SU1318576A1 - Piezoelectric ceramic material - Google Patents

Abstract

This invention relates to piezo-ceramic materials with a high Curie temperature. It can be used in piezotechnique to manufacture piezoelectric elements in vibration transducers that are stable over a wide temperature range. The aim of the invention is to lower the synthesis temperature by 80 ° C, sinter by 60-80 ° C and increase the Curie temperature. To do this, the basic composition is additionally introduced previously synthesized in the amount of 3.86-5.60 wt.% - and chromium oxide in the amount of 0.2-0.3 wt.%. The proposed piezoelectric ceramic material has the following characteristics: density 6.37 - 6.48 g / cm, dielectric constant 116-135, dielectric loss 0.0034-0.0075, piezomodul d,

Description

The invention relates to piezoceramic materials with a high phase transition temperature and can be used in the electronic and radio engineering industry, in particular for vibration transducers operating in a wide temperature range.

The purpose of the invention is to reduce the temperature of synthesis and sintering of ceramics.

The piezoceramic material was obtained according to the following technology: grinding of a mixture of grade x oxides. conducted in a drum drum for 20 hours in an aqueous medium.

Compounds and Bi, W06 are prepared and synthesized separately. SaB14TZO at 780 ° C for 2 hours, at 700 ° C for 2 hours. The resulting compounds are then ground and mixed with the addition of Cg O. The grinding of the mixture is carried out in an agate mill for A h in an isopropyl alcohol medium. The mixture obtained is synthesized for 2 h and ground. The dried material is pressed into disks

116 125 135 0.0034 .0.0046 0.0064

14.2

13.0 12.8

diameter 12 mm, thickness 2 mm. Firing, depending on the chemical composition, takes place at 1080-1100 ° C.

Electrodes for measuring electrophysical properties are deposited by vacuum sputtering of aluminum on a GUP-4 unit. The samples are polarized at 150 ° C and at a intensity of 45-50 kV / cm.

The chemical composition of ceramics is given in Table 1. The results of determining the complex of electrophysical properties are given in Table 2.

Claims (1)

t5 claims A piezoelectric ceramic material, including, and an additive, characterized in that, in order to reduce the synthesis and sintering temperature, it contains as an additive in the following ratio of components, wt,%: Cr, 0, Bijwog CaBi.4Tl, 0.5 0.20-0.30 3.86-5.60 Else Table 1 Table 2 135 0.0064 12.8 123-167 0.004-0.015 five, Mechanical goodness ness, d „423024902817 Curie temperature, ° С875870870 Temperature synthesis, ° C 820820 820 900 13185764 Continuation of table 2