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Magneto-electric coupled ceramic materials and preparing method thereof

A ceramic material and magnetoelectric coupling technology, which is applied in the field of magnetoelectric coupling ceramic materials and its preparation, can solve problems such as difficult to detect saturated polarization electric field loops and small breakdown electric field of ceramics

Inactive Publication Date: 2005-04-06
NANJING UNIV
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  • Abstract
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Problems solved by technology

At present, some people have used the traditional solid-state sintering method to prepare Bi 1-x A x Fe 1-y B y o 3 series of ceramics, but the breakdown electric field of the ceramics prepared by them is very small, and it is difficult to measure the saturated polarization-electric field loop [A.V.Zalesskii, A.A.Frolov, T.A.Khimich, and A.A.Bush, Physics of the Solid State45, 141(2003); I. Sosnowska, W. Schöfer, W. Kockelmann, K.H. Andersen, I.O. Troyanchuk, Appl. Phys. A 74, S1040 (2002); V.L. Mathe, K.K. Patankar, R.N.Patil, C.D. , 380(2004); V.L.Mathe, Journal of Magnetism and Magnetic Materials 263, 344(2003).]

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  • Magneto-electric coupled ceramic materials and preparing method thereof
  • Magneto-electric coupled ceramic materials and preparing method thereof

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Embodiment Construction

[0023] The following examples can enable those skilled in the art to understand the present invention more fully, but do not limit the present invention in any way.

[0024] Table 1. Bi that has been prepared by others 1-x A x Fe 1-y B y o 3 Ceramic materials and their remnant polarization and breakdown voltage

[0025]

[0026] The specific preparation method of the magnetoelectric coupling ceramic material of the present invention:

[0027] a) Using Bi 2 o 3 , La 2 o 3 , Fe 2 o 3 、Td 2 o 3 、Nd 2 o 3 、Sm 2 o 3 , Mn 2 o 3 、Co 2 o 3 、Pr 2 o 3 powder or corresponding carbonate and nitrate powder as raw material, according to Bi 1-x A x Fe 1-y B y o 3 (0≤x3+ 、Nd 3+ 、Td 3+ 、Sm 3+ 、Pr 3+ One or two of them, B is the transition metal ion Mn 3+ 、Co 3+ One of them, the specific composition is shown in Table 2) the stoichiometric batching of series ceramics.

[0028] b) After batching, put the powder into an agate jar and grind for more than 12 hour...

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Abstract

The invention discloses a magneto-electric coupling ceramics material. Its chemical formula is (Bi1-xAxFe1-yByO3), and 0<=x<0.5, 0<=y<0.2, x, y can not equal 0 in the same time. an is trivalency rare earth metal ion selected one or two kinds from La, Nd, Td, Sm and Pr. B is a transition metal ion Mn or Co. The material has following physical property: breakdown electric field is over 150kV / cm, its breakdown electric field is between 3 microcoulomb per square centimeter to 30 microcoulomb per square centimeter. Meanwhile, the invention discloses the method to produce the material. Its feature is when sintering, temperature would increase at the speed of 30 degree per second and stabilizing between 850 degree centigrade and 940 degree centigrade, then cooling quickly.

Description

technical field [0001] The invention relates to a magnetoelectric coupling ceramic material and a preparation method thereof. Background technique [0002] Ferroelectric magnets or magnetoelectric coupling materials have both ferroelectricity and ferromagnetic (antiferromagnetic) properties, and coupling between ferroelectric polarization and ferromagnetic (antiferromagnetic) spins can occur, resulting in new physical effects, That is to say, the magnetism of such materials can be changed by applying an electric field or the ferroelectricity of such materials can be changed by applying a magnetic field. The ferromagnetic Curie temperature of general single-phase ferroelectromagnets is relatively low, such as Pb (Nb 1 / 2 Fe 1 / 2 )O 3 The ferromagnetic Curie temperature is around -160°C. BiFeO 3 It is a material whose ferroelectric Curie temperature (~700°C) and ferromagnetic Curie temperature (~370°C) are both above room temperature, which is rare among existing single-pha...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/32C04B35/36C04B35/453C04B35/622C04B35/64
Inventor 袁国亮刘俊明王一平刘治国
Owner NANJING UNIV
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