A large piezoelectric voltage coefficient in aluminate-sodalite-type improper ferroelectric oxides

The dielectric and piezoelectric properties of aluminate-sodalite-type oxides, (Ca1-xSrx)(8)[AlO2](12){MoO4}(2) ((CS)AM-x), have been investigated in the present study. The variation of dielectric anomalies clarifies the phase diagram of (CS)AM-x over a composition range of x = 0.00-0.20 to suggest that a unique phase boundary like the morphotropic phase boundary (MPB) exists between x = 0.05 and 0.10. The piezoelectric voltage coefficient g(33) at room temperature has been found to culminate around the phase boundary with the value being greater than that for the conventional lead-free perovskite-type ferroelectric oxides. The present result sheds light on the development of eco-friendly piezoelectric-active materials with excellent functionalities.

Automated summary

The research reveals the presence of a unique phase boundary in (CS)AM-x within a specific composition range, with piezoelectric performance surpassing that of traditional lead-free perovskite-type ferroelectric oxides, suggesting a promising direction for the development of environmentally friendly piezoelectric-active materials.