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A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect and its preparation method

A technology of ceramic material and electric card effect, applied in the field of inorganic functional materials, can solve problems such as application limitations, and achieve the effect of large pyroelectric response, expansion of electric card temperature variation range, and large pyroelectric response

Active Publication Date: 2019-01-29
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In bulk electrical card materials, Pb(Mn 1 / 3 Nb 1 / 3 )O 3 -PbTiO 3 (PMN-PT) has been studied the most, it has a relatively wide diffuse ferroelectric phase transition, and can produce a relatively large electric card effect in a relatively large temperature range (80 ~ 160 ° C) [Appl.Phys.Lett .,2011,98(24):242902], but the Curie temperature of PMN-PT is much higher than room temperature, and its application near room temperature is limited to some extent. Therefore, it is urgent to find a large electric card in a wide temperature range near room temperature. effect of new materials
However, no one has attempted to convert Ca 2+ Ions are introduced into the PST system to obtain enhanced pyroelectric performance; meanwhile, there are currently no studies on the electrocardiographic effect of PST and PCST systems

Method used

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  • A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect and its preparation method
  • A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect and its preparation method
  • A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect is composed of:

[0055] Pb 0.3 Ca 0.05 Sr 0.65 TiO 3

[0056] (1) Calculate the composition Pb in the raw material according to the above chemical formula 3 o 4 , CaCO 3 , SrCO 3 and TiO 2 The mass is prepared according to the composition ratio, mixed by wet ball milling, and mixed for 24 hours according to the mass ratio of raw materials: ball: water = 1:1.7:1.2, so that the components are mixed evenly. After drying, pass through a 30-mesh sieve, briquette in an air atmosphere, raise the temperature to 900°C at a rate of 2°C / min, and keep the temperature for 2 hours for synthesis.

[0057] (2) smash the ceramic block obtained in step (1), pass through a 40-mesh sieve, and then finely grind for 48 hours by wet ball milling, dry the finely ground ceramic powder, and then add 8wt.% of the powder weight PVA binder, granulated, aged for 24...

Embodiment 2

[0069] A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect is composed of:

[0070] Pb 0.3 Ca 0.15 Sr 0.55 TiO 3

[0071] The preparation method of Example 1 was repeated according to the above formula, except that the temperature was raised to 1260° C. for sintering at a rate of 2° C. / min during the sintering process.

[0072] Carry out room temperature XRD test to the ceramic sample of present embodiment, the result sees Figure 10 , which is a standard ternary solid solution of perovskite structure without other impurity phases.

[0073] Dielectric thermograms and off-field pyroelectric coefficients were measured for the ceramic samples of this example, and the results are shown in Fig. 4(a) and Fig. 4(b). According to its dielectric spectrum, the Curie temperature of the sample is 5°C, which is close to room temperature. By component preference, under an electric field of 200V / mm, Pb 0.3 Ca...

Embodiment 3

[0076] A new type of ceramic material with both field-enhanced pyroelectric performance and wide temperature zone electric card effect is composed of:

[0077] Pb 0.325 Ca 0.15 Sr 0.525 TiO 3

[0078] The preparation method of Example 1 was repeated according to the above formula, except that the temperature was raised to 1300° C. at a rate of 2° C. / min during the sintering process.

[0079] Carry out room temperature XRD test to the ceramic sample of present embodiment, the result sees Figure 10 , which is a standard ternary solid solution of perovskite structure without other impurity phases.

[0080] Dielectric thermograms and off-field pyroelectric coefficients were measured for the ceramic samples of this example, and the results are shown in Fig. 7(a) and Fig. 7(b). From Figure 7(a) and Figure 7(b), it can be seen that the Curie temperature of the sample is 21°C, and the pyroelectric coefficient of the sample is 72×10 under a bias electric field of 200V / mm. -8 C / ...

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Abstract

The invention relates to a novel ceramic material having electric-field enhancement pyroelectric property and wide temperature range electrocaloric effect and a preparation method thereof. The general formula of the ceramic material is PbxCaySr (1-x-y)TiO3, wherein 0.30< / =x< / =0.35, and 0<y< / =0.20. The ceramic material can obtain high electric-field enhancement pyroelectric response and high electrocaloric temperature variation at around room temperature. Meanwhile, due to dielectric dispersion of the material, electrocaloric temperature variation can be kept at a high level within a wide temperature range.

Description

technical field [0001] The invention belongs to the field of inorganic functional materials, and in particular relates to a field-enhanced pyroelectric and electric card ceramic material with a Curie temperature near room temperature and a preparation method thereof. Background technique [0002] The pyroelectric effect refers to the phenomenon that polarized materials generate surface polarized charges in a specific direction of the crystal due to changes in the polarization intensity after the temperature changes. Macroscopically, a voltage or current appears at both ends of the material when the temperature changes. The electric card effect is the reverse effect of the pyroelectric effect, also known as the reverse pyroelectric effect, that is, the adiabatic temperature change or isothermal entropy change caused by the change of the polarization state in the polar material due to the change of the external electric field . Since both the pyroelectric effect and the elect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/472C04B35/622
CPCC04B35/472C04B35/622C04B2235/3208C04B2235/3213C04B2235/768C04B2235/9607
Inventor 王根水韩刘洋郭少波董显林
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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