Ternary piezoelectric ceramic material and preparation method thereof
By preparing ternary piezoelectric ceramic materials and introducing BiScO3, Li2MO4 and lanthanide rare earth element Ln to form a solid solution, the problem of improving the performance of PZT-based piezoelectric ceramic materials was solved, achieving excellent piezoelectric performance and mechanical quality factor, suitable for high-power transmitting devices and electromechanical conversion systems.
Patent Information
- Application Number
- CN202411947799.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-26
- Publication Date
- 2026-01-30
AI Technical Summary
Existing PZT-based piezoelectric ceramic materials have shortcomings in terms of performance improvement and are unable to meet the increasingly demanding application requirements.
A method for preparing ternary piezoelectric ceramic materials with the chemical structure αPb(Mg1/3Nb2/3)O3-(1-α)Pb(ZrxTi1-x)O3-ywt.%BiScO3-zwt.%Li2MO4:Ln was adopted. By introducing BiScO3, Li2MO4 and the lanthanide rare earth element Ln, a good solid solution was formed, which improved the piezoelectric properties.
The prepared piezoelectric ceramic material has excellent piezoelectric properties, making it suitable for high-power transmitting devices and electromechanical conversion systems. It improves the mechanical quality factor and can be applied in fields such as sonar systems and ultrasonic atomization.
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Figure CN121426558A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of piezoelectric ceramic materials, in particular to a ternary piezoelectric ceramic material and a preparation method thereof. BACKGROUND
[0002] Piezoelectric ceramic is a kind of polycrystalline material with mechanical energy and electrical energy conversion, which has become one of the important information functional materials in the 21st century. Piezoelectric ceramics can be divided into two categories according to whether Pb element is contained in the system: the first category is lead-containing piezoelectric ceramic; the second category is lead-free piezoelectric ceramic. The most representative of lead-containing piezoelectric ceramic is lead zirconate titanate piezoelectric ceramic, which has a chemical formula of Pb(Zr x Ti 1-x )O3(referred to as PZT), which was discovered by American scholars in the 1950s. It is widely used in various fields of production and life due to its excellent piezoelectric, dielectric, pyroelectric and ferroelectric properties.
[0003] In recent years, PZT-based piezoelectric ceramics have always dominated the market due to their excellent electrical properties. With the continuous popularization of piezoelectric ceramics, the requirements for material performance are also increasing, which requires us to further improve and upgrade PZT-based piezoelectric ceramics. SUMMARY
[0004] The present application aims at the above technical problems and provides a ternary piezoelectric ceramic material and a preparation method thereof.
[0005] The technical scheme adopted is as follows:
[0006] A ternary piezoelectric ceramic material has a chemical structure general formula as shown below:
[0007] αPb(Mg 1 / 3 Nb 2 / 3 )O3-(1-α)Pb(Zr x Ti 1-x )O3-ywt.%BiScO3-zwt.%Li2MO4:Ln
[0008] Wherein, Ln is a lanthanide rare earth element, and M is Mo or W;
[0009] 0.3≤x≤0.6;
[0010] 0<α≤0.3;
[0011] 0.5≤y≤5, 1≤z≤3.
[0012] Further, Ln is any one of La, Gd, Nd and Eu.
[0013] Further, 0.35≤x≤0.55.
[0014] Furthermore, x = 0.5.
[0015] Furthermore, 0.15 ≤ α ≤ 0.25.
[0016] Furthermore, α = 0.2.
[0017] Furthermore, 3.5≤y≤4.5, 1.5≤z≤2.5.
[0018] Furthermore, y = 4, z = 2.5.
[0019] This invention provides a method for preparing ternary piezoelectric ceramic materials:
[0020] Pb3O4, MgO, Nb2O5, ZrO2 and TiO2 were ball-milled, dried and then pre-calcined in a muffle furnace at 850°C for 2 hours to obtain pre-calcined powder.
