Method for improving the electrocaloric effect of barium titanate-based ferroelectric perovskite electrocaloric materials
By introducing multiple elements into a barium titanate matrix for co-doping, a barium titanate-based ferroelectric perovskite electrocaloric material with high electrocaloric performance was prepared. This solved the problem of insufficient electrocaloric strength of inorganic ferroelectric materials under high electric fields, achieved a high electrocaloric effect over a wide temperature range, and improved the performance of refrigeration equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- SHANGHAI JIAOTONG UNIV
- Filing Date
- 2024-11-28
- Publication Date
- 2026-05-12
AI Technical Summary
Existing inorganic ferroelectric materials cannot achieve ultra-high electrocaloric strength under high electric fields, and it is difficult to balance large electrocaloric effect and wide operating temperature range.
By introducing elements such as zirconium, hafnium, tin, strontium, and calcium into a barium titanate matrix for multi-element co-doping, and then synthesizing and sintering the material using a solid-state method at high temperature, a barium titanate-based ferroelectric perovskite electrocaloric material with high electrocaloric performance was prepared.
It significantly improves the electrocaloric strength and temperature stability, broadens the working temperature range of the material, enabling it to have a large electrocaloric effect in the near-room temperature range, simplifies the design of electrocaloric refrigeration equipment, and improves the refrigeration capacity.
Smart Images
Figure CN119430913B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a technology in the field of all-solid-state refrigeration materials, specifically a method for improving the electrocaloric effect of barium titanate-based ferroelectric perovskite electrocaloric materials. Background Technology
[0002] The electrocaloric effect is an important development direction for the development of new refrigeration equipment, and doping is an effective means to improve the performance of electrocaloric materials. However, existing doping techniques, due to their small doping amounts or limited doping types, do not significantly alter the overall material structure. The electrocaloric effect is essentially the thermal effect resulting from the transition between order and disorder in the polarized structure under the influence of an electric field. Therefore, this multi-element co-doping method can significantly improve the electrocaloric effect. Summary of the Invention
[0003] This invention addresses the shortcomings of existing inorganic ferroelectric materials, which cannot achieve ultra-high electrocaloric strength under high electric fields, and the difficulty in balancing large electrocaloric effects and wide operating temperature ranges in existing inorganic electrocaloric materials. It proposes a method to improve the electrocaloric effect of ferroelectric perovskite materials. Using barium titanate ceramic as a matrix, precursors of zirconium, hafnium, tin, strontium, and calcium are introduced during solid-state synthesis. Multi-element doping is simultaneously applied to the A and B sites to replace BaTiO3 material. The resulting product is obtained by high-temperature sintering after blending. This method features simple preparation conditions, mature technology, low cost, and high reliability. Under electric field induction, it generates a large entropy change and electrocaloric effect.
[0004] This invention is achieved through the following technical solution:
[0005] This invention relates to a method for improving the electrocaloric effect of barium titanate-based ferroelectric perovskite electrocaloric materials. The method involves weighing Ba, Sr, Ca, Hf, Sn, Zr, and Ti sources, mixing them uniformly according to stoichiometric ratios, and then pre-sintering to obtain (Ba... x Sr y Ca z A 1-x-y-z (Hf) a Sn b Zr c Ti d B 1-a-b-c-d O3 powder is finely ground, mixed with a binder, granulated, and then shaped, aged, and descaled to obtain a ceramic green body. Finally, it is sintered to obtain a barium titanate-based ferroelectric perovskite electric material with high electric calorific value, wherein: 0.6≤x<1, 0<y≤0.4, 0<z≤0.4, 0<a≤0.3, 0<b≤0.3, 0<c≤0.3, 0.7≤d<1.
[0006] The stoichiometric ratio mentioned above refers to the percentage of each element (Ba). x Sr y Caz A 1-x-y-z (Hf) a Sn b Zr c Ti d B 1-a-b-c-d The chemical composition ratio of O3 materials.
[0007] The Ba source, Sr source, Ca source, Hf source, Sn source, Zr source, and Ti source are oxides containing the element or salts and hydroxides that can decompose into the desired oxide at high temperatures, such as BaO, SrO, CaO, or Ba(OH)2, Sr(OH)2, Ca(OH)2, etc.; preferably BaCO3, SrCO3, CaCO3, HfO2, SnO2, ZrO2, and TiO2.
