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Method for preparing double perovskite magnetic material Sr2MWO6(M=Fe or Mn)

A magnetic material, double perovskite technology, applied in the field of preparation of double perovskite magnetic material Sr2MWO6, can solve the problems of difficult removal of impurities, high reaction temperature, long time, etc., achieve short reaction time, low reaction temperature, and method easy effect

Inactive Publication Date: 2006-12-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of synthetic route has high reaction temperature and long time, the atmosphere of the reaction must be strictly controlled, repeated grinding and sintering is required and SrWO 4 Impurities are difficult to remove and other disadvantages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1: Double perovskite oxide Sr 2 FeWO 6 preparation of

[0009] Adopt sol-gel method to synthesize product, get respectively 4.26g strontium nitrate (20.00mmol), 4.10g ferric nitrate (10.00mmol), 2.73g ammonium paratungstate (0.83mmol), dissolve each nitrate and ammonium salt with 14mL deionized water, A sol was obtained by adding 16.81 g of citric acid (80 mmol) and 4 mL of ethylene glycol. Heat the sol at 60°C until it forms a gel; dry it at 130°C to make a xerogel. The dry gel was calcined at 700°C for 5 hours to obtain oxide powder. Put the pre-fired powder into a corundum crucible, sinter in a muffle furnace at 1000°C under a reducing atmosphere for 40 hours, and cool to room temperature to obtain a double perovskite oxide Sr 2 FeWO 6 . The product is a single-phase polycrystalline structure, belonging to the monoclinic system.

Embodiment 2

[0010] Example 2: Double perovskite oxide Sr 2 wxya 6 preparation of

[0011] Adopt sol-gel method to synthesize product, get 4.26g strontium nitrate (20.00mmol), 3.58g manganese nitrate solution (10.00mmol), 2.73g ammonium paratungstate (0.83mmol) respectively, dissolve each nitrate and ammonium salt with 14mL deionized water , 16.81 g of citric acid (80 mmol) and 4 mL of ethylene glycol were added to obtain a sol. The sol was heated at 60°C until a gel was formed; dried at 80°C to make a xerogel. The dry gel was calcined at 700°C for 10 hours to obtain oxide powder. Put the pre-fired powder into a corundum crucible, sinter in a muffle furnace at 1000°C under a reducing atmosphere for 20 hours, and then cool to room temperature to obtain a double perovskite oxide Sr 2 wxya 6 . The product is a single-phase polycrystalline structure, belonging to the tetragonal crystal system.

Embodiment 3

[0012] Example 3: Double perovskite oxide Sr 2 FeWO 6 preparation of

[0013] Adopt sol-gel method to synthesize product, get respectively 4.26g strontium nitrate (20.00mmol), 4.10g ferric nitrate (10.00mmol), 2.73g ammonium paratungstate (0.83mmol), dissolve each nitrate and ammonium salt with 43mL deionized water, A sol was obtained by adding 16.81 g of citric acid (80 mmol) and 4 mL of ethylene glycol. Heat the sol at 65°C until it forms a gel; dry it at 110°C to make a xerogel. The dry gel was calcined at 700°C for 8 hours to obtain oxide powder. Put the pre-fired powder into a corundum crucible, sinter in a muffle furnace at 1000°C in a reducing atmosphere for 30 hours, and cool to room temperature to obtain a double perovskite oxide Sr 2 FeWO 6 . The product is a single-phase polycrystalline structure, belonging to the monoclinic system.

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Abstract

The provided preparation method for a Sr2MWO6 (M = Fe or Mn) material comprises: using the Sr(NO3)2, Fe(NO3)3, Mn(NO3)4 and ammonium paratungstate as material, citric acid as complexant, and ethylene glycol as dispersant; reacting for 20-40h at 950-1150Deg to obtain the biperovskite-structure product. This invention uses sol-gel technique with low temperature and short time, removes the SrWO4 in solid phase reaction, and fit to large-scale production.

Description

technical field [0001] The invention relates to a double perovskite magnetic material Sr 2 MWO 6 (M=Fe, or Mn) preparation method. Background technique [0002] In 1998 double perovskite structure oxide Sr 2 FeMoO 6 The rediscovery that polycrystalline samples have a large magnetoresistance effect at room temperature has aroused people's research interest for their unique structure and electromagnetic properties, and has good application prospects in magnetic sensors and magnetic memory devices. In particular, some double perovskite structure oxides have semi-metallic properties, and the spin polarization is close to 100%, which is expected to be used as spin electron injection materials. Research in this field has become a hot spot in theoretical physics and material science. Since the existing double perovskite structure oxides still cannot meet the requirements of having a large magnetoresistance effect at room temperature and low magnetic field, people continue to ex...

Claims

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Application Information

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IPC IPC(8): H01F1/01C04B35/495C04B35/622
Inventor 田世哲李海东范燕迪赵娜娜姬相玲
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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