中华医学超声杂志

应用化学 ›› 1998, Vol. 0 ›› Issue (2): 115-116.

• 研究论文 • 上一篇    下一篇

Fe2O3-TiO2-K2O复合氧化物体系结构与湿敏性能

储向峰, 刘杏芹, 王弘   

  1. 中国科学技术大学材料科学与工程系 合肥230026
  • 收稿日期:1997-04-30 修回日期:1997-09-29 出版日期:1998-04-10 发布日期:1998-04-10

Structure and Humidity Sensitivity of Complex Oxides Fe2O3-TiO2-K2O

Chu Xiangfeng, Liu Xingqin, Wang Hong   

  1. Department of Materials Science and Engineering, China Universityof Science and Technology, Hefei 230026
  • Received:1997-04-30 Revised:1997-09-29 Published:1998-04-10 Online:1998-04-10

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摘要： Fe2O3是一种湿敏材料[1,2],由于其阻值高,感湿特性差,在Fe2O3中掺入K2CO3降低了材料阻值,改善了感湿灵敏度.在烧结过程中生成β-K2O、KFe11O17相使材料的湿滞增大,稳定 性降低[3].为了改善Fe2O3-K2O体系材料湿敏性能,我们掺入适量的TiO2组成Fe2O3-TiO2-K2O体系,探讨了TiO2对材料性能的影响,确定了最佳组成与制备条件,所得Fe2O3-TiO2-K2O湿敏材料比纯Fe2O3、TiO2和LaFeO3[4]有较高的感湿灵敏度,湿滞小,响应恢复性能好.

关键词: Fe2O3-TiO2-K2O, 复合氧化物, 湿度传感器

Abstract: A series of sintered complex oxides were prepared from α-Fe2O3 and K2CO3 (in molar ratio of 95:5) with addition of TiO2. The XRD results showed that addition of TiO2 increased the porosity of the mixed oxides and eliminated the formation of β-K2O and KFe11O17 phases, which usually cause the hysteresis of such a material.

Key words: Fe2O3-TiO2-K2O, complex oxide, hymidity sensor

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