[0008] The aforementioned pre-sintering refers to: in an oxygen, air, or nitrogen atmosphere, at a temperature of 2–5°C for [time missing] minutes. -1 The heating rate is increased to 1100-1400℃, and the temperature is maintained for 1-6 hours, preferably 2-4 hours, followed by furnace cooling.
[0009] The binder is polyvinyl alcohol, polyethylene glycol, polystyrene, methylcellulose or a combination thereof, and its amount is 5 to 10 wt% of the ceramic powder.
[0010] The aging process refers to aging at room temperature for 22 to 48 hours, preferably 22 to 26 hours.
[0011] The aforementioned plastic removal refers to: in an oxygen or air atmosphere, at a temperature not exceeding 2°C for [time period missing]. -1 The heating rate is increased to 600-800℃, and the temperature is held for 1-3 hours. The preferred temperature for discharging the plastic is 650-750℃.
[0012] The sintering mentioned refers to the process of sintering at 2-5°C in an oxygen, air, or nitrogen atmosphere. -1 The heating rate is increased to 1300-1500℃, preferably 1300-1400℃, and held for 1-6 hours. After sintering, the furnace is cooled to room temperature.
[0013] This invention relates to the barium titanate-based ferroelectric perovskite electrocaloric material prepared by the above method, specifically (Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.025 Sn 0.025 Zr 0.025 Ti 0.925 O3、(Ba 0.8 Sr 0.2 (Hf) 0.02 Sn 0.02 Zr0.02 Ti 0.94 O3、
[0014] (Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.03 Sn 0.03 Zr 0.03 Ti 0.91 )O3 or (Ba 0.905 Sr 0.09 Ca 0.005 (Hf) 0.0307 Sn 0.0307 Zr 0.0307 Ti 0.9079 )O3.
[0015] This invention relates to an application of the above-mentioned barium titanate-based ferroelectric perovskite electrocardiogram material, which is used to prepare the electrode layer of a solid-state refrigeration element.
[0016] The application is specifically as follows: magnetron sputtering gold is performed on the surface of barium titanate-based ferroelectric perovskite electrocard material, and a gold electrode layer is obtained by depositing it in a vacuum at a current of 0.2 to 0.3 nA for 30 to 180 s.
[0017] Technical effect
[0018] This invention refines the ferroelectric domains in inorganic ferroelectric ceramics, increasing the substrate entropy that can induce the electrocaloric effect and optimizing the electrocaloric strength. Compared with existing technologies, this invention significantly improves the electrocaloric strength while refining the ferroelectric domains in inorganic ferroelectric ceramics, significantly increasing the domain wall density, improving the polarization freedom of the material, increasing the substrate entropy that can induce the electrocaloric effect, and optimizing the electrocaloric strength, especially under high electric fields. The temperature stability of the electrocaloric effect is improved. Multi-element co-doping ensures the simultaneous existence of various electric dipole moments dispersed in the material, which widens the operating temperature range of this material, enabling it to exhibit a large electrocaloric effect over a relatively wide temperature range near room temperature. Using the electrocaloric refrigeration material of this invention simplifies the design of electrocaloric refrigeration equipment and improves the cooling capacity of electrocaloric refrigerators. Attached Figure Description
[0019] Figure 1 This is a scanning electron microscope image of the high-electricity ceramic sheet from Example 1.
[0020] Figure 2 This is a schematic diagram of the dielectric temperature spectrum of the high electrocaloric performance ceramic material in Example 1;
[0021] Figure 3 This is a schematic diagram of the hysteresis loop of the high-electric-calorie-performance ceramic material in Example 1;
[0022] Figure 4The temperature change curve of the electrocaloric effect of the high electrocaloric performance ceramic material in Example 1 is shown as a function of temperature.
