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Narrow band gap sodium bismuth titanate-nickel barium titanate ferroelectric material, and preparation method and application thereof

A ferroelectric material, bismuth sodium titanate technology, applied in the field of ferroelectric materials, can solve the problem of not being able to use the visible and near-infrared parts of the solar spectrum, and achieve the effect of large photoresponse current

Active Publication Date: 2019-03-19
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned shortcoming of the prior art, the object of the present invention is to provide a kind of narrow bandgap sodium bismuth titanate-barium nickel titanate ferroelectric material, for solving the narrow bandgap binary ferroelectric material in the prior art can not use Problems with the visible and near-infrared portions of the solar spectrum

Method used

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  • Narrow band gap sodium bismuth titanate-nickel barium titanate ferroelectric material, and preparation method and application thereof
  • Narrow band gap sodium bismuth titanate-nickel barium titanate ferroelectric material, and preparation method and application thereof
  • Narrow band gap sodium bismuth titanate-nickel barium titanate ferroelectric material, and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0039] According to the general formula (1-x)(Na 0.5 Bi 0.5 )TiO 3 -xBa(Ti 0.5 Ni 0.5 )O 2.5 The bismuth sodium titanate-barium nickel titanate, which is a high-voltage ferroelectric material with a narrow band gap, is formulated.

[0040] When x=0.02, its formula is 0.98 (Na 0.5 Bi 0.5 )TiO 3 -0.02Ba(Ti 0.5 Ni 0.5 )O 2.5 .

[0041] The first step: using analytically pure sodium carbonate, barium carbonate, bismuth carbonate, bismuth oxide, titanium dioxide and nickel oxide as raw materials, according to the stoichiometric ratio, calculate the mass of each raw material component required and weigh it to obtain the ingredients ;

[0042] The second step: use absolute ethanol as the ball milling medium for the ingredients, and use a roller ball mill for 48 hours to dry to obtain a mixed dry powder;

[0043] The third step: pre-burn the mixed dry powder obtained in the second step at 850°C for 4 hours, add polyvinyl alcohol aqueous solution to the pre-fired powder to...

Embodiment 2

[0051] When x=0.03, its formula is 0.97 (Na 0.5 Bi 0.5 )TiO 3 -0.03Ba(Ti 0.5 Ni 0.5 )O 2.5

[0052] The preparation method in this example is the same as that in Example 1, except that the amount of barium nickel titanate powder mixed in the preparation process is different. The amount of the mixed substance in this example is 3% barium nickel titanate.

[0053] Material optical bandgap: Eg 1 =0.95eV, Eg 2 =1.42eV, Eg 3 =2.43eV;

[0054] Material electrical properties: d 33 =113 pC N -1 , P r =25.7μC cm -2 ,T d = 142.35°C.

Embodiment 3

[0056] When x=0.04, its formula is 0.96 (Na 0.5 Bi 0.5 )TiO 3 -0.04Ba(Ti 0.5 Ni 0.5 )O 2.5

[0057] The preparation method in this example is the same as that in Example 1, except that the amount of barium nickel titanate powder mixed in the preparation process is different, and the amount of the mixed substance in this example is 4% barium nickel titanate.

[0058] Material optical bandgap: Eg 1 =0.94eV, Eg 2 =1.41eV, Eg 3 =2.40eV;

[0059] Material electrical properties: d 33 =130pC N -1 , P r =29.6μC cm -2 ,T d = 120.79°C.

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Abstract

The invention provides a narrow band gap sodium bismuth titanate-nickel barium titanate ferroelectric material, and a preparation method and application thereof. The general formula of the ferroelectric material is (1-x)(Na0.5Ba0.5)TiO3-xBa(Ti0.5Ni0.5)O2.5, wherein the value range of the x is 0.01 to 0.09. According to the narrow band gap high-piezoelectric ferroelectric material provided by the invention, acquisition and response of light, heat and mechanical energy can be realized simultaneously; and the narrow band gap high-piezoelectric ferroelectric material provided by the invention canbe applied to the devices of multi-energy acquisition, multifunctional sensing and the like, has high optical response current in near-infrared light, and can be applied to the fields of infrared detectors, optical communication devices and the like.

Description

technical field [0001] The invention relates to a ferroelectric material, in particular to a narrow band gap sodium bismuth titanate-barium nickel titanate ferroelectric material. Background technique [0002] As a material with excellent ferroelectric, piezoelectric and pyroelectric properties, all-inorganic perovskite ferroelectric materials are often used in sensors, drivers, ultrasonic transducers and other devices. play a vital role in daily life. At present, more researches are mainly divided into lead (PbTiO 3 -system) and lead-free (BaTiO 3 -system, (K,Na)NbO 3 -system and (Bi,Na)TiO 3 - system, etc.) two types of ferroelectric materials. The ferroelectric and piezoelectric properties of these ferroelectric materials are greatly improved by doping, so they are widely used in sensors, energy harvesting and other fields. However, the band gaps of these ferroelectric materials are relatively large (2.8-4.0eV), and the large band gap makes ferroelectric materials o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/475C04B35/622H01L43/10
CPCC04B35/475C04B35/622C04B2235/3232C04B2235/3236C04B2235/3279C04B2235/3201C04B2235/3215C04B2235/768H10N50/85
Inventor 郭益平肖鸿源
Owner SHANGHAI JIAO TONG UNIV
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