This paper presents an analytical investigation of interfacial dissipation in piezoelectric block resonators. Interfacial dissipation is the loss of vibration energy at the interface between two successive layers in such devices. The physical mechanism of interfacial dissipation is examined within the framework of continuum mechanics. This dissipation is further mathematically formulated in terms of a stress jump across the interface and its accompanying interfacial slip. By assuming the block resonator is an ideal rectangular block, the expressions for interfacial dissipation in two typical types of piezoelectric block resonators are derived. The calculated results are validated by comparison with experimental data in the literature. For the first time, this analytical investigation not only sheds insight on how interfacial dissipation occurs but also provides design guidelines on reducing this dissipation.

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