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A bismuth sodium titanate-based solid-state phase-change refrigeration material and its application

A technology of solid-state phase change and sodium bismuth titanate, which is applied in the direction of luminescent materials, heat exchange materials, sustainable manufacturing/processing, etc., can solve the problems of high driving electric field and electric breakdown of electric card effect refrigeration technology, etc. Achieve the effects of low driving electric field, environmental friendliness and high energy efficiency

Active Publication Date: 2021-08-03
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electric card effect refrigeration technology has the advantages of non-polluting working medium, high energy efficiency, low cost, small size, and easy integration, but requires a high driving electric field
[0004] Although existing literature 1: Large electrostrictive effect and high optical temperature sensing in Bi 0.5 Na 0.5 TiO 3 -BaTiO 3 -(Sr 0.7 Bi 0.18 Er 0.02 )TiO 3 luminescentferroelectrics discloses a rare earth-doped ferroelectric material, but it does not solve the electrical breakdown problem of the electric card effect refrigeration technology

Method used

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  • A bismuth sodium titanate-based solid-state phase-change refrigeration material and its application
  • A bismuth sodium titanate-based solid-state phase-change refrigeration material and its application
  • A bismuth sodium titanate-based solid-state phase-change refrigeration material and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select eigenvalues ​​y=0.06, α=0.1, β=0.18, γ=0.02 to get (0.94-x)Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -xSr 0.7 □ 0.1 Bi 0.18 Er 0.02 TiO 3 Ceramic material.

[0033] figure 1 (a)-(e) is (0.94-x)Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -xSr 0.7 □ 0.1 Bi 0.18 Er 0.02 TiO 3 The P-E, J-E, and S-E loops of ceramic materials show that the x=0 component presents a saturated P-E curve, accompanied by two domain wall switching current J(E) peaks and a butterfly-shaped S-E curve, which has typical ferroelectric characteristics. When the SBET solid solution amount reaches 0.04, the material presents a pinned P-E loop, accompanied by ±E B at two strong J(E) peaks and at ±E F There are two shoulder J(E) peaks. In addition, the material also presents a large negative strain butterfly-shaped S-E curve and the highest d 33 =175pC / N( figure 1 f), which is a typical quasi-isomorphic phase boundary ferroelectric behavior. When the SBET solid solution content is further incre...

Embodiment 2

[0035] Select eigenvalues ​​x=0.055, y=0.06, α=0.1, β=0.18, γ=0.02 to get 0.885Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -0.055Sr 0.7 □ 0.1 Bi 0.18 Er 0.02 TiO 3 Ceramic material.

[0036] figure 2 a is 0.885Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -0.055Sr 0.7 □ 0.1 Bi 0.18 Er 0.02 TiO 3 The unidirectional P-E, J-E, and S-E curves of ceramic materials, the large strain behavior of the material can be explained by the model diagram of the phase transition evolution with the electric field in the inset (a): at a low electric field 15kV / cm is applied, polar nano-regions (PNRs) in the R matrix nucleate and aggregate, resulting in a gradual increase in strain; when loaded A sufficiently high electric field E F At ≈30kV / cm, the FE phase acts as a seed core to induce the PNRs to transform into a long-range ordered FE phase, thereby generating large strains.

[0037] figure 2 b is 0.885Bi 0.5 Na 0.5 TiO 3 -0.06BaTiO 3 -0.055Sr 0.7 □ 0.1 Bi 0.18 Er 0.02 TiO 3 Dielectric th...

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Abstract

The invention discloses a bismuth sodium titanate-based solid-state phase-change refrigeration material and its application. The chemical formula of the material is (1‑x‑y) Bi 0.5 Na 0.5 TiO 3 ‑xBaTiO 3 -ySr 1‑α‑β‑γ □ α Bi β Er γ TiO 3 , where □ is Sr vacancy, 0

Description

technical field [0001] The invention relates to the technical field of inorganic non-metallic functional materials, in particular to a bismuth sodium titanate-based solid-state phase-change refrigeration material and its application. Background technique [0002] With population growth and economic development, the demand for refrigeration in various fields of human life and production such as daily clothing, food, housing, transportation and cutting-edge science and technology has risen sharply, resulting in a substantial increase in energy consumption for refrigeration. The working fluid used in traditional gas compression refrigeration technology destroys the ozone layer of the atmosphere and aggravates global warming. Therefore, it is an urgent need to find a technology to replace the traditional gas compression refrigeration. In recent years, the refrigeration technology that causes entropy changes by applying or removing specific (stress, magnetic, electric, temperatu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/462C09K5/06C09K11/78
CPCC04B35/462C04B2235/3201C04B2235/3213C04B2235/3215C04B2235/3224C04B2235/3298C09K5/066C09K11/7703Y02P20/10
Inventor 张景基邢洪杰王乐建贾轩睿王疆瑛
Owner CHINA JILIANG UNIV
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