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Magnetic thermosensitive material manganese-doped holmium iron oxide as well as preparation methods of monocrystalline and polycrystalline thereof

A technology of temperature-sensitive materials and oxides, applied in chemical instruments and methods, single crystal growth, single crystal growth, etc., can solve the problems of limited practical application value, narrow critical temperature range, etc., and achieve the adjustable critical temperature of magnetic transition. , The effect of high magnetic transition temperature sensitivity and good application value

Inactive Publication Date: 2016-04-13
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The transition critical temperature range of this magnetic transition is narrow, which limits the practical application value of this kind of material to a certain extent.

Method used

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  • Magnetic thermosensitive material manganese-doped holmium iron oxide as well as preparation methods of monocrystalline and polycrystalline thereof
  • Magnetic thermosensitive material manganese-doped holmium iron oxide as well as preparation methods of monocrystalline and polycrystalline thereof
  • Magnetic thermosensitive material manganese-doped holmium iron oxide as well as preparation methods of monocrystalline and polycrystalline thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, a kind of HoFe of the magnetic temperature sensitive material of manganese-doped holmium iron oxide 0.55 mn 0.45 o 3 Polycrystalline preparation method using Ho 2 o 3 , MnO 2 and Fe 2 o 3 As a raw material, according to the raw material ratio of Ho:Fe:Mn:O atomic molar ratio of 1:0.55:0.45:3, HoFe was synthesized by solid state reaction method 0.55 mn 0.45 o 3 polycrystalline material.

[0023] In this example, the preparation of HoFe 0.55 mn 0.45 o 3 The specific steps for the synthesis of polycrystalline materials are:

[0024] a. Ho with a purity of 99.99% 2 o 3 , MnO 2 and Fe 2 o 3 Weigh according to the raw material ratio of Ho:Fe:Mn:O atomic molar ratio of 1:0.55:0.45:3, grind for 8 hours and mix evenly, pre-calcine at 1200°C for 24 hours to obtain polycrystalline powder;

[0025] b. Put the polycrystalline material powder prepared in step a into a mold, press it into a disc with a diameter of 25mm under a pressure of 20MP, an...

Embodiment 2

[0029] This embodiment is basically the same as Embodiment 1, especially in that:

[0030] In this embodiment, a kind of HoFe of the magnetic temperature sensitive material of manganese-doped holmium iron oxide 0.5 mn 0.5 o 3 Polycrystalline preparation method using Ho 2 o 3 , MnO 2 and Fe 2 o 3 As a raw material, according to the raw material ratio of Ho:Fe:Mn:O atomic molar ratio of 1:0.5:0.5:3, HoFe was synthesized by solid state reaction method 0.5 mn 0.5 o 3 polycrystalline material.

[0031] A small piece of the polycrystalline material prepared in this example was cut, and the single-phase property of the obtained sample was verified by X-ray diffraction.

[0032] The polycrystalline material prepared in this example was cut into small pieces, weighed, and the magnetic properties were tested with a comprehensive physical property measuring instrument (PPMS), and its spin reorientation temperature was obtained, and the spin reorientation temperature was measure...

Embodiment 3

[0034] This embodiment is basically the same as the previous embodiment, and the special features are:

[0035] In this embodiment, a kind of HoFe of the magnetic temperature sensitive material of manganese-doped holmium iron oxide 0.4 mn 0.6 o 3 Polycrystalline preparation method using Ho 2 o 3 , MnO 2 and Fe 2 o 3 As a raw material, according to the raw material ratio of Ho:Fe:Mn:O atomic molar ratio of 1:0.4:0.6:3, HoFe was synthesized by solid state reaction method 0.4 mn 0.6 o 3 polycrystalline material.

[0036] A small piece of the polycrystalline material prepared in this example was cut, and the single-phase property of the obtained sample was verified by X-ray diffraction.

[0037] The polycrystalline material prepared in this example was cut into small pieces, weighed, and the magnetic properties were tested with a comprehensive physical property measuring instrument (PPMS), and its spin reorientation temperature was obtained, and the spin reorientation te...

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Abstract

The invention discloses a magnetic thermosensitive material manganese-doped holmium iron oxide as well as preparation methods of monocrystalline and polycrystalline thereof. A solid reaction method is carried out with Ho2O3, MnO2 and Fe2O3 powder for synthesis of a HoFe1-xMnxO3 polycrystalline material, and the polycrystalline material grows into a monocrystalline material by an optical-floating-zone furnace method. Applied magnetic fields are not needed for assisting the magnetic thermosensitive material, magnetic transition temperature has a high susceptibility, the magnetic transition critical temperature can be adjusted for usage of the material at room temperature, and the material can be applied to a magnetic thermosensitive device. Ratio of the magnetic thermosensitive material can be changed, in order to obtain different materials whose magnetic transition critical temperature range is between -213.15 to 29.17 DEG C, so that the magnetic transition speed of the material is higher than the magnetic transition speed of the traditional material whose magnetic transition critical temperature is around the Curie temperature, and spontaneous magnetization happens at the temperature above the critical temperature, so that applied magnetic fields are not needed for induction before and after transition. The magnetic thermosensitive material is better than the traditional magnetic thermosensitive device material whose magnetic transition depends on the Curie temperature.

Description

technical field [0001] The invention relates to a magnetic material, in particular to a ferrite temperature-sensitive material, which is applied in the technical fields of temperature-sensitive functional materials and temperature-sensitive electronic devices. Background technique [0002] The existing magnetic temperature sensitive switches mainly use soft magnetic ferrite materials as temperature sensitive magnetic materials, which are mainly used in magnetic sensors and electronic devices, especially in communication, home appliances, automobiles, industry, medical treatment, security and other fields. This traditional ferrite temperature-sensitive material is based on the obvious ferromagnetic-paramagnetic transition of the magnetic material near the Curie temperature. The transition critical temperature range of this magnetic transition is narrow, which limits the practical application value of this kind of material to a certain extent. In addition, this magnetic tempe...

Claims

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Application Information

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IPC IPC(8): C30B28/02C30B29/24
CPCC30B28/02C30B29/24
Inventor 方依霏张金仓吴志魏卢霄文钱小龙曹世勋
Owner SHANGHAI UNIV
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