[0021] Ln2O3 and Li2CO3 were dissolved in an appropriate amount of nitric acid to obtain a mixed solution. Ammonium molybdate was dissolved in an appropriate amount of deionized water to obtain an ammonium molybdate solution. The mixed solution was slowly added dropwise to the ammonium molybdate solution with stirring. Then, the pH of the reaction solution was adjusted to 7-8 with ammonia water. Stirring was continued, and after standing and aging, the solution was filtered. The resulting precipitate was dried and then sintered in a muffle furnace at 800℃ for 2 hours to obtain Li2MO4:Ln.
[0022] Pre-calcined powder, BiScO3, Li2MO4:Ln are mixed, ball-milled, and dried to obtain a mixed powder. The mixed powder is granulated, sieved, and pressed into a green body. The green body is heated to remove the binder and then sintered.
[0023] Furthermore, the sintering temperature is 1000-1100℃, and the sintering time is 1-5h.
[0024] The beneficial effects of this invention are:
[0025] This invention provides a ternary piezoelectric ceramic material, Pb(Mg) 1 / 3 Nb 2 / 3 BiScO3, as a lead-based relaxor ferroelectric material, can form an infinite solid solution with PZT ceramics, thus yielding PMN-PZT type piezoelectric ceramic materials with excellent piezoelectric properties. BiScO3 has an ABO3-type perovskite crystal structure, which can form a good solid solution with PMN-PZT type piezoelectric ceramic materials. Furthermore, the Bi ions it contains... 3+ ,Sc 3+The modification of PMN-PZT type piezoelectric ceramic materials has a good effect, which can effectively improve the piezoelectric properties of the materials. The introduction of Li2MO4 as a transition liquid phase in ceramic sintering can significantly reduce the sintering temperature and can be miscible with the perovskite lattice, thus playing a role in doping modification to improve piezoelectric properties. The introduction of lanthanide rare earth element Ln can further improve piezoelectric properties. This may be because lanthanide rare earth element doping can inhibit abnormal growth of ceramic grains and refine the grains, or it may be because rare earth ions with larger ionic radii replace Li. + This leads to lattice distortion, which helps reduce Li + The volatilization of the flux helps to fully utilize its role as a flux and also contributes to the improvement of piezoelectric properties. After testing, the piezoelectric ceramic prepared by this invention has good piezoelectric properties and a high mechanical quality factor. It can be used as a functional material for high-power transmitting type, high-power piezoelectric generator, piezoelectric transformer, etc., and is widely used in electromechanical conversion systems such as sonar systems, ultrasonic atomization, and ultrasonic vibration. Attached Figure Description
[0026] Figure 1 The image shows the SEM morphology of the piezoelectric ceramic material prepared in Example 1. Detailed Implementation
[0027] Unless otherwise specified in the examples, the conditions were performed under standard conditions or as recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products. Techniques not mentioned in this invention refer to existing technologies. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.
[0028] Example 1:
[0029] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0030] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4:Eu
[0031] The preparation method of the above ternary piezoelectric ceramic materials:
[0032] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0033] Dissolve 0.07 mol Eu₂O₃ and 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid to obtain a mixed solution. Add 0.1 mol (NH₄)₆Mo₇O₃... 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4:Eu.
[0034] Pre-calcined powder, BiScO3, and Li2MoO4:Eu were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body under 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1000°C at a rate of 5°C / min for 2 hours to sinter.
[0035] Example 2:
[0036] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0037] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4:Gd
[0038] The preparation method of the above ternary piezoelectric ceramic materials:
[0039] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0040] A mixed solution was obtained by dissolving 0.07 mol Gd₂O₃ and 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid. 0.1 mol (NH₄)₆Mo₇O₃ was then added. 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4:Gd.
[0041] Pre-calcined powder, BiScO3, and Li2MoO4:Gd were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body under 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1000°C at a rate of 5°C / min for 2 hours to sinter.
[0042] Example 3:
[0043] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0044] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4:Nd
[0045] The preparation method of the above ternary piezoelectric ceramic materials:
[0046] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0047] A mixed solution was obtained by dissolving 0.07 mol Nd₂O₃ and 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid. 0.1 mol (NH₄)₆Mo₇O₃ was then added. 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain an ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4:Nd.
