了理论依据.
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