A room temperature paraelectric-ferroelectric tunable ceramic material and its preparation method
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A ceramic material and paraelectric technology, applied in the field of room temperature paraelectric-ferroelectric tunable ceramic materials and their preparation, can solve the problems of quantum fluctuation effect hindering the formation of ferroelectric order, and achieve the effect of simple preparation process
Active Publication Date: 2021-12-10
HARBIN UNIV OF SCI & TECH
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[0003] The invention aims to solve the technical problem that the quantum fluctuation effect of the existing strontium titanate material hinders the o
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specific Embodiment approach 1
[0033] Specific Embodiment 1: In this embodiment, a room temperature paraelectric-ferroelectric adjustable ceramic material is strontium titanate ceramic material with a chemical formula of (1-x)SrTiO 3 -xLiAlSiO 4 , where 0﹤x≤0.15.
specific Embodiment approach 2
[0034] Specific embodiment two: In this embodiment, a method for preparing a room temperature paraelectric-ferroelectric adjustable ceramic material is carried out in the following steps:
[0035] One, according to the molar ratio of strontium titanate and eucryptite powder is (1-x): x, wherein 0﹤x≤0.15, weigh strontium titanate powder and eucryptite powder;
[0036] 2. Put the strontium titanate and eucryptite powder weighed in step 1 into a ball mill for mixing to obtain a slurry;
[0037] 3. Dry the slurry obtained in step 2 to obtain a mixed powder;
[0038] 4. Sieve the mixed powder obtained in step 3 to obtain a prefabricated powder;
[0039] 5. Add polyvinyl alcohol to the prefabricated powder prepared in step 4 to granulate to obtain mixed granules;
[0040] 6. Control the pressure of the mixture particles obtained in step 5 to 8-15 MPa, and press to obtain discs;
[0041] 7. Put the wafer obtained in step 6 into the sintering furnace, raise the temperature to 500-600...
specific Embodiment approach 3
[0043] Specific embodiment three: the difference between this embodiment and specific embodiment two is: when mixing materials in step two, use absolute ethanol and zirconia grinding balls as the ball milling medium, control the mass ratio of the ball to material to be 5: 1, and the rotating speed is 300r / min, ball milling time is 8~12h. Others are the same as in the second embodiment.
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Abstract
A room temperature paraelectric-ferroelectric adjustable ceramic material and a preparation method thereof. The present invention relates to the field of electronic functional ceramic materials, in particular to a room temperature paraelectric-ferroelectric adjustable ceramic material and a preparation method thereof. The invention aims to solve the technical problem that the quantum fluctuation effect of the existing strontium titanate material hinders the orderly formation of ferroelectricity. The chemical formula of the ceramic material is (1‑x)SrTiO 3 ‑xLiAlSiO 4 , the present invention uses solid-phase synthesis method by doping LiAlSiO 4 Transform strontium titanate from a normal paraelectric phase material to a weak ferroelectric material at room temperature, and by gradually increasing LiAlSiO 4 Doping content to obtain strontium titanate ceramic materials with increasing ferroelectricity. The invention has simple process and low cost, and can obtain room temperature paraelectric-ferroelectric adjustable ceramic material without special process treatment. The ceramic material prepared by the invention is used in piezoelectric motors, actuators, sensors, drivers and transducers.
Description
technical field [0001] The invention relates to the field of electronic functional ceramic materials, in particular to a room temperature paraelectric-ferroelectric adjustable ceramic material and a preparation method thereof. Background technique [0002] Strontium titanate (SrTiO 3 ) has a typical ABO 3 The perovskite structure is a functional ceramic material with a wide range of uses. It has the advantages of high dielectric constant, low dielectric loss, and good thermal stability. In most cases, it is mainly used in capacitors, filters, and microelectronic devices. middle. When the temperature is around 105K, SrTiO 3 will undergo a structural phase transition from cubic phase C to tetragonal phase T (C-T phase transition), that is, at room temperature SrTiO 3 It is C phase or called paraelectric phase, and it will have obvious ferroelectricity only when the temperature is higher than 105K and transforms into T phase. with ABO 3 Materials of structure, such as SrT...
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