Microwave-energy storage integrated dielectric ceramic material with multiphase structure as well as preparation method and application of microwave-energy storage integrated dielectric ceramic material

Abstract

The invention discloses a microwave-energy storage integrated dielectric ceramic material with a multiphase structure as well as a preparation method and application thereof, and the method comprises the following steps: 1, weighing Ca2CO3, MgO and TiO2, mixing, and sequentially carrying out ball milling, drying and calcining to obtain Ca0. 8Mg0. 2TiO3 powder; 2, weighing Sm2O3 and Al2O3, mixing the Sm2O3 and the Al2O3, and sequentially carrying out ball milling, drying and calcining on the Sm2O3 and the Al2O3 to obtain SmAlO3 powder; 3, weighing Ca0. 8Mg0. 2TiO3 powder and SmAlO3 powder according to a stoichiometric formula (1-x) Ca0. 8Mg0. 2TiO3-xSmAlO3, x is greater than or equal to 0.28 and less than or equal to 0.40, mixing the Ca0. 8Mg0. 2TiO3 powder and the SmAlO3 powder, and sequentially carrying out ball milling, drying, grinding and sieving to obtain a sieved material; 4, the sieved material is subjected to compression molding and calcination, the microwave-energy storage integrated dielectric ceramic material with the multiphase structure is obtained, the dielectric constant epsilon r of the microwave-energy storage integrated dielectric ceramic material is 35-85, the breakdown electric field intensity Eb is 300-700 kV / cm, the energy storage density U is 1.5-3.5 J / cm < 3 >, the Qf is 23000-34000 GHz, in the temperature range of-150-350 DEG C, the variation delta epsilon r of the dielectric constant is smaller than or equal to + / -5%, the loss tangent tan delta is smaller than or equal to 5 * 10 <-3 >, and the microwave-energy storage integrated dielectric ceramic material with the multiphase structure is obtained. The microwave dielectric property and the energy storage property are excellent.

Description

Technical Field

[0001] The present invention belongs to the technical field of electronic ceramics, and in particular relates to a microwave-energy storage integrated dielectric ceramic material with a complex phase structure, a preparation method and an application thereof. Background Art

[0002] The implementation of the "dual carbon" strategy and the evolution of 6G communication technology have brought unprecedented challenges and opportunities to modern electronic information technology. Among them, the rapid development of wireless communications, new energy vehicles, pulse power systems and portable electronic devices, coupled with the urgent need for low-carbon transformation of energy systems, exponential growth in information transmission rates and highly integrated equipment, are jointly driving electronic components towards higher performance, lower energy consumption and smaller size. This requires core basic materials, especially functional ceramic materials, to have multifunctional integration and excellent comprehensive performance.

[0003] The design of traditional functional materials mostly follows the paradigm of "single performance optimization", focusing on individual energy storage density or microwave dielectric properties. In actual application scenarios, it is often difficult to simultaneously meet the above-mentioned complex and interrelated performance requirements such as high energy efficiency, high frequency, high stability and miniaturization. Therefore, based on the core common characteristics of dielectric ceramic materials, the simultaneous optimization of energy storage and microwave dielectric performance is crucial for the application of future multifunctional integrated devices. Summary of the Invention

[0004] The purpose of the present invention is to provide a microwave-energy storage integrated dielectric ceramic material with a complex phase structure, a preparation method and an application thereof. Not only is the preparation process simple and environmentally friendly, but the prepared dielectric ceramic material also has excellent microwave dielectric properties and energy storage properties.

[0005] The present invention is achieved through the following technical solutions:

[0006] A microwave-energy storage integrated dielectric ceramic material with a multiphase structure, the stoichiometric formula is (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3, where x is the mole fraction, 0.28≤x≤0.40, its dielectric constant ε r The breakdown electric field strength is 35~85, b The voltage range is 300-700 kV / cm, and the energy storage density U is 1.5-3.5 J / cm 3 , Qf is 23000~34000GHz, in the temperature range of -150~350℃, the change of dielectric constant Δε r ≤±5%, loss tangent tanδ≤5×10 -3 .

