Preparation method of bismuth ferrite-lead titanate-bismuth magnesium niobate ternary system high-temperature piezoelectric ceramic

Abstract

The invention belongs to the field of piezoelectric ceramic materials, and particularly relates to a preparation method of bismuth ferrite-lead titanate-bismuth magnesium niobate ternary system high-temperature piezoelectric ceramic. The chemical formula is (1-x-y) BiFeO3-xPbTiO3-yBi (Mg2 / 3Nb1 / 3) O3, x and y are molar weights, and x is more than or equal to 0.20 and less than or equal to 0.40; 0.01 < = y < = 0.10; the auxiliary component is mBi2O3 + nPbO + zMnO, m, n and z are the mass percent of the total formula, and m is larger than or equal to 0 and smaller than or equal to 0.10; 0 < = n < = 0.10; 0 < = z < = 0.10. The preparation method comprises the following steps: S1, weighing the raw materials; s2, carrying out primary ball milling; step S3: drying; s4, performing solid-phase synthesis; step S5, carrying out secondary ball milling; step S6, granulating and forming; step S7, glue discharging; step S8; and step S9. The sintering temperature of a system can be reduced, ceramic densification is promoted, cracking and pulverization are avoided, the ceramic has the good sintering characteristic, the c / a ratio of the system is reduced, the material is easy to polarize, the ceramic obtains the large piezoelectric coefficient under the condition that the high Curie temperature is guaranteed, the insulativity and temperature stability of the material are improved, and the service life of the material is prolonged. And practical application of devices at high temperature is facilitated.

Description

technical field [0001] The invention belongs to the field of piezoelectric ceramic materials, and in particular relates to a preparation method of a bismuth ferrite-lead titanate-bismuth magnesium niobate ternary system high-temperature piezoelectric ceramic. Background technique [0002] In order to obtain piezoelectric ceramics with high Curie temperature and piezoelectric properties, researchers from all over the world have carried out extensive research. At present, the common piezoelectric ceramic materials with high Curie temperature are divided into piezoelectric ceramics with perovskite structure and non-perovskite structure from the structure. [0003] Although non-perovskite bismuth-containing layered and tungsten bronze structure piezoelectric ceramics have a high Curie temperature, their own structure limits their piezoelectric activity, resulting in a low piezoelectric coefficient. This limits its application in practical devices, especially in some occasions t...

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Problems solved by technology

[0009] The technical problem to be solved by the present invention is to solve the problem that the high Curie temperature and the high voltage voltage coefficient of the existing bismuth ferrite-lead titanate based piezoelectric ceramics cannot be compatible at the same time. The present invention provides a A bismuth ferrite-bismuth magnesium niobate-lead titanate ternary system high-temperature piezoelectric ceramic material and a preparation method thereof, by introducing the third component Bi(Mg 2 / 3 Nb 1 / 3 )O 3 , Bi(Mg 2 / 3 Nb 1 / 3 )O 3 With a perovskite structure, it can reduce the square distortion c / a of the lattice, reduce the coercive field, promote the movement of the ferroelectric domain under the applied electric field, and improve the piezoelectric performance; in addition, Bi(Mg 2 / 3 Nb 1 / 3 )O 3 The addition of iron ions can also inhibit the price change of iron ions and enhance the insulation of the material

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