Acta Chimica Sinica ›› 2002, Vol. 60 ›› Issue (4): 622-626. Previous Articles     Next Articles

Original Articles

ZrO_2表面上Zr~(3+)中心上的O_2吸附平衡

王新平;赵沁;蔡天锡   

  1. 大连理工大学化工学院,大连(116012)
  • 发布日期:2002-04-15

Adsorption Equilibrium of O_2 on Zr~(3+) Center Located on the Surface of Zirconia

Wang Xinping;Zhao Qin;Cai Tianxi   

  1. State Key Laboratory of Fine Chemicals, Dalian University of Technology,Dalian(116012)
  • Published:2002-04-15

The changes of signal intensity oF Zr~(3+) centers of ZrO_2 nanopowder in various gases (He, H_2, O_2, air and wet air) and at different annealing temperatures have been studied by means of ESR. On the surface of ZrO_2, about 1 * 10~(-7) mol·g of Zr~(3+) centers were detected, which are the oxygen coordinatively unsaturated Zr ions. It is found that the concentration of Zr~(3+) center changes reversibly and quickly with O_2 partial pressure in various gases. This result reveals that the Zr~(3+) centers are mainly on the surface of ZrO_2 and their concentration is related to O_2 adsorption equilibrium. Based on the quantitative ESR analysis and particle size data of ZrO_2, the present authors propose that the oxygen coordinatively unsaturated Zr~(3+) centers should be located at the crystal corners of ZrO_2 initial particles.

Key words: ZIRCONIUM OXIDE, ADSORPTION, ESR, OXYGEN

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