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a raise y 2 nimno 6 Methods for the Properties of Ceramic Multiferroics

A technology of performance and ceramics, applied in the field of improving the multiferroic properties of Y2NiMnO6 ceramics, to achieve the effects of improved multiferroic properties, large polarization value and simple process

Inactive Publication Date: 2017-12-22
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although as early as 2010, Professor Sanjeev Kumar of Leiden University in the Netherlands predicted Y from the first principle 2 NiMnO 6 is a new type of multiferroic material (S.Kumar, G.Giovannetti, J.V.D.Brink, and S.Picozzi, Phys.Rev.B 82, 134429 (2010)), but the multiferroic material has not been synthesized experimentally, we The material was synthesized by trial and error, and by adjusting Y 2 NiMnO 6 The percentage of self-excessive Ni in the medium to improve its multiferroic properties

Method used

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  • a raise y <sub>2</sub> nimno <sub>6</sub> Methods for the Properties of Ceramic Multiferroics
  • a raise y <sub>2</sub> nimno <sub>6</sub> Methods for the Properties of Ceramic Multiferroics
  • a raise y <sub>2</sub> nimno <sub>6</sub> Methods for the Properties of Ceramic Multiferroics

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of powder: with analytically pure grade yttrium nitrate (Y(NO 3 ) 3 ·6H 2 O), nickel nitrate (Ni(NO 3 ) 3 ·6H 2 O) and manganese acetate (C 4 h 6 MnO 4 ·6H 2 O) etc. as the main raw material, press Y 2 NiMnO 6 (and Ni self-excess 3%) Weigh the raw materials that meet the stoichiometric ratio. Then weigh oxalic acid according to the total number of metal ions in molar ratio: oxalic acid=1:2, add appropriate amount of distilled water, heat and stir at 80°C until completely dissolved, heat and stir at 150°C to obtain black dry gel, and finally calcined at 1000°C for 15 hours to obtain Ni from excess Y 2 NiMnO 6 Powder.

[0020] (2) Forming: pass the obtained product in (1) through a 120-mesh sieve, add a binder with a polyvinyl alcohol content of 5%, manually granulate, and dry-press under a pressure of 10-100 MPa to form a disc-shaped green body.

[0021] (3) Sintering: put the green body obtained in (2) into the crucible, add padding and sin...

Embodiment 2

[0025] All the other are the same as embodiment 1, and the self-excess of Ni is 5% in the step (1).

[0026] The X-ray diffraction pattern of the powder obtained by grinding the prepared ceramics of step (3) is as follows image 3 It can be seen that the prepared Y 2 NiMnO 6 is a pure phase; Y 2 NiMnO 6 The variation of the polarization value of ceramics with temperature under different magnetic fields is as follows: image 3 As shown, it can be seen that when there is no magnetic field, its polarization value is 154mC / m 2 , its polarization value becomes 117mC / m under the magnetic field of 5T 2 , its magnetoelectric coupling coefficient ME (magnetoelectric coupling coefficient ME={[P(0)-P(H)] / P(0)}*100%) reaches 24%.

Embodiment 3

[0028] All the other are the same as embodiment 1, and the self-excess of Ni is 7% in the step (1).

[0029] The X-ray diffraction pattern of the powder obtained by grinding the prepared ceramics of step (3) is as follows Figure 5 It can be seen that the prepared Y 2 NiMnO 6 is a pure phase; Y 2 NiMnO 6 The variation of the polarization value of ceramics with temperature under different magnetic fields is as follows: Image 6 As shown, it can be seen that in the absence of a magnetic field, its polarization value is 165mC / m 2 , its polarization value becomes 121mC / m under the magnetic field of 5T 2 , its magnetoelectric coupling coefficient ME (magnetoelectric coupling coefficient ME={[P(0)-P(H)] / P(0)}*100%) reaches 27%.

[0030] For multiferroic materials, it has been expected that its polarization value is large and the magnetoelectric coupling is strong. from Figure 7 It can be seen that by changing the percentage of Ni self-excess, not only can Y 2 NiMnO 6 The ...

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Abstract

The invention belongs to the technical field of physicochemical material preparation, and relates to a chemical preparation method for improving multiferroic performance of Y2NiMnO6 ceramic. A preparation method of Y2NiMnO6 ceramic comprises the steps of preparing yttrium nitrate, nickel nitrate, manganese acetate and the like into a dry sol by using a sol-gel method (wherein the self-overdose of Ni is 1% to 10%), and then drying, presintering, grinding, forming, and sintering, to form compact Y2NiMnO6 ceramic. According to the invention, multiferroic performance of Y2NiMnO6 ceramic is obviously improved.

Description

technical field [0001] The present invention relates to a method for improving Y 2 NiMnO 6 Methods for the properties of ceramic multiferroics. Background technique [0002] Multiferroic materials can exhibit ferroelectricity and ferromagnetism at the same time, and there is a magnetoelectric coupling between them, so that the mutual regulation of ferroelectricity and ferromagnetism can be realized (N.A.Spaldin and M.Fiebig, Science 309, 391( 2005); W. Eerenstein, N.D. Mathur, and J.F. Scott, Nature 442, 759 (2006); M. Bibes, and A. Barthélémy, Nature Mater. 7, 425 (2008)). Therefore, as a new type of functional material, multiferroic materials have broad application prospects in spintronics and other fields. In order to solve the mutual repulsion of electricity and magnetism in multiferroic materials, people have thought of several ways to obtain multiferroic materials. According to the origin of polarization, multiferroic materials can be divided into two categories. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C04B35/622
Inventor 宿杰郭云峰卢朝靖张大钧赵淑芳王珣珣
Owner QINGDAO UNIV
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