A layered perovskite nanosheet, its preparation method, layered perovskite ceramic material with preferred orientation and its preparation method

A technology of perovskite-type and ceramic materials is applied to layered perovskite-type ceramic materials and their preparation, and its preparation, in the field of layered perovskite-type nanosheets, can solve problems such as complex preparation process and achieve improved orientation. degree of effect

Active Publication Date: 2017-05-31
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation process is complicated, and the reaction template needs to be prepared in advance before preparing the preferred orientation ceramic material.

Method used

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  • A layered perovskite nanosheet, its preparation method, layered perovskite ceramic material with preferred orientation and its preparation method
  • A layered perovskite nanosheet, its preparation method, layered perovskite ceramic material with preferred orientation and its preparation method
  • A layered perovskite nanosheet, its preparation method, layered perovskite ceramic material with preferred orientation and its preparation method

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preparation example Construction

[0040] The invention provides a method for preparing layered perovskite nanosheets, comprising the following steps:

[0041] a), titanium source, bismuth source, iron source, calcium source and cobalt source are dissolved in a solvent to obtain a mixed solution;

[0042] b), the mixed solution is mixed with lye to obtain a suspoemulsion;

[0043] c), the suspoemulsion is crystallized to obtain a general formula of Bi 7-x Ca x Fe 3-y co y Ti 3 o 21 layered perovskite nanosheets;

[0044] Wherein, 0

[0045] In the preparation method of layered perovskite nanosheets provided by the present invention, firstly, titanium source, bismuth source, iron source, calcium source and cobalt source are dissolved in a solvent. In an embodiment provided by the present invention, the titanium source is tetrabutyl titanate; the bismuth source is one of bismuth nitrate, bismuth chloride, hydrates of bismuth nitrate and hydrates of bismuth chloride or multiple; the iron sourc...

Embodiment 1

[0079] Weigh 1.503g tetrabutyl titanate, 4.927g bismuth nitrate pentahydrate, 0.035g calcium nitrate tetrahydrate, 1.189g ferric nitrate nonahydrate, and 0.428g cobalt nitrate hexahydrate, dissolve in 10mL of nitric acid with a concentration of 4M, and stir magnetically to form Homogenous mixed solution of metal ions. The metal ion mixed solution was added dropwise at a rate of 0.005 mL / s into 60 mL of 2M sodium hydroxide solution to form a uniform suspension. The suspension was transferred to a polytetrafluoroethylene liner with a volume of 100 mL, and then sealed in a stainless steel reaction kettle. Place it at 200°C for 48 hours, cool down to room temperature naturally, and then go through centrifugation, washing, and drying in sequence to obtain the general formula Bi 6.9 Ca 0.1 Fe 2 CoTi 3 o 21 nanosheet powder.

[0080] Take 0.35g of the above-mentioned powder, press it under an axial pressure of 10Mpa for 60s, and press it into a biscuit disc with a diameter of 1...

Embodiment 2

[0087] Weigh 1.390g tetrabutyl titanate, 4.556g bismuth nitrate pentahydrate, 0.032g calcium nitrate tetrahydrate, 1.237g ferric nitrate nonahydrate, and 0.297g cobalt nitrate hexahydrate, dissolve in 10mL of nitric acid with a concentration of 4M, and stir magnetically to form Homogenous mixed solution of metal ions. The metal ion mixed solution was added dropwise at a rate of 0.01 mL / s into 60 mL of 2M sodium hydroxide solution to form a uniform suspension. The suspension was transferred to a polytetrafluoroethylene liner with a volume of 100 mL, and then sealed in a stainless steel reaction kettle. Place it at 200°C for 48 hours, cool down to room temperature naturally, and then go through centrifugation, washing, and drying in sequence to obtain the general formula Bi 6.9 Ca 0.1 Fe 2.25 co 0.75 Ti 3 o 21 nanosheet powder.

[0088] Take 0.35g of the above-mentioned powder, press it under an axial pressure of 10Mpa for 120s, and press it into a biscuit disc with a dia...

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Abstract

The invention belongs to the field of inorganic materials, and particularly relates to a layered perovskite nanosheet, a preparation method thereof, a preferred orientation type layered perovskite ceramic material and a preparation method of the layered perovskite ceramic material. Ca and Co are doped in a layered perovskite nanosheet preparation process, so that the ratio of the length to the thickness of the prepared nanosheet is increased, ordered arrangement of the nanosheets in a pressing forming process is facilitated by means of the increased ratio, accordingly, the degree of orientation of the finally prepared layered perovskite ceramic material is increased, and the finally prepared layered perovskite ceramic material has preferred orientation. The preparation method of the preferred orientation type layered perovskite ceramic material is simple to operate, and the prepared preferred orientation type layered perovskite ceramic material has high degree of orientation and has magnetic anisotropy.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a layered perovskite nanosheet, a preparation method thereof, a layered perovskite ceramic material with preferred orientation and a preparation method thereof. Background technique [0002] The concept of multiferroic materials was proposed by Schmid in Switzerland in 1994, which means that the same phase of materials contains two or more basic properties of iron, such as ferroelectricity, ferromagnetism and ferroelasticity. This kind of material has both spontaneous ferroelectric order and ferromagnetic order at a certain temperature. It is their simultaneous existence that causes the magnetoelectric coupling effect, makes multiferroic materials have some special physical properties, and triggers several new, Significant physical phenomena, such as: generating electrical polarization or inducing ferroelectric phase transition under the action of a magnetic field; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B18/00C04B35/26C04B35/475C04B35/622
Inventor 陆亚林傅正平李晓宁
Owner UNIV OF SCI & TECH OF CHINA
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