Investigation of Piezoelectric Properties in Ca-Doped PbBa(Zr,Ti)O3 (PBZT) Ceramics.

The perovskite-structured materials Pb0.75Ba0.251-xCax(Zr0.

Composition-Related Dielectric, Ferroelectric and Electrocaloric Properties of PbGeO Single Crystals Modified by Ba Ions.

In this paper, we studied some ferroelectric properties of archetypal oxide uniaxial ferroelectric single crystals of PbGeO modified by Ba ions. They include dielectric, DSC, ferroelectric polarization, and electrocaloric effect (ECE) measurements. The measurements show that increasing Ba doping considerably influences all the measured parameters, mainly by lowering the Curie temperature, gradually diffusing the phase transition, and decreasing values of polarization as well as the coercive field.

Ultrahigh Piezoelectric Strains in PbZrTiO Single Crystals with Controlled Ti Content Close to the Tricritical Point.

Intensive investigations of PbZrTiO (PZT) materials with the ABO perovskite structure are connected with their extraordinary piezoelectric properties. Especially well known are PZT ceramics at the Morphotropic Phase Boundary (MPB), with x~0.48, whose applications are the most numerous among ferroelectrics.

First experimental evidence of the piezoelectric nature of struvite.

In this paper, we present the first experimental evidence of the piezoelectric nature of struvite (MgNHPO·6HO). Using a single diffusion gel growth technique, we have grown struvite crystals in the form of plane parallel plates. For struvite crystals of this shape, we measured the piezoelectric coefficients d and d.

Transparent EuTiO films: a possible two-dimensional magneto-optical device.

The magneto-optical activity of high quality transparent thin films of insulating EuTiO (ETO) deposited on a thin SrTiO (STO) substrate, both being non-magnetic materials, are demonstrated to be a versatile tool for light modulation. The operating temperature is close to room temperature and allows for multiple device engineering. By using small magnetic fields birefringence of the samples can be switched off and on.

Phase transitions and interrelated instabilities in PbHfO3 single crystals.

PbHfO(3) is investigated theoretically and experimentally with respect to possible precursor effects starting in the paraelectric phase far above the cubic to tetragonal phase transition temperature. The theoretical modeling within the polarizability model predicts a giant softness of the system with spatially large polar and antiferrodistortive domain formation which compete with each other. These predictions are substantiated by the experiments, where the softness and the precursor effects are confirmed by birefringence, dielectric permittivity measurements and elastic properties by Brillouin scattering.