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Thin-film material with high electrocaloric effect and preparation method of thin-film material

A technology of thin film material and electric card effect, which is applied in the field of high electric card effect thin film material and its preparation, 0.5BCT-0.5BZT-Fe thin film material and its preparation field, can solve the problems of poor repeatability and high cost, and achieve The effect of simplifying the preparation process, easy control and reducing production cost

Active Publication Date: 2018-11-27
XIJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for precise addition or removal of metal ion (Fe3+) into certain chemical compounds that have potential applications such as catalysts used in various industries like automobile manufacturing processes. By doing this it provides an efficient way to make these types of molecules without requiring expensive equipment.

Problems solved by technology

Technological Problem: Current technical solutions involve traditional techniques like liquid crystal electrode refrigrosion type memory (RAM), but they suffer drawbacks due to their own limitations. These include requiring long periods of energy input during manufacturing processes, difficulty achieving stable results over a wider temperature range, limited applicational areas, poor reproduction rates, and difficult fabricating them within compact sizes. Additionally, there exist issues associated with conventional iron salt glasses containing lithium ion conductors, where impurities added cause instabilities when changing between stoichiometric and tetravaleratrylic acid metaphosphoric acid/ferrite interphase boundaries.

Method used

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  • Thin-film material with high electrocaloric effect and preparation method of thin-film material
  • Thin-film material with high electrocaloric effect and preparation method of thin-film material
  • Thin-film material with high electrocaloric effect and preparation method of thin-film material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The present embodiment provides a kind of sol-gel method to prepare the method for high electrical card effect 0.5BCT-0.5BZT-Fe film material, comprises the following steps:

[0042] (1) Pt / Ti / SiO 2 Immerse the / Si substrate in acetone, absolute ethanol, and deionized water respectively, then use an ultrasonic cleaner for 15-35 minutes and dry it with an infrared lamp;

[0043] (2) According to the molar ratio of metal ions Ba:Ca:Zr:Ti:Fe is 0.85:0.15:0.1-x:0.9:x, wherein the value range of x is 0.0~0.03, weigh barium acetate and calcium acetate dissolved in Add a certain amount of acetic acid, and stir at 40-70°C until all are dissolved to obtain solution A; weigh tetra-n-butyl titanate, zirconium isopropoxide and iron nitrate nonahydrate, dissolve them in ethylene glycol methyl ether, and Stir at 40-70°C until they are all dissolved, then mix the three solutions to obtain solution B, mix solution A and solution B, use ethylene glycol methyl ether as a diluent to adju...

Embodiment 2

[0050] Utilize the same preparation method of embodiment 1, prepare the 0.5BCT-0.5BZT-xFe of different Fe dosages, as Figure 4 As shown, it shows that the introduction of Fe makes the 0.5BZT-0.5BCT-xFe thin film (0.005≤x≤0.02) coexist at room temperature with three ordered structures of tetragonal phase-trigonal phase-orthorhombic phase, and makes the phase transition temperature of the system drop Near room temperature and broadened the dielectric peak, showing the characteristics of a diffuse phase transition. In a wide temperature range, polar and nonpolar regions coexist, and at a lower electric field, a field-induced phase transition can occur, thereby enhancing the electrocardiographic effect. For electric card materials, the improvement of the electric card effect and the reduction of the phase transition temperature to about room temperature are the needs of practical applications.

Embodiment 3

[0052] This example demonstrates the ferroelectric properties of the 0.5BCT-0.5BZT-xFe thin film material. Such as Figure 5 As shown, the 0.5BZT-0.5BCT-xFe films all exhibit good hysteresis loops. The film has the best ferroelectric properties when x=0.01, P max =25μC / cm 2 , P r =14μC / cm 2 ,E c =170kV / cm, it has a large polarization value at a lower electric field, and a large polarization value is a prerequisite for an improved electric card effect.

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Abstract

The invention discloses a thin-film material with a high electrocaloric effect and a preparation method of the thin-film material. The thin-film material is 0.5 (Ba0.7Ca0.3)TiO3-0.5Ba(Ti0.8Zr0.2)O3-xFe, x is 0.0-0.03. The preparation method comprises the following steps: dissolving barium acetate and calcium acetate in acetic acid, separately dissolving tetra-n-butyl titanate, zirconium isopropoxide and iron nitrate nonahydrate in ethylene glycol monomethyl ether, then mixing and diluting an obtained solution, and cooling the solution to a room temperature to obtain sol; and preparing a thin film by using a spin-coating method, repeating a coating and pretreatment process for multiple times, carrying out annealing treatment on a substrate on which the thin film grows, and cooling to the room temperature to obtain a target thin film. The preparation method of the thin film is mild in preparation environment, low in cost, high in reliability and simple in process; and by the method, thethin-film material with the high electrocaloric effect is expected to be obtained.

Description

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Claims

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Application Information

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Owner XIJING UNIV
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