Preparation of textured piezoelectric ceramic using (001) oriented sheet-like SrTiO3 as template material

Abstract

Disclosed is a method for preparing texture piezoelectric ceramic film wherein the major chemical composition of the ceramics is Pb(Mg1 / 3Nb2 / 3)O3-xPbTiO3, x=0.429-0.538, containing 3-20 wt% (001) oriented sheet-like SrTiO3 formwork material, and having the shape of (001) oriented sheet-like SrTiO3. The preparation process comprises charging Pb(Mg1 / 3Nb2 / 3)O3-xPbTiO3 powder into the mixed solvent of anhydrous alcohol and methyl ethyl ketone, charging dispersing agent simultaneously, mixing and ball milling, then charging SrTiO3 formwork material, charging binding agent and plasticizing agent simultaneously, mixing and ball milling again, de-soaking the obtained slurry and doctor-blade casting, drying, laminating and press forming, subjecting the samples to isostatic cool pressing and plastic-discharging at elevated temperature, immersing in polyvinyl alcohol aqueous solution and pressurizing again, thermally pressing and sintering at the presence of argon atmosphere, and sintering in the atmosphere of air atmosphere, The prepared textured piezo-electric ceramics has higher degree of orientation and higher piezoelectric constant.

Description

technical field [0001] The invention relates to a textured piezoelectric ceramic and a preparation method thereof, in particular to a sheet-like SrTiO with (001) orientation 3 Preparation of Pb(Mg 1 / 3 Nb 2 / 3 )O 3 -PbTiO 3 Base textured piezoelectric ceramics. Background technique [0002] Pb(Mg 1 / 3 Nb 2 / 3 )O 3 (PMN)-based ceramics are typical relaxor ferroelectric materials, when the introduction of (PbTiO 3 )PT constitutes a PMN-PT binary system, which can significantly increase its Curie temperature, and is widely used in micro-displacement devices, brakes, smart materials and devices, etc. When the PT content is 30-35mol%, there is a quasi-isomorphic phase boundary (MPB) in the system, and the materials near the phase boundary have good dielectric and piezoelectric properties. Although PMN-PT single crystal has good performance, its development is limited in terms of large size, doping modification and price due to the difficulty of single crystal growth technolo...

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Problems solved by technology

Although PMN-PT single crystal has good performance, its development is limited in terms of large size, doping modification and price due to the difficulty of single crystal growth technology; while the traditional PMN-PT polycrystalline ceramics has a simple synthesis process, However, due to the random arrangement of grains in polycrystalline ceramics, the anisotropy of the grains tends to be averaged on the whole, and the performance cancels out and is far from the standard of single crystals.

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