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Method for synthesizing spinel structure magnesium frrite nano particles

A technology of magnesium ferrite and nano-powder, applied in magnesium compounds, iron compounds, chemical instruments and methods, etc., can solve problems such as environmental pollution, ensure product purity, reduce consumption and waste water discharge, and overcome difficulties in controlling precipitation. effect of the process

Inactive Publication Date: 2007-11-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the following defects: (1) high-temperature calcination and ball mi

Method used

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  • Method for synthesizing spinel structure magnesium frrite nano particles
  • Method for synthesizing spinel structure magnesium frrite nano particles
  • Method for synthesizing spinel structure magnesium frrite nano particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Extract Mg with naphthenic acid 2+ and Fe 3+ Preparation of Mg- and Fe-loaded organic phases

[0052] Under magnetic stirring, add an appropriate amount of ammonia water with a volume ratio of 1:1 to naphthenic acid (commercially available) for saponification, control the pH of the solution=10, and then add MgSO with a concentration of 0.2mol / L 4 solution, magnetically stirred for 0.5 h, and the organic phase was separated, washed with distilled water for 3 times to obtain a pure organic phase loaded with magnesium metal.

[0053] By controlling the pH of the solution to 3, the iron-loaded organic phase can also be prepared.

[0054] (2) Hydrothermal stripping of loaded metal-organic phase

[0055] by Mg 2+ : Fe 3+ =1:2 molar ratio Mix the organic phase loaded with metal magnesium and iron evenly, introduce it into the autoclave, add distilled water according to the volume ratio of the water phase and the organic phase as 1:4, adjust to 210°C after sealing, and...

Embodiment 2

[0060] (1) Extract Mg with naphthenic acid 2+ and Fe 3+ Preparation of magnesium- and iron-loaded organic phases: the same as in Example 1.

[0061] (2) Hydrothermal stripping of the metal-organic phase: the same as in Example 1 except that the temperature is 220°C.

[0062] (3) Product characterization

[0063] The transmission electron microscope photograph of the product is shown in Figure 5, and the test results obtained from the transmission electron microscope photograph are listed in Table 1.

Embodiment 3

[0065] (1) Extract Mg with naphthenic acid 2+ , Fe 3+ and La 3+ Preparation of the organic phase loaded with magnesium, iron and lanthanum is the same as in Example 1, and the pH of the solution is controlled to be 5, and the organic phase loaded with lanthanum can also be prepared.

[0066] (2) Hydrothermal stripping of the loaded metal-organic phase: the same as in Example 1, except that the temperature is 220° C., and the organic phases are mixed in a ratio of 1: 1.98: 0.02 in a molar ratio of magnesium, iron and lanthanum to obtain Lanthanum doped magnesium ferrite (MgLa 0.02 Fe 1.98 o 4 )product.

[0067] (3) Characterization of the product:

[0068] The XRD pattern measurement result of the product is shown in Figure 6. The transmission electron microscope photograph of the product is shown in Figure 7, and the test results obtained from the transmission electron microscope photograph are listed in Table 1. The hysteresis loop of the product is shown in Figure 12...

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Abstract

The invention relates to a kind of composed method of magnesium ferrite of spinel structure. It includes the following steps: extract trivalent iron ion and divalent iron ion in water phase through organic extractant, get predecessor of; absterge it with secondary distilled water for2-3 times and get pure load metal predecessor of organic phase; mix organic phase of Mg2+ and Fe3+ with mol rate of 1:2 and introduce them into autoclave, add distilled water according to the rate of 3:1 or 4:1 of organic phase and water phase and airproof it, and then mix it fiercely, stripping with hydrothermal method at temperature between 200 degree C and 300 degree C and make them react for 2.5 hours; cool it to the room temperature under natural condition, separate liquid and centrifugalize it, absterge it with absolute alcohol for 2-3 times and dry it at temperature of 50 degree C for 30-180 minutes, then get product of magnesium ferrite. The organic material in the invention can be used circularly, the cost is low; the craft is simple and energy consumption id low; the discharge of the waste water is low; it is convenient to control the size of particle of oxide deposition in the range of supermicron.

Description

technical field [0001] The invention belongs to the field of preparation of magnetic materials and semiconductor gas-sensitive materials, in particular to a method for synthesizing magnesium ferrite nanoparticles with a spinel structure. Background technique [0002] Molecular composition is MFe 2 o 4 (M=Mn, Fe, Co, Ni, Zn, Cd, Mg, Ba, etc.) spinel nanocomposite metal oxides are an important class of magnetic materials, with low price, good magnetic properties and absorbing properties, etc. Advantages, its magnetic properties have long received widespread attention. In MgFe 2 o 4 Mg does not have a magnetic moment, and the magnetic dipole is completely generated by Fe with a magnetic moment and is relatively weak, so in MgFe 2 o 4 The medium magnetic anisotropy will be lower than that of other metal cation spinel ferrites with magnetic moments. In recent years, MgFe 2 o 4 It was also found to have good gas-sensing performance, and it is a new type of n-type semicondu...

Claims

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Application Information

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IPC IPC(8): C01G49/00C01F5/00
Inventor 王兴尧韩珺圆杨桂琴
Owner TIANJIN UNIV
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