[0023] Figure 5 This is a schematic diagram of the temperature change curves of the electrocaloric effect of the high electrocaloric performance ceramic materials in Examples 1-4 as a function of electric field strength. Detailed Implementation
[0024] Example 1
[0025] Ferroelectric ceramic materials (Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.025 Sn 0.025 Zr 0.025 Ti 0.925 Preparation of O3:
[0026] 1) Using BaCO3, SrCO3, CaCO3, HfO2, SnO2, ZrO2, and TiO2 as raw materials, the mixture was prepared according to the stoichiometric ratio shown in the chemical formulas. Wet ball milling was used, with a mass ratio of raw materials:milling ball:ethanol = 1:(2~10):(0.7~1.2), and the mixture was mixed for 16 hours. Zirconia balls were selected as the milling balls. After drying, the mixture was pressed into blocks to obtain mixed powder blocks, and then milled at 2℃ for 1 minute in air atmosphere. -1 The temperature was increased to 1200℃ for pre-sintering, held at that temperature for 3 hours, and then cooled in the furnace. The resulting material was then pulverized and passed through a 40-mesh sieve to obtain (Ba). 0.8 Sr 0.199 Ca 0.001 (Hf) 0.025 Sn 0.025 Zr 0.025 Ti 0.925 O3 powder; then a second ball milling is performed using a stirred ball milling method to make the particle size smaller. The stirred ball milling is carried out according to the mass ratio of raw material: ball milling mill: ethanol = 1:10:2. After ball milling for 3 hours, the powder is dried and sieved.
[0027] 2) Take the (Ba) obtained in step 1) 0.8 Sr 0.199 Ca 0.001 (Hf) 0.025 Sn 0.025 Zr 0.025 Ti 0.925O3 powder was finely ground for 3 hours using a ball milling method, with a mass ratio of raw material: ball mill: ethanol = 1:(2~10):(0.7~1.2). After drying and sieving, 9wt% polyvinyl alcohol (PVA) binder was added and granulated. Subsequently, it was pressed into shape, aged for 24 hours, and then ground again in a mortar and passed through a 40-mesh sieve. The resulting powder was pressed into round discs with a diameter of 12.7 mm and a thickness of 2 mm. Then, it was heated to 700℃ in an air atmosphere and exfoliated for 2 hours to obtain ceramic blanks.
[0028] 3) Place the ceramic blank into an alumina crucible, cover it with calcined powder of the same composition, cover the crucible, and incubate in air at 2°C for 1 minute. -1 The heating rate was increased to 1380℃, held for 2 hours, and then cooled with the furnace to obtain a barium titanate-based ferroelectric ceramic material with high electrocaloric performance.
[0029] This embodiment further utilizes the above-mentioned barium titanate-based ferroelectric ceramic material. The sintered ceramic material sample from step 3 is ground into a ceramic sheet with a thickness of 0.15 mm. After ultrasonic cleaning and drying, the upper and lower surfaces are magnetron sputtered with gold. The gold electrode layer is obtained by depositing the gold electrode layer in a vacuum for 90 seconds with a current of 0.25 nA.
[0030] Electrocaloric effect thermal flux and cold heat flow tests were performed on ceramic components to obtain the following results: Figure 2 The dielectric temperature spectrum of the ferroelectric ceramic in this embodiment is shown. The figure shows that this material has a high dielectric constant at room temperature and multiple dielectric peaks near room temperature, indicating its potential for electro-induced phase transition.
[0031] like Figure 3 The diagram shown is a schematic of the hysteresis loop of the ferroelectric ceramic element prepared in this embodiment at room temperature.
[0032] like Figure 4 The figure shows the electrocaloric effect temperature curves of the ferroelectric ceramic material prepared in this embodiment under different temperatures and electric field strengths. As can be seen from the figure, this ceramic material has a wide operating temperature range.
[0033] like Figure 5 The figure shows the electrocaloric temperature change of the ceramic element prepared in this embodiment as a function of electric field strength, and a comparison with other embodiments (i.e., designs with different compositions). It can be seen from the figure that the multi-element coexisting ceramic material designed by this method has high electrocaloric effect strength.
