For the purpose of researching the mechanisms of losses in piezoelectrics, three dissipation factors, which are dielectric, mechanical and piezoelectric losses, are introduced to describe the losses.

• 为研究压电材料中三种不同的损失,引入三种耗散因子(介电耗散因子、弹性耗散因子和压电耗散因子)分别用于描述介电损失、机械损失和压电损失的大小。