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Giant positive magnetoresistance complex function ceramic material and preparation thereof

A technology of ceramic materials and giant magnetoresistance, which is applied in the field of positive giant magnetoresistance composite functional ceramic materials and its preparation, can solve the problems of high requirements for preparation conditions, limitations in production and preparation, and complicated production processes, and achieve simple preparation processes, Conducive to industrial promotion and high efficiency

Inactive Publication Date: 2009-07-15
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these positive giant magnetoresistance materials and structures need to use precious metals such as gold and silver, etc., and the production process is complicated, the requirements for equipment are high, and relatively harsh preparation conditions such as high vacuum and protective atmosphere are required, which make their production and preparation subject to great challenges. limit
[0004] Chinese patents (publication numbers CN1588663A, CN1588662A) reported a class of Fe / C / Si and Fe / Co / Si composite film material systems with positive giant magnetoresistance effects at low field and near room temperature in 2005. The material has a 36% positive giant magnetoresistance effect at room temperature of 300K, but its production still requires a vacuum laser pulse deposition process, and the preparation conditions are relatively high
U.S. Patents (U.S.P6937967, USA; U.S.P6316131, USA) also reported narrow-band semiconductor materials (Ag 2+A Se and Ag 2+A Te) and structure (heterogeneous vdP disk composed of metal Au embedded in narrow-band semiconductor InSb), but its use of precious metals such as gold and silver, as well as complex preparation processes and harsh preparation conditions limit its application and promotion, and Its magnetoresistance effect is also limited below 300K

Method used

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  • Giant positive magnetoresistance complex function ceramic material and preparation thereof
  • Giant positive magnetoresistance complex function ceramic material and preparation thereof
  • Giant positive magnetoresistance complex function ceramic material and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The high-density blocks of the prepared initial samples Bi2212 phase and LCMO phase were ground for 60 minutes to form a powder material with an average particle size of 20um, and according to the composition formula (Bi2212 phase) 1-x (LCMO phase) x (Where x is the mass fraction, 00.5 (LCMO phase) 0.5 Composite functional materials. like figure 1 As shown, the powder x-ray diffraction pattern of the sample shows that the sample is a composite of Bi2212 phase and LCMO phase and there is no impurity phase; as image 3 As shown, the scanning electron microscope photo of the sample also shows that the grains of the sample are closely arranged, and it is a composite of Bi2212 phase and LCMO phase. There is no impurity phase, and the average grain size of the sample is about 20um; figure 2 As shown in (b), when x=0.5, the sample has the best positive giant magnetoresistance effect, and its magnetoresistance effect is still as high as more than about 30% at 300K, and at r...

Embodiment 2

[0033] The high-density blocks of the prepared initial samples Bi2212 phase and LCMO phase were ground for 60 minutes to form a powder material with an average particle size of 20um, and according to the composition formula (Bi2212 phase) 1-x (LCMO phase) x (Where x is the mass fraction, 00.8 (LCMO phase) 0.2 Composite functional materials. like figure 2 As shown in (c), when x=0.2, the sample has a larger positive giant magnetoresistance effect, and its magnetoresistance effect is still as high as more than about 25% at 300K, and the sample still has a magnetoresistance effect of about 20% at room temperature until 50°C. The positive giant magnetoresistance effect is more than 10%, and the sample also has a positive giant magnetoresistance effect as high as about 15% at 70°C.

Embodiment 3

[0035] The high-density blocks of the prepared initial samples Bi2212 phase and LCMO phase were ground for 60 minutes to form a powder material with an average particle size of 20um, and according to the composition formula (Bi2212 phase) 1-x (LCMO phase) x (where x is the mass fraction, 00.9 (LCMO phase) 0.1 Composite functional materials. like figure 2 As shown in (d), when x=0.1, the sample has a large positive giant magnetoresistance effect, and its magnetoresistance effect is still as high as more than about 20% at 300K, and the sample still has as high as about 16 The positive giant magnetoresistance effect of more than 10%, the sample also has a positive giant magnetoresistance effect of about 10% or more at 70°C.

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Abstract

The invention discloses a giant positive magnetoresistance composite functional ceramic material and a preparation method thereof. The composite functional ceramic material is composed of a perovskite oxide superconducting ceramic material Bi2212 phase and a giant magnetoresistance ceramic material LCMO phase, wherein, a composition formula thereof is (Bi2212 phase)1-x(LCMO phase)x, x is mass fraction and is more than 0 but not more than 0.5, the chemical formula of the Bi2212 phase is Bi2Sr2-a-bLaaCa1+bCu2O8, the chemical formula of the LCMO phase is La1-cCacMnO3, a equals 0.4, b equals 0.5 and C equals 1 / 3. The giant positive magnetoresistance composite functional ceramic material has the advantages of adopting a simple thermal compounding method, simple process and high efficiency. The material has relatively large controllable design space, and the giant positive magnetoresistance effect of the material can be effectively adjusted by changing experimental conditions, thus obtaining the composite functional ceramic material with different positive magnetoresistance effects.

Description

technical field [0001] The present invention relates to an information sensing functional material—a positive giant magnetoresistance composite functional material and a preparation method thereof, in particular to a bi2212 phase of a perovskite-like oxide superconducting ceramic material and a negative giant magnetoresistance ceramic material LCMO phase. A positive giant magnetoresistance composite functional ceramic material formed by phase compounding and a preparation method thereof. Background technique [0002] Functional materials and devices with magnetoresistance effect have been extensively and deeply studied because of their huge potential application value in the field of information and sensing. Magnetoresistance materials refer to a class of functional materials whose resistance can be significantly reduced or increased under the action of an external magnetic field. People usually use the relative change rate of resistivity to measure the magnitude of the mag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/453C04B35/50C04B35/622
Inventor 张建武张权
Owner UNIV OF SCI & TECH OF CHINA