[0034] Example 2
[0035] Ferroelectric ceramic materials (Ba 0.8 Sr 0.2 (Hf) 0.02 Sn 0.02 Zr 0.02 Ti0.94 Preparation of O3:
[0036] 1) Using BaCO3, SrCO3, HfO2, SnO2, ZrO2, and TiO2 as raw materials, the mixture was prepared according to the stoichiometric ratios shown in the chemical formulas. Wet ball milling was used, with a mass ratio of raw materials:milling ball:ethanol = 1:(2-10):(0.7-1.2), and the mixture was mixed for 16 hours. Zirconia balls were selected as the milling balls. After drying, the mixture was pressed into blocks to obtain mixed powder blocks, and then milled at 2℃ for 1 minute in air. -1 The temperature was increased to 1200℃ for pre-sintering, held at that temperature for 3 hours, and then cooled in the furnace. The resulting material was then pulverized and passed through a 40-mesh sieve to obtain (Ba). 0.8 Sr 0.2 (Hf) 0.02 Sn 0.02 Zr 0.02 Ti 0.94 O3 powder; then a second ball milling is performed using a stirred ball milling method to make the particle size smaller. The stirred ball milling is carried out according to the mass ratio of raw material: ball milling mill: ethanol = 1:10:2. After ball milling for 3 hours, the powder is dried and sieved.
[0037] 2) Take the (Ba) obtained in step 1) 0.8 Sr 0.2 (Hf) 0.02 Sn 0.02 Zr 0.02 Ti 0.94 O3 powder was finely ground for 3 hours using a ball milling method, with a mass ratio of raw material: ball mill: ethanol = 1:(2~10):(0.7~1.2). After drying and sieving, 9wt% polyvinyl alcohol (PVA) binder was added and granulated. Subsequently, it was pressed into shape, aged for 24 hours, and then ground again in a mortar and passed through a 40-mesh sieve. The resulting powder was pressed into round discs with a diameter of 12.7 mm and a thickness of 2 mm. Then, it was heated to 700℃ in an air atmosphere and exfoliated for 2 hours to obtain ceramic blanks.
[0038] 3) Place the ceramic blank into an alumina crucible, cover it with calcined powder of the same composition, cover the crucible, and incubate in air at 2°C for 1 minute. -1 The heating rate was increased to 1380℃, held for 2 hours, and then cooled with the furnace to obtain a barium titanate-based ferroelectric ceramic material with high electrocaloric performance.
[0039] This embodiment further utilizes the above-mentioned barium titanate-based ferroelectric ceramic material. The sintered ceramic material sample from step 3 is ground into a ceramic sheet with a thickness of 0.15 mm. After ultrasonic cleaning and drying, the upper and lower surfaces are magnetron sputtered with gold. The gold electrode layer is obtained by depositing the gold electrode layer in a vacuum for 90 seconds with a current of 0.25 nA.
[0040] The test results of the temperature change due to the electrocardiographic effect in this embodiment, and the comparison with the results of other embodiments, can be seen in... Figure 5 .
[0041] Example 3
[0042] Ferroelectric ceramic materials (Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.03 Sn 0.03 Zr 0.03 Ti 0.91 Preparation of O3:
[0043] 1) Using BaCO3, SrCO3, CaCO3, HfO2, SnO2, ZrO2, and TiO2 as raw materials, the mixture was prepared according to the stoichiometric ratio shown in the chemical formulas. Wet ball milling was used, with a mass ratio of raw materials:milling ball:ethanol = 1:(2~10):(0.7~1.2), and the mixture was mixed for 16 hours. Zirconia balls were selected as the milling balls. After drying, the mixture was pressed into blocks to obtain mixed powder blocks, and then milled at 2℃ for 1 minute in air atmosphere. -1 The temperature was increased to 1200℃ for pre-sintering, held at that temperature for 3 hours, and then cooled in the furnace. The resulting material was then pulverized and passed through a 40-mesh sieve to obtain (Ba). 0.8 Sr 0.199 Ca 0.001 (Hf) 0.03 Sn 0.03 Zr 0.03 Ti 0.91 O3 powder; then a second ball milling is performed using a stirred ball milling method to make the particle size smaller. The stirred ball milling is carried out according to the mass ratio of raw material: ball milling mill: ethanol = 1:10:2. After ball milling for 3 hours, the powder is dried and sieved.
[0044] 2) Take the (Ba) obtained in step 1) 0.8 Sr 0.199 Ca 0.001 (Hf) 0.03 Sn 0.03 Zr 0.03 Ti 0.91 O3 powder was finely ground for 3 hours using a ball milling method, with a mass ratio of raw material: ball mill: ethanol = 1:(2~10):(0.7~1.2). After drying and sieving, 9wt% polyvinyl alcohol (PVA) binder was added and granulated. Subsequently, it was pressed into shape, aged for 24 hours, and then ground again in a mortar and passed through a 40-mesh sieve. The resulting powder was pressed into round discs with a diameter of 12.7 mm and a thickness of 2 mm. Then, it was heated to 700℃ in an air atmosphere and exfoliated for 2 hours to obtain ceramic blanks.