[0048] Pre-calcined powder, BiScO3, and Li2MoO4:Nd were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body under 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1000°C at a rate of 5°C / min for 2 hours to sinter.
[0049] Example 4:
[0050] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0051] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4:Eu
[0052] The preparation method of the above ternary piezoelectric ceramic materials:
[0053] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0054] Dissolve 0.07 mol Eu₂O₃ and 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid to obtain a mixed solution. Add 0.1 mol (NH₄)₆Mo₇O₃... 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4:Eu.
[0055] Pre-calcined powder, BiScO3, and Li2MoO4:Eu were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body under 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1050°C at a rate of 5°C / min for 2 hours to sinter.
[0056] Example 5:
[0057] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0058] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4:Eu
[0059] The preparation method of the above ternary piezoelectric ceramic materials:
[0060] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0061] Dissolve 0.07 mol Eu₂O₃ and 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid to obtain a mixed solution. Add 0.1 mol (NH₄)₆Mo₇O₃... 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4:Eu.
[0062] Pre-calcined powder, BiScO3, and Li2MoO4:Eu were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with a 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body at 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1100°C at a rate of 5°C / min for 2 hours to sinter.
[0063] Comparative Example 1:
[0064] It is basically the same as Example 1, except that BiScO3 is not added.
[0065] Comparative Example 2:
[0066] It is basically the same as Example 1, except that Li2MoO4:Eu is not added.
[0067] Comparative Example 3:
[0068] The example is basically the same as in Example 1, except that Li2MoO4 is used instead of Li2MoO4:Eu.
[0069] The preparation method of the above ternary piezoelectric ceramic materials:
[0070] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0071] Dissolve 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid to obtain a mixed solution, and then dissolve 0.1 mol (NH₄)₆Mo₇O₃ in the nitric acid solution. 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4.
[0072] Pre-calcined powder, BiScO3, and Li2MoO4 were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with a 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body at 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1000°C at a rate of 5°C / min for 2 hours to sinter.
[0073] Comparative Example 4:
[0074] It is basically the same as Example 1, except that the same amount of Eu2O3 is added separately;
[0075] A ternary piezoelectric ceramic material has the following general chemical structural formula:
[0076] 0.2Pb(Mg 1 / 3 Nb 2 / 3 O3-0.8Pb(Zr) 0.5 Ti 0.5 )O3-4wt.%BiScO3-2.5wt.%Li2MoO4-Eu2O3
[0077] The preparation method of the above ternary piezoelectric ceramic materials:
[0078] Pb3O4, MgO, Nb2O5, ZrO2, and TiO2 were poured into a ball mill jar for ball milling and mixing. The ball mill was a planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. After drying the mixture obtained by ball milling, it was pre-calcined in a muffle furnace at 850℃ for 2 hours to obtain pre-calcined powder.
[0079] Dissolve 0.7 mol Li₂CO₃ in an appropriate amount of nitric acid to obtain a mixed solution, and then dissolve 0.1 mol (NH₄)₆Mo₇O₃ in the nitric acid solution. 24 • Dissolve 4H2O in an appropriate amount of deionized water to obtain ammonium molybdate solution. Add the mixed solution slowly dropwise to the ammonium molybdate solution while stirring. Then adjust the pH of the reaction solution to 7-8 with ammonia water. Continue stirring for about 30 minutes. After standing and aging for 24 hours, filter. After drying the precipitate, sinter it in a muffle furnace at 800℃ for 2 hours to obtain Li2MoO4.
[0080] Pre-calcined powder, BiScO3, Li2MoO4, and Eu2O3 were poured into a ball mill jar for ball milling and mixing. The ball mill was a micro planetary ball mill, the ball mill jar was made of nylon, the grinding balls were zirconia balls, the grinding media was anhydrous ethanol, the ball milling speed was 300 r / min, and the ball milling was carried out by alternating forward and reverse operation with an interval of 1 hour, for a total ball milling time of 10 hours. The mixture obtained from ball milling was dried to obtain a mixed powder. The mixed powder was mixed with a 5 wt.% polyvinyl alcohol solution, granulated, and passed through an 80-mesh sieve. Then, it was pressed into a green body under 200 MPa. The green body was heated to 700°C at a rate of 1°C / min, held at this temperature for 2 hours to remove the binder, and then heated to 1000°C at a rate of 5°C / min for 2 hours to sinter.
