The effect of Gd content on microstructure and magnetic properties of sintered Nd33.03-xGdxFe65.65B1.32 （x=0-2） was studied in this paper to improve the thermal stability of NdFeB and to reduce the raw material cost...The effect of Gd content on microstructure and magnetic properties of sintered Nd33.03-xGdxFe65.65B1.32 （x=0-2） was studied in this paper to improve the thermal stability of NdFeB and to reduce the raw material cost. The results showed that better magnet performance could be obtained by adding Gd （0-1.5 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32. It was also found that the Nd33.03-xGdxFe65.65B1.32 magnets showed the best performance when Gd addition increased to 1.0 wt.%. The temperature coefficient Br （α） could be improved from -0.15%/oC to -0.063%/oC （maximum work temperature 120 oC） and the Curie temperature could be improved from 315 oC to 323 oC because the Gd2Fe14B had positive temperature coefficient Br （α） and higher Curie temperature than that of Nd2Fe14B. The coercivity could be improved from 10.2 to 11.48 kOe and the microstructure was close to ideal microstructure. The magnetic performance decreased sharply by adding Gd （above 2 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32 because the Gd element concen-trated in the grain boundaries.展开更多
Sulfosalicylic acid(SSA) was used as an intercalation agent and an excellent antenna to synthesize layered rare-earth hydroxide(LRH) materials and directly obtain SSA-modified terbium-doped ytterbium hydroxide nanoshe...Sulfosalicylic acid(SSA) was used as an intercalation agent and an excellent antenna to synthesize layered rare-earth hydroxide(LRH) materials and directly obtain SSA-modified terbium-doped ytterbium hydroxide nanosheets by mechanical exfoliation. The crystal structure and morphologies of the LRHs and nanosheets were determined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The particle size and zeta potential of the prepared nanosheets were also analyzed. The as-prepared nanosheets exhibited excellent luminescent properties. The positively charged nanosheets were electrophoretically deposited on a conductive glass to form a thin film. The luminescence of this thin film can be quenched by chromate(CrO_4^(2–)) and bilirubin(BR), which shows good sensing properties. The quenching mechanism of the sensing film by CrO_4^(2–) and BR was discussed based on the spectra and structure of the film.展开更多
基金Project supported by Application of Rare Earth Project of Ministry of Industry and Information Technology of the People's Republic of China (2010 No.1)
文摘The effect of Gd content on microstructure and magnetic properties of sintered Nd33.03-xGdxFe65.65B1.32 （x=0-2） was studied in this paper to improve the thermal stability of NdFeB and to reduce the raw material cost. The results showed that better magnet performance could be obtained by adding Gd （0-1.5 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32. It was also found that the Nd33.03-xGdxFe65.65B1.32 magnets showed the best performance when Gd addition increased to 1.0 wt.%. The temperature coefficient Br （α） could be improved from -0.15%/oC to -0.063%/oC （maximum work temperature 120 oC） and the Curie temperature could be improved from 315 oC to 323 oC because the Gd2Fe14B had positive temperature coefficient Br （α） and higher Curie temperature than that of Nd2Fe14B. The coercivity could be improved from 10.2 to 11.48 kOe and the microstructure was close to ideal microstructure. The magnetic performance decreased sharply by adding Gd （above 2 wt.%） with partial substitution of Nd in Nd33.03-xGdxFe65.65B1.32 because the Gd element concen-trated in the grain boundaries.
文摘Sulfosalicylic acid(SSA) was used as an intercalation agent and an excellent antenna to synthesize layered rare-earth hydroxide(LRH) materials and directly obtain SSA-modified terbium-doped ytterbium hydroxide nanosheets by mechanical exfoliation. The crystal structure and morphologies of the LRHs and nanosheets were determined by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy. The particle size and zeta potential of the prepared nanosheets were also analyzed. The as-prepared nanosheets exhibited excellent luminescent properties. The positively charged nanosheets were electrophoretically deposited on a conductive glass to form a thin film. The luminescence of this thin film can be quenched by chromate(CrO_4^(2–)) and bilirubin(BR), which shows good sensing properties. The quenching mechanism of the sensing film by CrO_4^(2–) and BR was discussed based on the spectra and structure of the film.