[0007] Furthermore, the chemical formula is 0.64Ca0.8 Mg 0.2 TiO3-0.36SmAlO3, its dielectric constant ε r The breakdown electric field strength is 40~70, b The energy storage density is 680kV / cm and the energy storage density U is 3.5J / cm 3 , Qf is 32000GHz, in the temperature range of -150 ~ 350 ℃, the change in dielectric constant Δε r ≤±5%, loss tangent tanδ≤5×10 -3 .

[0008] A method for preparing a microwave-energy storage integrated dielectric ceramic material with a complex phase structure comprises the following steps:

[0009] Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2 TiO3, weigh Ca2CO3, MgO and TiO2 and mix them, then carry out wet ball milling and drying in sequence, and then calcine at 1050-1200℃ for 2-3h to obtain Ca 0.8 Mg 0.2 TiO3 powder;

[0010] Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 are weighed and mixed, and then wet ball milled and dried in sequence, and then calcined at 1100-1300°C for 2-3 hours to obtain SmAlO3 powder;

[0011] Step 3: According to the stoichiometric formula (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3, 0.28≤x≤0.40, weigh Ca 0.8 Mg 0.2 TiO3 powder and SmAlO3 powder were mixed and then wet ball milled, dried, ground and sieved to obtain (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3 sieved material;

[0012] Step 4: (1-x)Ca 0.8 Mg 0.2 The sieved TiO3-xSmAlO3 material is placed in a mold and pressed into shape to form a ceramic green body, which is then subjected to cold isostatic pressing and then transferred to a muffle furnace. The temperature is raised from room temperature to 1100-1400°C at a rate of 3-5°C / min, kept warm for 120-240 minutes, and then cooled to 500°C at a rate of 5°C / min. The material is then cooled to room temperature with the furnace to obtain a microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

[0013] Furthermore, the wet ball milling in step 1 and step 2 is performed by mixing the material, the balls and the liquid in a mass ratio of 1: (3-6): (0.8-2.5), and ball milling for 8-16 hours at a rotation speed of 300-500 r / min, wherein: the liquid is deionized water or anhydrous ethanol; the balls are zirconium balls of three different diameters, large, medium and small, mixed in a mass ratio of 1:3:1.

[0014] Furthermore, the wet ball milling in step 3 is performed by mixing the material, the balls and the liquid in a mass ratio of 1: (4.5-5.5): (0.8-1.6), and ball milling for 12-24 hours at a speed of 300-500 r / min, wherein: the liquid is deionized water or anhydrous ethanol; the balls are zirconium balls of three different diameters, large, medium and small, mixed in a mass ratio of 1:3:1.

[0015] Furthermore, the screening in step 3 is performed through a sieve with a mesh size of 120 to 300.

[0016] Furthermore, the cold isostatic pressing process in step 4 is as follows: first pressurizing to 180-220 MPa at a rate of 20-40 MPa / min, maintaining the pressure for 3-5 minutes, and then releasing the pressure at a rate of 20-40 MPa / min.

[0017] Furthermore, the drying in steps 1 to 3 is carried out in an oven at 80 to 100° C. for 8 to 15 hours.

[0018] A microwave-energy storage integrated dielectric ceramic material with a complex phase structure is used as a microwave dielectric ceramic and a linear energy storage ceramic in multifunctional integrated devices.

