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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, the fabrication process to obtain 1-3-type porous lead zirconate titanate (PZT) ceramics with one-dimensional pore channels by using tert-butyl alcohol-based directional freeze-casting method was described.
Abstract: Porous lead zirconate titanate (PZT) ceramics are of great interest for hydrophones and medical imaging applications. The 0–3 type and 3–3 type porous PZT ceramics have been extensively discussed these years but the 1–3 type PZT ceramics have seldom been reported. This paper describes the fabrication process to obtain such 1–3 type porous PZT ceramics with one-dimensional pore channels by using tert-butyl alcohol-based directional freeze-casting method, and presents analysis of both microstructure and functional properties. The 1–3 type porous PZT ceramics with porosity ranging from 28.1% to 68.7% were fabricated by adjusting initial solid loading. With the increase of porosity, relative permittivity (ɛr) decreased slightly and longitude piezoelectric coefficient (d33) exhibited only a small decline, which could be attributed to the special 1–3 type porous structure. The resultant samples with 61.3% porosity possessed a high value of hydrostatic figure of merit, >100 times higher than that of dense materials. The acoustic impedance (Z) showed a linear dependence on porosity with the lowest magnitude reaching 1.3 MRayls (106 kg·(m2·s)−1), matching very well with biological tissue or water.
48 citations
TL;DR: In this article, the authors investigated magnetoelectric coupling at low frequencies and at x-band in layered samples containing zinc substituted lithium ferrite and lead zirconate titanate (PZT).
48 citations
TL;DR: A study of the adsorption of several surfactants onto lead zirconate titanate (PZT) powder was performed by thermogravimetric analysis as mentioned in this paper.
Abstract: A study of the adsorption of several surfactants onto lead zirconate titanate (PZT) powder was performed. The adsorption of oleyl alcohol, stearyl alcohol, oleic acid, and stearic acid onto PZT-5H powder (surface area = 2.58 m2/g) was measured by thermogravimetric analysis. Toluene was used as a solvent, and the solution concentrations were set at 50.0 g/L. It was found that the stearic acid adsorption onto the PZT-5H powder was highest, to the extent of 8.1 mg/m2. Trace amounts of stearyl alcohol adsorbed onto PZT, showing an adsorption of 0.8 mg/m2. Both oleyl alcohol and oleic acid showed no measurable adsorption. Once stearic acid was found to be a suitable surfactant for fused deposition of ceramics (FDC), the coating process was studied to further optimize the amount adsorbed. A total of six solution concentrations, varying from 5.0 to 70.0 g/L stearic acid in toluene, were tested. It was found that a solution concentration of 30.0 g/L stearic acid was sufficient to provide maximum coverage of the PZT surface. Increases in concentration beyond 30.0 g/L had no effect on the adsorption of the surfactant. PZT powder coated with stearic acid using this method was compounded with a proprietary thermoplastic binder formulation at 55 vol% PZT. Rheology measurements show that this material exhibits a viscosity adequate for FDC.
48 citations
TL;DR: In this article, an antiferroelectric-ferroelectric (AFEIn) phase was found to be stabilized from the rhombohedral FE state in the compositional series 100x/90/10 for x ≥ 0.02.
Abstract: Lanthanum-modified lead zirconate titanate ceramics Pb1−3/2xLax(Zr1−yTiy)O3 [PLZT 100x/100(1 − y)/100y] with Zr/Ti ratios close to the antiferroelectric-ferroelectric (AFE-FE) phase boundary were investigated by dielectric spectroscopy, Sawyer–Tower polarization techniques, and electron microscopy. An incommensurate antiferroelectric (AFEIn) phase was found to be stabilized from the rhombohedral FE state in the compositional series 100x/90/10 for x ≥ 0.02. The La content required to induce the AFEIn state increased as the Ti content was increased. For 100x/85/15, a state with relaxor-like dielectric behavior and nanodomains was observed to develop with increasing La content; however, the double-loop-like P-E curves were suggestive of antiferroelectric behavior. Investigations for the composition 6/85/15 revealed the formation of nanodomains from the AFEIn modulation, where the size of the nanodomains equaled the value of the AFEIn modulation wavelength. For this composition, P-E studies revealed double hysteresis characteristics, whereas dielectric investigations revealed relaxor-like behavior. It is suggested that the order within the nanodomain state may be antipolar over a range of compositions in high La content rhombohedral PLZT ceramics.
48 citations
TL;DR: Very thin lead-zirconate-titanate films, 500 A or less in thickness, have been prepared on Pt-Ti metallized silicon wafers by a solgel processing technique as mentioned in this paper.
Abstract: Very thin lead‐zirconate‐titanate films, 500 A or less in thickness, have been prepared on Pt‐Ti metallized silicon wafers by a sol‐gel processing technique. Excellent ferroelectric, dielectric, and structural properties have been demonstrated. The maximum polarization and the remanent polarization at a switching voltage of 3 V on a film with a Zr/Ti ratio of about 50/50 are 33 and 12 μC/cm2, respectively. The capability of reaching a saturation polarization at a low voltage (∼3 V) on these films suggests that they are very attractive for use in radiation‐hard low‐voltage nonvolatile programmable random access memories.
48 citations