Comparative Studies on Electronic Structures and Surface Acoustic Wave Properties of (Ca, Sr, Pb)3Ga2Ge3O14 Piezoelectric Crystals

Wenqi Huang, Hong Yang


The electronic structural and surface acoustic wave (SAW) properties of Ca3Ga2Ge3O14 (CGG), Sr3Ga2Ge3O14 (SGG) and Pb3Ga2Ge3O14 (PGG) crystals have been investigated. The first-principle calculations show that CGG and SGG have similar electronic structure properties, the remarkable difference between PGGand another two crystals is the absence of lower part of valence band. Both the calculated effective charges and bond populations show that there is considerable covalency between cations and O atom. The calculated SAW results show that PGG has the lowest velocities because of its highest density, SGG has the highest electromechanical coupling coefficients, CGG and SGG have more zero power flow angles and negligible diffraction angles than PGG crystal. Some promising cut-types such as Y-cut 148o of SGG, X-cut 154o of CGG and Y-cut 0o of PGG have been selected for their SAW applications.

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Applied Physics Research   ISSN 1916-9639 (Print)   ISSN 1916-9647 (Online)   Email:

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