Lead zirconate titanate

About: Lead zirconate titanate is a research topic. Over the lifetime, 7141 publications have been published within this topic receiving 150878 citations.

Comparison of electro‐optic lead‐lanthanum zirconate titanate films on crystalline and glass substrates

Abstract: It has been demonstrated that electro‐optically active lead zirconate titanate (PZT) and lanthanum‐modified lead zirconate titanate (PLZT) films derived from a water‐soluble acetate precursor system can be produced on glass substrates at a processing temperature of 600 °C through the initial application of a lanthanum‐modified lead titanate (PLT) buffer layer. A comparison of the electro‐optic behavior is made between films deposited onto glass and single‐crystal sapphire substrates when processed under the same conditions. Memory effects were observed in PZT 0/65/35 films, while quadratic behavior was exhibited by the PLZT 9/65/35 films consistent with expected bulk behavior. However, the measured birefringent shift in the films on glass substrates was lower than that on sapphire.

Ferroelectricity-free lead halide perovskites

Abstract: Direct piezoelectric force microscopy (DPFM) is employed to examine whether or not lead halide perovskites exhibit ferroelectricity. Compared to conventional piezoelectric force microscopy, DPFM is a novel technique capable of measuring piezoelectricity directly. This fact is fundamental to be able to examine the existence of ferroelectricity in lead halide perovskites, an issue that has been under debate for several years. DPFM is used to detect the current signals, i.e. changes in the charge distribution under the influence of the scan direction and applied force of the atomic force microscope (AFM) tip in contact mode. For comparison, (i) we use DPFM on lead halide perovskites and well-known ferroelectric materials (i.e. periodically poled lithium niobate and lead zirconate titanate); and (ii) we conduct parallel experiments on MAPbI3 films of different grain sizes, film thicknesses, substrates, and textures using DPFM as well as piezoelectric force microscopy (PFM) and electrostatic force microscopy (EFM). In contrast to previous work that claimed there were ferroelectric domains in MAPbI3 perovskite films, our work shows that the studied perovskite films Cs0.05(FA0.83MA0.17)0.95Pb(I0.83Br0.17)3 and MAPbI3 are ferroelectricity-free. The observed current profiles of lead halide perovskites possibly originate from ion migration that happens under an applied electrical bias and in strained samples under mechanical stress. This work provides a deeper understanding of the fundamental physical properties of the organic–inorganic lead halide perovskites and solves a longstanding dispute about their non-ferroelectric character: an issue of high relevance for optoelectronic and photovoltaic applications.

Uniaxial compressive stress dependence of the high-field dielectric and piezoelectric performance of soft PZT piezoceramics

Abstract: The influence of uniaxial prestress on dielectric and piezoelectric performance was studied for soft lead zirconate titanate piezoceramics High electric field induced polarization and longitudinal/transverse strain were measured at different compression preload levels of up to −400 MPa The parameters evaluated included polarization/strain outputs, dielectric permittivity, piezoelectric constants, and dissipation energy as a function of the mechanical preload and electric-field strength The results indicate a significant enhancement of the dielectric and piezoelectric performance within a certain prestress loading range At much higher stress levels, the predominant mechanical depolarization effect makes the material exhibit hardly any piezoeffect However, the enhanced performance achieved by a small stress preload is accompanied by an unfavorable increased hysteresis, and consequently, increased energy loss, which is attributed to a larger extrinsic contribution due to more non-180° domain switching induced by the combined electromechanical load