Search

Article

x

留言板

尊敬的读者、作者、审稿人, 关于本刊的投稿、审稿、编辑和出版的任何问题, 您可以本页添加留言。我们将尽快给您答复。谢谢您的支持!

姓名
邮箱
手机号码
标题
留言内容
验证码

Room-temperature ferromagnetism in bulk CoxTi1-xO2-δ induced by the phase transformation in the hydrogenation sintering process

Kong Ling-Gang Kang Jin-Feng Wang Yi Liu Li-Feng Liu Xiao-Yan Zhang Xing Han Ru-Qi

Room-temperature ferromagnetism in bulk CoxTi1-xO2-δ induced by the phase transformation in the hydrogenation sintering process

Kong Ling-Gang, Kang Jin-Feng, Wang Yi, Liu Li-Feng, Liu Xiao-Yan, Zhang Xing, Han Ru-Qi
PDF
Get Citation
Metrics
  • Abstract views:  3604
  • PDF Downloads:  1157
  • Cited By: 0
Publishing process
  • Received Date:  10 June 2005
  • Accepted Date:  20 September 2005
  • Published Online:  20 March 2006

Room-temperature ferromagnetism in bulk CoxTi1-xO2-δ induced by the phase transformation in the hydrogenation sintering process

  • 1. 北京大学微电子学研究所,北京 100871

Abstract: Paramagnetic (Co3O4)x/3(TiO2)1- x(03O4 and TiO2 from 700 ℃ to 1000 ℃ in air. X-ray diffraction (XRD) re sults showed that perovskite CoTiO3 existed in all samples. Anatase p hase was also detected in samples sintered at 700 ℃ and when sintering the mixt ure at above 900 ℃, rutile phase formed with anatase phase disappearing. All sa mples exhibited room-temperature ferromagnetism (RTFM) after being hydrogenated in 10% H2/Ar mixed atmosphere for 1 hour at 500 ℃. X-ray photoelect ron spectroscopy (XPS) showed that Co existed in the +2 formal oxidation state, and no Co clusters were detected. XRD showed that CoTiO3 disappeared and a new phase CoxTi1-xO2-δ formed after hyd rogenation. It is suggested that hydrogenation causes the phase transformation f rom CoTiO3 to CoxTi1-xO2-δ. RTFM of the sample originates from the intrinsic ferromagnetism of CoxTi1-xO2-δ. The exchange interaction between Co2+ occ urring with the phase transformation may be the essential reason for RTFM.

Catalog

    /

    返回文章
    返回