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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.
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TL;DR: In this article, it was shown that soft lead zirconate titanate (PZT) ceramics exhibit a nonsymmetric deformation behavior, where the tensile strains exceed the compressive strains for a given stress level.
Abstract: Soft lead zirconate titanate (PZT) ceramics exhibit a nonsymmetric deformation behavior, where the tensile strains exceed the compressive strains for a given stress level. This phenomenon affects the strains in bending tests. In addition to the normally determined bending strain that is measured by the curvature of a specimen, an additional length extension occurs that can be used as a high-sensitive indicator for the occurrence of the nonsymmetric behavior. Furthermore, it will be shown that the pure tensile and compression behavior may be derived from bending tests.
57 citations
Abstract: Mechanisms and magnitudes of the large piezoelectric response observed in lead-free (1-x) BiFeO3-xBaTiO3 (BFBT) ceramics are investigated. Preceding studies reported significant strain hysteresis and hard ferroelectric behavior in BFBT leading to a small low-field piezoelectric coefficient, instability of the poled domain state, and rapid degradation of piezoelectric properties. The current investigation shows that under application of a suitable direct current (dc) bias to stabilize the ferroelectric phase low- and high-field piezoelectric coefficients (d33) of 150 pC/N and 250 pC/N are observed for the composition 0.67BiFeO3-0.33BaTiO3 + 0.1 wt% MnO with a Curie temperature of 605 °C. Such enhancement of electromechanical properties under dc bias is in contrast to the expected behavior in traditional piezoelectric materials such as soft lead zirconate titanate (PZT). The large piezoelectric coefficients confirm strong intrinsic and extrinsic contributions to the piezoelectric response in BFBT, which coupled with high ferroelectric Curie temperature TC > 500 °C, suggests BFBT-based materials as promising lead-free alternatives to PZT piezoceramics.
57 citations
TL;DR: In this article, an epitaxial lead zirconate titanate (PZT) thin film with a thickness of 500 nm on SrRuO3/SrTiO3 was presented.
Abstract: Deposition of a hydrothermal method has a number of advantages; low deposition temperature, high-purity, deposition on a three-dimensional structure, and a large thickness. The present paper investigates the improvement of an epitaxial lead zirconate titanate (PZT) thin film deposited via hydrothermal synthesis. The critical parameter contributing to the film morphology was revealed to be the holding position of the reaction solution during deposition. In addition to this improvement, the SrRuO3 bottom electrode was confirmed to be able to withstand high alkali concentrations during the hydrothermal reaction. A hydrothermal synthesis time of 24 h yielded a PZT film with a thickness of 500 nm on SrRuO3/SrTiO3 (100) at 150 °C. The remanent polarization 2Pr and coercive electric field were 38.4 μC/cm2 and 21.8 kV/cm, respectively.
57 citations
TL;DR: In this paper, it was shown that conductive cracks driven by electric fields can be described by the same fracture mechanics concepts used for mechanical loads, but with a much higher fracture toughness.
Abstract: Fracture of piezoelectric materials can be caused by either mechanical loads or by electric fields. It is shown in lead zirconate titanate ceramics that conductive cracks driven by electric fields can be described by the same fracture mechanics concepts used for mechanical loads, but with a much higher fracture toughness. The electrical fracture toughness GICE=223.7±17.0 N/m (95% confidence) is 25 times higher than the mechanical fracture toughness GICM=8.7±0.4 N/m (95% confidence). This is due to the greater energy dissipation that is possible under electric loading but not possible under mechanical loading in the brittle ceramics of lead zirconate titanate.
57 citations
TL;DR: In this article, both linear and annular arrays were produced by robotically depositing a concentrated PZT gel-based ink to create high-aspect-ratio pZT elements (thickness ∼ 130 μm and height ∼ 1-2 mm) of varying pitch (∼250-410 μm).
Abstract: Lead zirconate titanate (PZT) arrays for ultrasonic sensing applications in the 2–30-MHz frequency range were fabricated by robocasting, a directed colloidal assembly technique. Both linear and annular arrays were produced by robotically depositing a concentrated PZT gel-based ink to create high-aspect-ratio PZT elements (thickness ∼ 130 μm and height ∼1–2 mm) of varying pitch (∼250–410 μm). The arrays were densified and infiltrated with an epoxy resin to fabricate PZT–polymer composites with 2–2 connectivity. Their dielectric and piezoelectric constants were measured and compared with values obtained for bulk PZT and those predicted theoretically.
56 citations