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This paper reported the development of lead-free Sr2-xCaxNaNb5O15(SCNN, x=0.1) piezoelectric ceramics with tungsten bronze structure that are potentially served as sensors in sensing patches. These ceramics were prepared using the conventional solid-state synthesis method, and their dielectric, ferroelectric and piezoelectric properties were investigated. The dual-stage sintering was used to density SCNN ceramics, i.e. prefiring at 1240°C for 6h and finally firing at 1280-1360°C for 25h. The sample sintered at 1320°C exhibited the maximum density (4.96g/cm3) and thus had the maximum dielectric constant (1455) and the Curie temperature (288°C). The spontaneous polarization and the piezoelectric constant of this sample were 7.9μC/cm2 and 118pC/N, respectively. The electric properties of SCNN were improved by doping with 1 mass% La2O3, with the dielectric constant of 1662, the Curie temperature of 298°C, spontaneous polarization of 10.7μC/cm2 and the piezoelectric constant of 138pC/N, respectively. The good piezoelectric properties of the SCNN-based ceramics indicate that they are good candidates for sensor applications.

Special Issue Ceramics Integration. Preparation of Lead-Free Sr2-xCaxNaNb5O15(x=0.1)-Based Piezoceramics with Tungsten Bronze Structure.