[0045] 3) Place the ceramic blank into an alumina crucible, cover it with calcined powder of the same composition, cover the crucible, and incubate in air at 2°C for 1 minute. -1 The heating rate was increased to 1380℃, held for 2 hours, and then cooled with the furnace to obtain a barium titanate-based ferroelectric ceramic material with high electrocaloric performance.
[0046] This embodiment further utilizes the above-mentioned barium titanate-based ferroelectric ceramic material. The sintered ceramic material sample from step 3 is ground into a ceramic sheet with a thickness of 0.15 mm. After ultrasonic cleaning and drying, the upper and lower surfaces are magnetron sputtered with gold. The gold electrode layer is obtained by depositing the gold electrode layer in a vacuum for 90 seconds with a current of 0.25 nA.
[0047] The test results of the temperature change due to the electrocardiographic effect in this embodiment, and the comparison with the results of other embodiments, can be seen in... Figure 5 .
[0048] Example 4
[0049] Ferroelectric ceramic materials (Ba 0.905 Sr 0.09 Ca 0.005 (Hf) 0.0307 Sn 0.0307 Zr 0.0307 Ti 0.9079 Preparation of O3:
[0050] 1) Using BaCO3, SrCO3, CaCO3, HfO2, SnO2, ZrO2, and TiO2 as raw materials, the mixture was prepared according to the stoichiometric ratio shown in the chemical formulas. Wet ball milling was used, with a mass ratio of raw materials:milling ball:ethanol = 1:(2~10):(0.7~1.2), and the mixture was mixed for 16 hours. Zirconia balls were selected as the milling balls. After drying, the mixture was pressed into blocks to obtain mixed powder blocks, and then milled at 2℃ for 1 minute in air atmosphere. -1 The temperature was increased to 1200℃ for pre-sintering, held at that temperature for 3 hours, and then cooled in the furnace. The resulting material was then pulverized and passed through a 40-mesh sieve to obtain (Ba). 0.905 Sr 0.09 Ca 0.005 (Hf) 0.0307 Sn 0.0307 Zr 0.0307 Ti 0.9079 O3 powder; then a second ball milling is performed using a stirred ball milling method to make the particle size smaller. The stirred ball milling is carried out according to the mass ratio of raw material: ball milling mill: ethanol = 1:10:2. After ball milling for 3 hours, the powder is dried and sieved.
[0051] 2) Take the (Ba) obtained in step 1) 0.905 Sr 0.09 Ca 0.005 (Hf) 0.0307 Sn 0.0307 Zr0.0307 Ti 0.9079 O3 powder was finely ground for 3 hours using a ball milling method, with a mass ratio of raw material: ball mill: ethanol = 1:(2~10):(0.7~1.2). After drying and sieving, 9wt% polyvinyl alcohol (PVA) binder was added and granulated. Subsequently, it was pressed into shape, aged for 24 hours, and then ground again in a mortar and passed through a 40-mesh sieve. The resulting powder was pressed into round discs with a diameter of 12.7 mm and a thickness of 2 mm. Then, it was heated to 700℃ in an air atmosphere and exfoliated for 2 hours to obtain ceramic blanks.
[0052] 3) Place the ceramic blank into an alumina crucible, cover it with calcined powder of the same composition, cover the crucible, and incubate in air at 2°C for 1 minute. -1 The heating rate was increased to 1380℃, held for 2 hours, and then cooled with the furnace to obtain a barium titanate-based ferroelectric ceramic material with high electrocaloric performance.
[0053] This embodiment further utilizes the above-mentioned barium titanate-based ferroelectric ceramic material. The sintered ceramic material sample from step 3 is ground into a ceramic sheet with a thickness of 0.15 mm. After ultrasonic cleaning and drying, the upper and lower surfaces are magnetron sputtered with gold. The gold electrode layer is obtained by depositing the gold electrode layer in a vacuum for 90 seconds with a current of 0.25 nA.
[0054] The test results of the temperature change due to the electrocardiographic effect in this embodiment, and the comparison with the results of other embodiments, can be seen in... Figure 5 .
