Home  About us  Contact
 

Lead Titanate (lead + titanate)

Distribution by Scientific Domains
Polymers and Materials Science80%

Selected Abstracts

Giant Electric Field Tuning of Magnetism in Novel Multiferroic FeGaB/Lead Zinc Niobate,Lead Titanate (PZN-PT) Heterostructures

ADVANCED MATERIALS, Issue 46 2009
Jing Lou
A novel multiferroic heterostructure consisting of a FeGaB thin film and a PZN-PT single crystal slab shows giant tunability of the ferromagnetic resonance (FMR) frequency of the heterostructure by electric field (see figure). The overall electric-field-induced FMR frequency change of 5.82 GHz is the largest reported so far. FeGaB/PZN-PT multiferroic heterostructures are promising candidates for wide-band electrostatically tunable microwave devices. [source]

Sintering of Lead Titanate Using a Spark-Plasma-Sintering Technique

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 4 2004
Kazuyuki Kakegawa
Lead titanate (PbTiO3) is difficult to sinter without additives, even when a spark-plasma-sintering technique is applied. The high tetragonality, c/a, of PbTiO3 causes destructive strain after sintering. We found that a sintered body of PbTiO3 could be obtained, when the PbO/TiO2 value was <0.9. However, decreasing the ratio did not increase the bulk density; rather, it caused a decrease in the grain size. The mechanical strain that resulted from the phase change from cubic, at the sintering temperature, to tetragonal, at room temperature after the sintering, was released by the decrease in the grain size. [source]

Calcium- and Lanthanum-Modified Lead Titanate (PCLT) Ceramic and PCLT/Vinylidene Fluoride-Trifluoroethylene 0-3 Nanocomposites

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 9 2000
Q. Q. Zhang
Calcium- and lanthanum-modified lead titanate (PCLT) powders with size in the nanometer range were prepared by a sol,gel process. The PCLT gel was annealed at 850°C to produce powder with an average particle diameter of 80 nm. A dense and fine-grained PCLT ceramic, with grain size of ,0.7 ,m, was prepared by sintering the sol,gel-derived powder at 1150°C. The piezoelectric and pyroelectric properties of the PCLT ceramic varied linearly with the degree of poling in the ceramic. PCLT/vinylidene fluoride-trifluoroethylene (P(VDF-TrFE)) 0-3 nanocomposites with PCLT volume fractions of 0.1,0.5 were fabricated, using PCLT powders imbedded in a P(VDF-TrFE) matrix. The ceramic data were used to model the piezoelectric and pyroelectric properties of the PCLT/P(VDF-TrFE) composites, and good agreements were obtained. [source]

A novel route to perovskite lead titanate from lead and titanium glycolates via the sol,gel process

APPLIED ORGANOMETALLIC CHEMISTRY, Issue 12 2006
N. Tangboriboon
Abstract Pure perovskite lead titanate powder (PbTiO3) is successfully produced via the sol,gel process using lead and titanium glycolates as starting precursors and has been synthesized by the oxide one spot synthesis process. The obtained lead titanate is of the tetragonal form of the perovskite phase, with high purity and nearly zero moisture content. From high-resolution mass spectra, the XRD technique, Raman-FTIR and TGA-DTA analysis, the lead,titanium glycolates undergo sol,gel transition through the formation of PbOTi bonds. From the SEM micrographs, the PbTiO3 particle shape transforms from an agglomerate sphere to a needle and fiber-like shapes as the calcination temperature is varied above Tc. The corresponding molecular structural transformation, from the tetragonal form to the cubic form, occurs at 430 °C. The lead titanate powder calcined at 300 °C for 3 h has the highest dielectric constant and electrical conductivity values, namely 17470 and 1.83 × 10,3, respectively. Copyright © 2006 John Wiley & Sons, Ltd. [source]