[0019] The present invention has the following beneficial technical effects:

[0020] First, the ceramic material (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3, dielectric constant 35~85, breakdown electric field strength E b The voltage range is 300-700 kV / cm, and the energy storage density U is 1.5-3.5 J / cm 3 , Qf is 23000-34000GHz, and has excellent microwave dielectric properties and energy storage performance; secondly, the ceramic material (1-x)Ca 0.8 Mg 0.2 The change in dielectric constant Δε of TiO3-xSmAlO3 in the ultra-wide temperature range of -150~350℃ r ≤±5%, loss tangent tanδ≤5×10 -3, showing excellent dielectric stability; thirdly, the ceramic material (1-x)Ca 0.8 Mg 0.2 The resonant frequency temperature coefficient of TiO3-xSmAlO3 can be adjusted to close to 0, so that when it is used as a microwave dielectric ceramic, it can better adapt to environmental changes and will not cause signal distortion or communication link failure due to external factors; Fourthly, the ceramic material (1-x)Ca 0.8 Mg 0.2 The pulse discharge time of TiO3-xSmAlO3 is close to 0, which can release the stored energy faster, which is conducive to obtaining a faster response speed and is suitable for devices that require extremely fast response.

[0021] The microwave-energy storage integrated dielectric ceramic material 0.64Ca 0.8 Mg 0.2 TiO3-0.36SmAlO3, dielectric constant ε at low frequency r The dielectric constant at microwave frequency is 40, and the energy storage density U is 3.5 J / cm 3 , Qf is 32000GHz, in the temperature range of -150 ~ 350 ℃, the change in dielectric constant Δε r ≤±5%, loss tangent tanδ≤5×10 -3 , with both excellent microwave dielectric properties and energy storage properties.

[0022] The present invention adds SmAlO3 to Ca 0.8 Mg 0.2 TiO3 is doped with A / B-site donors and acceptors to prepare a microwave-energy storage integrated dielectric ceramic material with a complex phase structure. The raw materials do not contain Pb, S, Cd and other components that are harmful to human health and pollute the environment. It is not only environmentally friendly, with a simple preparation process and low preparation cost, but also the synthesized microwave-energy storage integrated dielectric ceramic material has good dielectric stability and excellent energy storage performance and microwave dielectric properties. It is suitable for both high-power pulse systems and new communication devices. As an important candidate for high-performance lead-free multifunctional integrated materials, it is of great significance to promote the development of multifunctional integrated devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is an SEM scanning image of the microwave-energy storage integrated dielectric ceramic material prepared in Example 1 of the present invention;

[0024] Figure 2 This is a graph showing the change in dielectric constant of the microwave-energy storage integrated dielectric ceramic material prepared in Example 1 of the present invention with temperature;

[0025] Figure 3This is a PE hysteresis loop diagram of the microwave-energy storage integrated dielectric ceramic material prepared in Example 1 of the present invention;

[0026] Figure 4 It is Qf of the microwave-energy storage integrated dielectric ceramic material prepared in Examples 1 to 4 of the present invention. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below with reference to specific embodiments, which are intended to explain the present invention rather than to limit it.

[0028] Example 1

[0029] Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2 TiO3, Ca2CO3, MgO and TiO2 were weighed and mixed to obtain mixture A, and zirconium balls of three different diameters, large, medium and small, were first mixed in a mass ratio of 1:3:1, and then the mixture A, zirconium balls and anhydrous ethanol were mixed in a mass ratio of 1:6:1, and ball milled at a speed of 390r / min for 10h, then transferred to an oven, dried at 80℃ for 10h, and then calcined at 1100℃ for 2.5h to obtain Ca 0.8 Mg 0.2 TiO3 powder;

[0030] Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 were weighed and mixed to obtain a mixture B. First, zirconium balls of three different diameters, large, medium, and small, were mixed in a mass ratio of 1:3:1. Then, the mixture B, zirconium balls, and anhydrous ethanol were mixed in a mass ratio of 1:4:1. The mixture was ball-milled at a speed of 390 r / min for 10 hours, and then transferred to an oven and dried at 80°C for 10 hours. Then, the mixture was calcined at 1250°C for 2.5 hours to obtain SmAlO3 powder.