[0081] Performance testing:
[0082] The surfaces of the piezoelectric ceramic materials prepared in Examples 1-5 and Comparative Examples 1-4 were polished and coated with silver paste on both sides. They were kept at 750°C for 10 min and then polarized in silicone oil at 120°C with a DC voltage of 4 kV / mm for 20 min. After being placed for 24 h, they were used as samples to test their electrical properties.
[0083] The room temperature piezoelectric constant of the sample was measured using a ZJ-3AN quasi-static piezoelectric constant tester.
[0084] The electromechanical coupling coefficient kp, mechanical quality factor Qm, and dielectric loss tanδ (25℃, 1V, 1kHz) of the sample were measured and analyzed using a precision impedance analyzer (Agilent HP4294A).
[0085] The test results are shown in Table 1 below:
[0086] Table 1:
[0087]
[0088] As can be seen from the comparison of Examples 1-3 in Table 1 above, the piezoelectric ceramics prepared by the present invention have good piezoelectric properties;
[0089] A comparison of Example 1 with Examples 4 and 5 shows that a sintering temperature above 1000℃ will cause a decrease in piezoelectric properties.
[0090] The comparison between Example 1 and Comparative Example 1 shows that BiScO3 plays a positive role in improving the piezoelectric properties of piezoelectric ceramics.
[0091] The comparison between Example 1 and Comparative Example 2 shows that the addition of Li2MoO4:Eu component plays a positive role in improving the piezoelectric properties of piezoelectric ceramics.
[0092] A comparison between Example 1 and Comparative Example 3 shows that the introduction of Gd, Nd, and Eu all play a positive role in improving the piezoelectric properties of piezoelectric ceramics.
[0093] A comparison between Example 1 and Comparative Example 4 shows that the introduction of Li2MoO4:Eu improves piezoelectric performance better than Li2MoO4+Eu2O3.
[0094] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A ternary piezoelectric ceramic material, characterized by, The chemical structure general formula is as follows: aPb(Mg 1 / 3 Nb 2 / 3 )O3-(1-a)Pb(Zr x Ti 1-x )O3-ywt. % BiScO3-zwt. % Li2MO4: Ln Wherein, Ln is lanthanide rare earth element, M is Mo or W; 0.3≤x≤0.6； 0＜α≤0.3； 0.5≤y≤5, 1≤z≤3.
2. The ternary piezoelectric ceramic material according to claim 1, wherein, Ln is any one of La, Gd, Nd, Eu.
3. The ternary piezoelectric ceramic material according to claim 1, wherein 0.35≤x≤0.55。 4. The ternary piezoelectric ceramic material according to claim 1, wherein, x＝0.5。 5. The ternary piezoelectric ceramic material according to claim 1, wherein, 0.15≤α≤0.25。 6. The ternary piezoelectric ceramic material according to claim 1, wherein α＝0.2。 7. The ternary piezoelectric ceramic material according to claim 1, wherein 3.5≤y≤4.5, 1.5≤z≤2.
5.
8. The ternary piezoelectric ceramic material according to claim 1, wherein, y=4, z=2.
5.
9. A method of producing a ternary piezoelectric ceramic material as claimed in any one of claims 1 to 8, characterized by, Pb(Mg 1 / 3 Nb 2 / 3 )O3, Pb(Zr x Ti 1-x )O3, BiScO3, Li2MO4:Ln are mixed by ball milling, dried to obtain mixed powder, granulated, sieved, pressed into a green body, and sintered after the green body is heated and degreased.
10. The method of producing a ternary piezoelectric ceramic material according to Claim 9, wherein The sintering temperature is 1000-1100℃, and the sintering time is 1-5h.