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

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...