SU1460057A1 - Piezoceramic material - Google Patents

Abstract

The invention relates to piezoceramic materials and can be used to make piezoelectric filters, microwave resonators, and other devices combining high piezoelectric properties and low dielectric losses. To increase the piezomodul dj, and to decrease the dielectric constant and sintering temperature, the addition of barium and bismuth oxides are included in the material as BaBiO, in the following ratio, wt.%: (Pbo ,, 5Lao.os) TiO, 85-95; BaBiO, 5-15. The material obtained by conventional ceramic technology at a temperature of 1140-1160 ° C for 1 h has the following characteristics: 240-250; tp, t 0.008-0.010; d3, -10 90-130 Cl / H; 400 ° C; To 16.20% of 2 tabLo a (O

Description

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The invention relates to the field of piezoelectric ceramics and can be used to make piezoelectric. filters, microwave resonators and other devices that require a combination of large piezoelectric effect, low dielectric losses and temperature stability properties.

The purpose of the invention is to increase the d33 module and reduce the dielectric constant and sintering temperature

For the manufacture of piezoceramics, oxides of the grade of analytical grade are used. Titanate lead-lanthanum is synthesized in

for 3 hours, barium bismuthate - for 2 hours at 780 C. After the synthesis, the grinding of briquettes is carried out in a drum drum in isopropyl alcohol for 20 hours. The slurry is dried at 150 ° C for 5 hours, weighed according to the composition synthesized lead titanate and bismuthate barium. The components are mixed in a shmov drum in an environment of isopropyl alcohol for 20 hours. The dried slip is pressed into disks with a diameter of 12 mm and a thickness of 2 mm. A 3% aqueous polio solution is used as a binder.

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Vinyl alcohol Sintering of materials, depending on the composition, was carried out at 1140–1160 ° C for 1 hour. Electrodes were deposited on the ground samples by sputtering aluminum in vacuum. The polarization is carried out in a polysiloxane liquid at 15 ° C for 4 hours at a field intensity of 35-50 kV / cm. The dielectric properties are measured at a frequency of 10 Gzo.

The chemical composition of the materials is given in Table 1, their properties, as well as the properties of a known material - in,

Claims (1)

Invention Formula Piezoceramic material based on (Pbg qg-Laooj) TiO, with additives BaO And BijO, characterized in that, in order to increase the d 53 piezomodules and decrease the dielectric constant and sintering temperature, it contains an additive in the form of BaV103 in the following ratio of components , maso%: (Pbo ,, Lao.o5) TiO, 85-95 BaBiO, 5-15 f a b p k ii, and 1 Table 2