[0031] Step 3: According to the stoichiometric formula 0.64Ca 0.8 Mg 0.2 TiO3-0.36SmAlO3, weigh Ca 0.8 Mg 0.2 TiO3 powder and SmAlO3 powder were mixed to obtain mixture C. First, zirconium balls of three different diameters, large, medium and small, were mixed in a mass ratio of 1:3:1. Then, mixture C, zirconium balls and anhydrous ethanol were mixed in a mass ratio of 1:5:1. The mixture was ball-milled at a speed of 300 r / min for 18 h, and then transferred to an oven and dried at 80 ° C for 15 h. After grinding, it was passed through a 200 mesh sieve to obtain 0.64Ca 0.8 Mg 0.2 TiO3-0.36SmAlO3 sieved material;

[0032] Step 4: 0.64Ca 0.8 Mg 0.2 The sieved TiO3-0.36SmAlO3 material was placed into a mold and pressed into shape to form a ceramic green body. The ceramic green body was then cold isostatically pressed. The specific process was as follows: first, pressurizing at a rate of 40 MPa / min to 200 MPa, holding the pressure for 3 minutes, and then releasing the pressure at a rate of 40 MPa / min to cold isostatically press the ceramic green body to obtain a ceramic disc.

[0033] Step 5: Place the ceramic disc into an alumina sagger with sieved material as a pad, then place the alumina sagger into a muffle furnace, heat from room temperature to 1350°C at a rate of 3°C / min, keep warm for 120 minutes, then cool to 500°C at a rate of 5°C / min, and cool to room temperature with the furnace to obtain a dense microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

[0034] Example 2

[0035] Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2 TiO3, Ca2CO3, MgO and TiO2 were weighed and mixed to obtain mixture A, firstly zirconium balls of three different diameters, large, medium and small, were mixed in a mass ratio of 1:3:1, then the mixture A, zirconium balls and anhydrous ethanol were mixed in a mass ratio of 1:3:0.8, and ball milled at a speed of 300r / min for 16h, then transferred to an oven, dried at 90℃ for 15h, and then calcined at 1050℃ for 3h to obtain Ca 0.8 Mg 0.2 TiO3 powder;

[0036] Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 were weighed and mixed to obtain a mixture B. First, zirconium balls of three different diameters, large, medium, and small, were mixed in a mass ratio of 1:3:1. Then, the mixture B, zirconium balls, and anhydrous ethanol were mixed in a mass ratio of 1:3:0.8. The mixture was ball-milled at a speed of 300 r / min for 16 hours, and then transferred to an oven and dried at 90°C for 15 hours. Then, the mixture was calcined at 1100°C for 3 hours to obtain SmAlO3 powder.

[0037] Step 3: According to the stoichiometric formula 0.72Ca 0.8 Mg 0.2 TiO3-0.28SmAlO3, weigh Ca 0.8 Mg 0.2TiO3 powder and SmAlO3 powder were mixed to obtain mixture C. First, zirconium balls of three different diameters, large, medium and small, were mixed in a mass ratio of 1:3:1. Then, mixture C, zirconium balls and anhydrous ethanol were mixed in a mass ratio of 1:4.5:0.8. The mixture was ball-milled at a speed of 400 r / min for 16 h, and then transferred to an oven and dried at 90 ° C for 10 h. After grinding, it was passed through a 120-mesh sieve to obtain 0.72Ca 0.8 Mg 0.2 TiO3-0.28SmAlO3 sieved material;

[0038] Step 4: 0.72Ca 0.8 Mg 0.2 The sieved TiO3-0.28SmAlO3 material was placed into a mold and pressed into shape to form a ceramic green body. The ceramic green body was then cold isostatically pressed. The specific process was as follows: first, pressurizing at a rate of 20 MPa / min to 220 MPa, holding the pressure for 5 minutes, and then releasing the pressure at a rate of 20 MPa / min to cold isostatically press the ceramic green body to obtain a ceramic disc.

