In this investigation we show that the dielectric, ferroelectric and piezoelectric properties of stoichiometric 0.57Pb(Sc1/2Nb1/2)O3– 0.43PbTiO3 (0.57PSN–0.43PT) ceramics prepared by mechanochemical synthesis are comparable or even better than the properties of 0.57PSN–0.43PT ceramics with Nb doping, which was proposed to enhance the electrical properties. Here, the stoichiometric ceramic was sintered to 97% of theoretical density at a temperature of 1000 °C, which is 200–300 °C lower than previously reported. The highest d33, kp and kt were measured for ceramics poled at an electric field of 3 kV/mm. The dielectric constant, remnant polarization, piezoelectric coefficient, coupling coefficients kp and kt of the ceramics prepared by mechanochemical synthesis were 2200, 43 microC/cm2, 570 pC/N, 0.71 and 0.56, respectively.
COBISS.SI-ID: 25219623
The work was a systematic study of the influence of the sintering conditions on the structural and electrical properties of 0.57Pb(Sc0.5Nb0.5)O3-0.43PbTiO3 ceramics prepared from mechanochemically activated powder. Three or even more contributions competed for influence on the functional properties of the ceramics, i.e., the density, the grain size and the phase composition. However, all these contributions combined in such a way that the best functional properties were obtained for the ceramics sintered at 1000 °C for 8 h.
COBISS.SI-ID: 26309927
The objective of this work was to examine linear thermal expansion of virgin and poled 0.57Pb(Sc0.5Nb0.5)O3-0.43PbTiO3 ceramics between 30 °C and 600 °C by contact dilatometry. The linear thermal expansion coefficient is one of the key material parameters needed for the successful design of layered structures, such as sensors, actuators and other thick-film devices.
COBISS.SI-ID: 26695463
Dielectric properties of Pb(Sc0.5Nb0.5)O3 (PSN) ceramic system, prepared from mechanochemically activated powder, were studied in a broad temperature range of 150–750 K. Various distinctive contributions were recognized in the detected reponse. A typical relaxor dispersive maximum, accompanied by a sharp dielectric anomaly showing a hysteretic behavior, reveals that developed disordered PSN ceramics undergoes a spontaneous relaxor-to-ferroelectric phase transition, even in zero electric field. At high temperatures, a strong dielectric dispersion due to the Maxwell–Wagner-type contributions of interface layers between the sample and contacts governs the detected response.
COBISS.SI-ID: 26952743
In the contribution the processing and properties of piezoelectric and electrocaloric thick films is explained. Additionally, an approach to preparing selfstanding, large displacement actuators is shown and discussed.
COBISS.SI-ID: 26116647