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Method for measuring Curie temperature of magnetic nanoparticles based on thermogravimetric change

A technology of magnetic nanoparticles and Curie temperature, applied in thermometers, thermometers, measuring devices and other directions using electrical/magnetic components that are directly sensitive to heat, can solve problems that cannot truly reflect the Curie temperature of magnetic nanoparticles and the isotropic magnetocrystalline Heterogeneous heterogeneity and other problems, to achieve the effect of reducing measurement cost, simple measurement method and convenient operation

Inactive Publication Date: 2020-08-07
DALIAN UNIV OF TECH
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Problems solved by technology

If the shape, size, and magnetic crystal anisotropy of the magnetic nanoparticles in the sample are not uniform, in essence, only the Curie temperature of some nanoparticles is measured, which cannot truly reflect the Curie temperature of the magnetic nanoparticles.

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  • Method for measuring Curie temperature of magnetic nanoparticles based on thermogravimetric change
  • Method for measuring Curie temperature of magnetic nanoparticles based on thermogravimetric change
  • Method for measuring Curie temperature of magnetic nanoparticles based on thermogravimetric change

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Embodiment Construction

[0023] The following will combine the technical implementation scheme and the description of the accompanying drawings Figure 4 The specific embodiment of the present invention will be introduced in detail.

[0024] A method for measuring the Curie temperature of magnetic nanoparticles based on thermogravimetric changes, comprising the following steps:

[0025] (1) Test sample preparation: the prepared Zn 0.54 co 0.46 Cr 0.6 Fe 1.4 o 4 Fully grind the magnetic nanoparticles, and then weigh about 10 mg of fine and loose samples for use;

[0026] (2) Zero adjustment: place the capped empty crucible 2 on the balance 4, and then place a 100*50*10mm directly above the balance 4 3 The magnet 1, the balance 4 is connected with the computer 3, such as figure 1 display; reset to zero after the balance display is stable;

[0027] (3) Measurement: Take out the crucible 2 from the balance 4, add the weighed sample into the crucible 2, cover the crucible lid and place it on the ba...

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Abstract

The invention discloses a method for measuring the Curie temperature of magnetic nanoparticles based on thermogravimetric change, and belongs to the field of measurement of magnetic materials. According to the method, a thermogravimetric analyzer is used for measuring an m-T curve of the magnetic nanoparticles under a static magnetic field, a tangent line is made at the maximum slope of the m-T curve, and the intersection point of the tangent line and a reverse extension line during curve balance is the curie temperature of the magnetic nanoparticles. According to the invention, a simple and economical thermogravimetric analyzer is adopted to measure the Curie temperature of the magnetic nanoparticles; the method is suitable for magnetic nanoparticle samples with non-uniform particle shapes, sizes and magnetocrystalline anisotropy constants. Any post-treatment on the magnetic nanoparticles to be measured is not needed during measurement, the operation is simple, the popularization is easy, the obtained result is consistent with the measurement result of the superconducting quantum interferometer magnetometer, and the measurement cost of the curie temperature of the magnetic nanoparticles is obviously reduced.

Description

technical field [0001] The invention belongs to the field of measurement of magnetic materials, relates to the measurement of magnetic properties of magnetic nanoparticles, in particular to a method for measuring the Curie temperature of magnetic nanoparticles based on thermogravimetric changes. Background technique [0002] Curie temperature is a secondary phase transition temperature of magnetic materials, which refers to the temperature at which the spontaneous magnetization in magnetic materials decreases to zero, and is the critical temperature at which (sub)ferromagnetism transforms into paramagnetism. When the temperature is lower than the Curie temperature, the magnetic material is (sub)ferromagnetic and is easily magnetized by an external magnetic field. When the temperature exceeds the Curie temperature, the magnetic material is paramagnetic, and it is difficult to be magnetized by an external magnetic field. [0003] Curie temperature is an important performance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01K7/36
CPCG01K7/36
Inventor 张伟余小刚吴承伟
Owner DALIAN UNIV OF TECH
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