Showing papers on "Lead zirconate titanate published in 1975"
Patent•
NEC1
TL;DR: In this article, a fine crystalline powder, from 0.02 to 0.2 micron in average particle size, of a composition Pb(Zr.Ti)O3 was produced by preparing an acidic aqueous solution of the constituent metallic ions, neutralizing the solution to provide a suspension of hydroxides of the metals, and subjecting the suspension to hydrothermal reaction at 150°-300°C.
Abstract: Fine crystalline powder, from 0.02 to 0.2 micron in average particle size, of a composition Pb(Zr.Ti)O3. Parts of Zr and Ti of the composition may be substituted for with Mn and Sb, Nb, and/or Ta. The powder is produced by preparing an acidic aqueous solution of the constituent metallic ions, neutralizing the solution to provide a suspension of hydroxides of the metals, and subjecting the suspension to hydrothermal reaction at 150°-300°C. The powder provides piezoelectric ceramics of a high sintered density without resorting to hot pressing.
28 citations
TL;DR: In this paper, the authors used a reciprocity coupler to measure g33 and KT33 accurately as a function of one-dimensional stress to high values of stress, and found that the peaks are due to a phase transition from the ferroelectric tetragonal to the Ferroelectric rhombohedral state.
Abstract: Highly accurate data obtained from measurements on three different formulations of lead zirconate titanate piezoelectric ceramic material show the dependence of g33, d33, and KT33 on one‐dimensional stress (applied parallel to the direction of polarization) to high values of stress (0–400 MPa). The constants for one type of ceramic vary with stress less than those of the other two types for high values of stress. A peak in the curve of tanδ as a function of T3 for two types of materials is a function of the material, and it is believed that the peaks are due to a phase transition from the ferroelectric tetragonal to the ferroelectric rhombohedral state. The experimental feasibility and practicability of using a reciprocity coupler to measure g33 and KT33 accurately as a function of one‐dimensional stress to high values of stress has been established.
26 citations
TL;DR: In this article, the disappearing phase method was used to determine the extent of the solid-solution region of the PLZT system for conventionally sintered ceramics prepared at 1100° and 1300°C in a PbO atmosphere provided by pbZrO3.
Abstract: The disappearing-phase method was used to determine the extent of the solid-solution region of the PLZT system for conventionally sintered ceramics prepared at 1100° and 1300°C in a PbO atmosphere provided by pbZrO3. A decrease in the firing temperature from 1300° to 1100°C lowers the solubility limit by 5 to 8 at.% La. Beyond the limits of solubility, additional La forms La2Zr2O7 and/or La2Ti2O7. The limit determined by the disappearing-phase method (1300°C firing) is compared to values determined by the parametric method. The Curie temperature is stabilized at 5 at.% La for modified PbZrO3 (1300°C firing).
11 citations
TL;DR: In this paper, the velocities of ultrasound waves in helium, argon, and nitrogen gases have been measured at 25°C under high pressure up to 15 KB for helium and nitrogen, and 13 KB for argon where it solidifies, using a single-pulse ultrasonic technique.
Abstract: Velocities of ultrasound waves in helium, argon, and nitrogen gases have been measured at 25°C under high pressure up to 15 KB for helium and nitrogen, and 13 KB for argon where it solidifies, using a single-pulse ultrasonic technique. Lead zirconate titanate ceramics with fundamental frequencies of 1 and 2 MHz are used as transducers. The observed velocities of ultrasound waves are in good agreement with the previous data. The ratios of specific heats are also calculated.
10 citations
5 citations
TL;DR: The method of differential spectrophotometr ic determination of t i tanium as well as the complexometrically determinat ion of lead and strontium in lead zirconate titanate (LZT) with bismuth and stronium additives have been described in this paper.
Abstract: Since var ious additives are added to lead zirconate titanate (LZT) in order to achieve the specified proper t ies of the ceramic mater ia l , it is necessa ry to modify the method of analysis . The method of differential spectrophotometr ic determination of t i tanium as well as the complexometr ic determinat ion of lead and strontium in LZT with bismuth and strontium additives have been descr ibed ea r l i e r [1, 2].