[0039] Step 5: Place the ceramic disc into an alumina sagger with sieved material as a pad, then place the alumina sagger into a muffle furnace, heat from room temperature to 1200°C at a rate of 5°C / min, keep warm for 150 minutes, then cool to 500°C at a rate of 5°C / min, and cool to room temperature with the furnace to obtain a dense microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

[0040] Example 3

[0041] Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2 TiO3, Ca2CO3, MgO and TiO2 were weighed and mixed to obtain mixture A, and zirconium balls of three different diameters, large, medium and small, were first mixed in a mass ratio of 1:3:1, and then the mixture A, zirconium balls and deionized water were mixed in a mass ratio of 1:4:1.7, and ball milled at a speed of 450r / min for 12h, then transferred to an oven, dried at 100℃ for 8h, and then calcined at 1150℃ for 2.5h to obtain Ca 0.8 Mg 0.2 TiO3 powder;

[0042] Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 were weighed and mixed to obtain a mixture B. First, zirconium balls of three different diameters, large, medium, and small, were mixed in a mass ratio of 1:3:1. Then, the mixture B, zirconium balls, and deionized water were mixed in a mass ratio of 1:4:1. The mixture was ball-milled at a speed of 450 r / min for 12 hours, and then transferred to an oven and dried at 100°C for 8 hours. Then, the mixture was calcined at 1200°C for 2.5 hours to obtain SmAlO3 powder.

[0043] Step 3: According to the stoichiometric formula 0.68Ca 0.8 Mg 0.2 TiO3-0.32SmAlO3, weigh Ca 0.8 Mg 0.2 TiO3 powder and SmAlO3 powder were mixed to obtain mixture C. First, zirconium balls of three different diameters, large, medium and small, were mixed in a mass ratio of 1:3:1. Then, mixture C, zirconium balls and deionized water were mixed in a mass ratio of 1:5:1.2. The mixture was ball-milled at a speed of 500 r / min for 12 h, and then transferred to an oven and dried at 100 ° C for 8 h. After grinding, it was passed through a 250 mesh sieve to obtain 0.68Ca 0.8 Mg 0.2 TiO3-0.32SmAlO3 sieved material;

[0044] Step 4: 0.68Ca 0.8 Mg 0.2 The sieved TiO3-0.32SmAlO3 material was placed into a mold and pressed into shape to form a ceramic green body, which was then cold isostatically pressed. The specific process was as follows: first, pressurizing at a rate of 30 MPa / min to 180 MPa, holding the pressure for 5 minutes, and then releasing the pressure at a rate of 30 MPa / min to cold isostatically press the ceramic green body to obtain a ceramic disc;

[0045] Step 5: Place the ceramic disc into an alumina sagger with sieved material as a pad, then place the alumina sagger into a muffle furnace, heat from room temperature to 1100°C at a rate of 4°C / min, keep warm for 240 minutes, then cool to 500°C at a rate of 5°C / min, and cool to room temperature with the furnace to obtain a dense microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

[0046] Example 4

[0047] Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2TiO3, Ca2CO3, MgO and TiO2 were weighed and mixed to obtain mixture A, and zirconium balls of three different diameters, large, medium and small, were first mixed in a mass ratio of 1:3:1, and then the mixture A, zirconium balls and deionized water were mixed in a mass ratio of 1:5:2.5, and ball milled at a speed of 500r / min for 8h, then transferred to an oven, dried at 80℃ for 13h, and then calcined at 1200℃ for 2h to obtain Ca 0.8 Mg 0.2 TiO3 powder;

[0048] Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 were weighed and mixed to obtain a mixture B. First, zirconium balls of three different diameters, large, medium, and small, were mixed in a mass ratio of 1:3:1. Then, the mixture B, zirconium balls, and deionized water were mixed in a mass ratio of 1:5:2.5. The mixture was ball-milled at a speed of 500 r / min for 8 hours, and then transferred to an oven and dried at 80°C for 13 hours. Then, the mixture was calcined at 1300°C for 2 hours to obtain SmAlO3 powder.

