SU1169959A1 - Bismuth-potassium titanate-tungstate as hign-temperature ferropiezo electric material - Google Patents

Abstract

Bismuth-potassium titanate tungstate of composition K, for use as a high-temperature ferroelectric material.

Description

This invention relates to the chemistry of bismuth-containing layered compounds and relates to a layered perovskite-like compound by a PM of tanatum bismuth-potassium tungstate of composition which can be used as high-temperature ferroelectric piezoelectric materials.

Example. The original components are taken in the following ratio, g:

.aa.) 70,77

K SOZSH.CH.) 1,24

TSHg (osh) 11.42

WO (x.ch.) 16.57

Mixing and co-grinding of the starting oxides is carried out in a ball mill in isopropyl alcohol for 24 hours until particle size is 5-7 µm. After drying at 150–200 ° C, the mixture is pressed into briquettes of 20xt5x3 mm at a specific pressure of 1000 kg / cm and synthesized in air at 800–1130 ° C. The samples together with the furnace are cooled to room temperature, the briquettes are crushed and ground. The final product is a mix. receive in the form of powder.

The formation of the single-phase product K BigjTi Wj, 02; i was monitored using x-ray phase analysis. The determination of the parameters of an elementary cell was carried out using a DRON-2 x-ray diffractometer (Cu 1i radiation, Ni filter). Indication

a complete set of diffraction lines synthesized by K-, Bie .Ti.W-0 uk4v 0.5 tZ 2

The completion of the reaction of its formation and the absence of unreacted oxides or other foreign phases in the final product.

In tab. Figure 1 shows the characteristics of the crystal structure., Obtained at different synthesis temperatures and minimal overhead times. The parameters of the elementary cells of all samples coincide within the experimental error of determination.

In tab. 2 shows the main physicochemical properties of the obtained compound and the closest in structure of the known compound Big Ti.jWG | Q.

A: Consequently, the obtained compound KQj.Big Ti W2027 is a ferroelectric piezoelectric with a high Curie temperature and a higher value of the piezoelectric module and has a higher thermal resistance compared to jWO,.

Thus, the application of the invention allows to obtain a new layer composition - bismuth-potassium titanate-tungstate. The output of finished products is equal to 99.8% of the theoretically calculated. The compound can be used as a high-temperature ferroelectric-electric material.

Table 1

Not less than 6

"

,five

,five

,five

5.387iO, 004 5.413 ± 0.004 24.94 ± 0.02

5.386

24.96

5,412 24,97 5,389 5,417 24,96 5,412 5,386 24,98 5,419 5,393 24,98 5,416 5,390 5,391 5,417 24,97 Density D, g / cm Dielectric permeability 6 Dielectric losses tgS Curie temperature T, ° С Specific electrical resistance, Ohm / m Piezomodul dj, K / H Melting point, C Synthesis temperature, C

Table2 7, 118 0, 750 144 1120 1100, 8.25 2 105 0.007 11 700 2.4-10 18.-10 1160 800-1130

Claims (1)

Bismuth-potassium titanium tungstate of composition Βϊ ^ _? Τί ₄ Κ ₂ 0 ₂₇ for use as a high-temperature ferro piezoelectric material. with with ate with 1 1169959 2