[0055] like Figure 5 The figure shows the electrocaloric refrigeration temperature variation of electrocaloric ceramics with different compositions. The preferred composition shown in Example 1 exhibits superior electrocaloric refrigeration performance compared to Examples 2-4. This data demonstrates the crucial role of composition in regulating the electrocaloric refrigeration performance of ferroelectric ceramic materials, and that the preferred composition can significantly improve performance.
[0056] Compared with existing ceramic composition designs, this invention employs a multi-element co-doping material structure control method, simultaneously introducing multiple elements into the material to increase the polarization entropy of the electrocaloric ceramic, thereby improving its electrocaloric refrigeration performance. The barium titanate-based lead-free ferroelectric ceramic material provided by this invention exhibits excellent electrocaloric performance and good temperature stability. The electrocaloric strength of the optimized composition is greater than 0.5 Km MV. -1 The operating temperature range is greater than 30K, and the optimal composition (x = 0.8, y = 0.199, z = 0.001, a = 0.025, b = 0.025, c = 0.025, d = 0.925) has an calorific value as high as 1 kcal / m MV. -1 The operating temperature range is greater than 60K near room temperature. At 10MV m -1 It exhibits high electrocaloric effect and excellent temperature stability below the electric field strength.
[0057] The above-described specific implementations can be partially adjusted by those skilled in the art in different ways without departing from the principles and purpose of the present invention. The scope of protection of the present invention is defined by the claims and is not limited to the above-described specific implementations. All implementation schemes within the scope of the claims are bound by the present invention.
Claims
1. A method for preparing a barium titanate-based ferroelectric perovskite electrocardiogram material, characterized in that, The barium titanate-based ferroelectric perovskite electrocardioid material is (Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.025 Sn 0.025 Zr 0.025 Ti 0.925 O3、(Ba 0.8 Sr 0.2 (Hf) 0.02 Sn 0.02 Zr 0.02 Ti 0.94 O3、(Ba 0.8 Sr 0.199 Ca 0.001 (Hf) 0.03 Sn 0.03 Zr 0.03 Ti 0.91 )O3 or (Ba 0.905 Sr 0.09 Ca 0.005 (Hf) 0.0307 Sn 0.0307 Zr 0.0307 Ti 0.9079 The preparation method of O3 refers to: weighing BaCO3, SrCO3, CaCO3, HfO2, SnO2, ZrO2 and TiO2 and mixing them evenly according to the stoichiometric ratio, and then pre-sintering to obtain powder; After fine grinding and mixing with a binder, the mixture is granulated, then shaped, aged, and descaled to obtain a ceramic green body; finally, through sintering, a barium titanate-based ferroelectric perovskite electrocaloric material with high electrocaloric performance is obtained. The aforementioned pre-sintering refers to: in an oxygen, air, or nitrogen atmosphere, at a temperature of 2–5°C for [time missing] minutes. -1 The heating rate is increased to 1100-1400℃, held for 1-6 hours, and then cooled with the furnace; The aging process refers to aging at room temperature for 22 to 48 hours. The aforementioned plastic removal refers to: in an oxygen or air atmosphere, at a temperature not exceeding 2°C for [time period missing]. -1 The heating rate is increased to 600-800℃, and the temperature is maintained for 1-3 hours; The sintering mentioned refers to the process of sintering at 2-5°C in an oxygen, air, or nitrogen atmosphere. -1 The heating rate is increased to 1300-1500℃, held for 1-6 hours, and then cooled to room temperature with the furnace after sintering.
2. The preparation method according to claim 1, characterized in that, The binder is polyvinyl alcohol, polyethylene glycol, polystyrene, methylcellulose or a combination thereof, and its amount is 5 to 10 wt% of the ceramic powder.
3. A barium titanate-based ferroelectric perovskite electrocardiogram material, characterized in that, It is prepared by the method described in claim 1 or 2.
4. An application of a barium titanate-based ferroelectric perovskite electrocardiogram material prepared according to the method of claim 1 or 2, or according to claim 3, characterized in that, Gold electrode layers were obtained by magnetron sputtering on the surface of barium titanate-based ferroelectric perovskite electrocard material, with a current of 0.2~0.3nA deposited in vacuum for 30~180s.