[0049] Step 3: According to the stoichiometric formula 0.6Ca 0.8 Mg 0.2 TiO3-0.4SmAlO3, weigh Ca 0.8 Mg 0.2 TiO3 powder and SmAlO3 powder were mixed to obtain mixture C. First, zirconium balls of three different diameters, large, medium and small, were mixed in a mass ratio of 1:3:1. Then, mixture C, zirconium balls and deionized water were mixed in a mass ratio of 1:5.5:1.6. The mixture was ball-milled at a speed of 550 r / min for 24 h, and then transferred to an oven and dried at 80 ° C for 13 h. After grinding, it was passed through a 300 mesh sieve to obtain 0.6Ca 0.8 Mg 0.2 TiO3-0.4SmAlO3 sieved material;

[0050] Step 4: 0.6Ca 0.8 Mg 0.2 The sieved TiO3-0.4SmAlO3 material was placed into a mold and pressed into shape to form a ceramic green body. The ceramic green body was then cold isostatically pressed. The specific process was as follows: first, pressurizing at a rate of 40 MPa / min to 200 MPa, holding the pressure for 4 minutes, and then releasing the pressure at a rate of 40 MPa / min to cold isostatically press the ceramic green body to obtain a ceramic disc.

[0051] Step 5: Place the ceramic disc into an alumina sagger with sieved material as a pad, then place the alumina sagger into a muffle furnace, heat it from room temperature to 1400°C at a rate of 5°C / min, keep it warm for 200 minutes, then cool it to 500°C at a rate of 5°C / min, and cool it to room temperature with the furnace to obtain a dense microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

[0052] like Figure 1 As shown, it can be seen that the microwave-energy storage integrated dielectric ceramic material with a complex phase structure prepared in Example 1 has different grain patterns, indicating that it is a complex phase structure.

[0053] The microwave-energy storage integrated dielectric ceramic material with a complex phase structure prepared in Example 1 was cleaned, and then Ag electrodes were coated on both sides of the sample. The silver was calcined at 650°C for 25 minutes to obtain a test ceramic wafer. The dielectric and ferroelectric properties were tested. The results are as follows:

[0054] like Figure 2 As shown, it can be seen that the microwave-energy storage integrated dielectric ceramic material with a complex phase structure prepared in Example 1 has a very small fluctuation in the dielectric constant within an ultra-wide temperature range and is always maintained at around 70, indicating that it has good dielectric stability, which is conducive to simultaneously obtaining excellent energy storage performance and microwave dielectric properties;

[0055] like Figure 3 As shown in the figure, it can be seen that the hysteresis loop of the microwave-energy storage integrated dielectric ceramic material with a complex phase structure prepared in Example 1 is linear, and the breakdown electric field intensity E b It is 680kV / cm, indicating that it has good energy storage performance.

[0056] The microwave-energy storage integrated dielectric ceramic materials with a complex phase structure prepared in Examples 1 to 4 were processed into thin slices with a thickness of 5 mm, and microwave dielectric properties were tested. The results are as follows:

[0057] like Figure 4 As shown, it can be seen that the Qf of the microwave-energy storage integrated dielectric ceramic material with a complex phase structure prepared in Examples 1 to 4 is 23000 to 34000 GHz, and Qf increases with the increase of SmAlO3, indicating that the introduction of SmAlO3 gives the ceramic material good microwave dielectric properties.

Claims

1. A microwave-energy storage integrated dielectric ceramic material with a complex phase structure, characterized in that: The stoichiometric formula is (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3, where x is the mole fraction, 0.28≤x≤0.40, its dielectric constant ε r The breakdown electric field strength is 35~85, b The voltage range is 300-700 kV / cm, and the energy storage density U is 1.5-3.5 J / cm 3 , Qf is 23000~34000GHz, in the temperature range of -150~350℃, the change of dielectric constant Δε r ≤±5%, loss tangent tanδ≤5×10 -3 .

