A combined diffraction (XRD, electron and neutron) and dielectric study of Na3MoO3F3

For the dielectric measurements, Na3MoO3F3 ceramics were cut and polished down to a disc with a thickness of 0.5 mm and a diameter of 4.79 mm. Gold electrodes were then sputtered onto both surfaces of the sample. Its polarisation hysteresis loop was characterised by a ferro- and piezo-electric measuring system (TA Analyser 2000, aixACT). The temperature dependence of the dielectric constant and the dissipation factor of Na3MoO3F3 was investigated at 10KHz by a high precision LCR meter (3522, Hioki) between room temperature and 180oC using a scan rate of 5oC/min

Effect of Electric Field and Temperature on Average Structure and Domain Wall Motion in 0.93Bi 0.5

In situ neutron powder diffraction patterns and dielectric spectra of 0.93Bi0.5Na0.5TiO3-0.07BaTiO3 ceramic were investigated under different electrical fields and temperatures. An electric-field-induced phase transition from metrically cubic to metrically tetragonal, associated with strong domain wall motion, occurs. Such induced phase and domain wall motion are unchanged until the high-temperature phase transition occurs from metrically tetragonal to metrically cubic. All these changes are irrelevant to the observed depolarization temperature (75°C). The depolarization behaviour is thus suggested to be associated with the local structure caused by the octahedral tilt twinning disorder

Structure, dielectric and ferroelectric properties of lead free (K,Na)(Nb)O3-xBiErO3 piezoelectric ceramics

The effect of BiErO3 (BE) as a doping material on the structural, dielectric and ferroelectric properties of (KNa)NbO3 ceramics was explored in this research. Co-existence of two phase regions was confirmed in the composition range at x = 0.5% and x = 1.0%. The addition of BE content led to a decrease of the grain size and the ceramics became denser. Bulk P–E hysteresis loops were obtained with a maximum polarization of P max = 30.56 µC/cm2 and a remnant polarization of P r = 25.10 µC/cm2, along with a coercive field of E c ~ 11.26 kV/cm. The results revealed that a field strain value of ~ 0.26 for x = 0.5% of BE substitution was attained. This presents outstanding piezoelectric and dielectric properties