2. The microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 1, characterized in that: The chemical formula is 0.64Ca 0.8 Mg 0.2 TiO3-0.36SmAlO3, its dielectric constant ε r The breakdown electric field strength is 40~70, b The energy storage density is 680kV / cm and the energy storage density U is 3.5J / cm 3 , Qf is 32000GHz, in the temperature range of -150 ~ 350 ℃, the change in dielectric constant Δε r ≤±5%, loss tangent tanδ≤5×10 -3 .

3. A method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 1 or 2, characterized in that: The steps include: Step 1: According to the stoichiometric formula Ca 0.8 Mg 0.2 TiO3, weigh Ca2CO3, MgO and TiO2 and mix them, then carry out wet ball milling and drying in sequence, and then calcine at 1050-1200℃ for 2-3h to obtain Ca 0.8 Mg 0.2 TiO3 powder; Step 2: According to the stoichiometric formula of SmAlO3, Sm2O3 and Al2O3 are weighed and mixed, and then wet ball milled and dried in sequence, and then calcined at 1100-1300°C for 2-3 hours to obtain SmAlO3 powder; Step 3: According to the stoichiometric formula (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3, 0.28≤x≤0.40, weigh Ca 0.8 Mg 0.2 TiO3 powder and SmAlO3 powder were mixed and then wet ball milled, dried, ground and sieved to obtain (1-x)Ca 0.8 Mg 0.2 TiO3-xSmAlO3 sieved material; Step 4: (1-x)Ca 0.8 Mg 0.2 The sieved TiO3-xSmAlO3 material is placed in a mold and pressed into shape to form a ceramic green body, which is then subjected to cold isostatic pressing and then transferred to a muffle furnace. The temperature is raised from room temperature to 1100-1400°C at a rate of 3-5°C / min, kept warm for 120-240 minutes, and then cooled to 500°C at a rate of 5°C / min. The material is then cooled to room temperature with the furnace to obtain a microwave-energy storage integrated dielectric ceramic material with a complex phase structure.

4. The method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 3, characterized in that: The wet ball milling in step 1 and step 2 is to mix the material, the balls and the liquid in a mass ratio of 1: (3-6): (0.8-2.5), and ball mill for 8-16 hours at a rotation speed of 300-500 r / min, wherein: the liquid is deionized water or anhydrous ethanol; the balls are zirconium balls of three different diameters, large, medium and small, mixed in a mass ratio of 1:3:

1.

5. The method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 3, characterized in that: The wet ball milling in step 3 is to mix the material, balls and liquid in a mass ratio of 1: (4.5-5.5): (0.8-1.6), and ball mill for 12-24 hours at a speed of 300-500 r / min, wherein: the liquid is deionized water or anhydrous ethanol; the balls are zirconium balls of three different diameters, large, medium and small, mixed in a mass ratio of 1:3:

1.

6. The method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 3, characterized in that: The sieving in step 3 is performed through a sieve with a mesh size of 120 to 300.

7. The method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 3, characterized in that: The process of the cold isostatic pressing in step 4 is as follows: first pressurizing to 180-220 MPa at a rate of 20-40 MPa / min, maintaining the pressure for 3-5 minutes, and then releasing the pressure at a rate of 20-40 MPa / min.

8. The method for preparing the microwave-energy storage integrated dielectric ceramic material with a complex phase structure according to claim 3, characterized in that: The drying in steps 1 to 3 is carried out in an oven at 80 to 100° C. for 8 to 15 hours.

9. Use of the microwave-energy storage integrated dielectric ceramic material with a complex phase structure as claimed in claim 1 or 2 as a microwave dielectric ceramic and a linear energy storage ceramic in a multifunctional integrated device.

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