CJCU

Chem. J. Chinese Universities ›› 2001, Vol. 22 ›› Issue (3): 368.

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The Valence and Transport Property Studies for the Solid Solution Ce1-x EuxO2-δ Synthesized by High-temperature and High-pressure

CHE Yu-Lu1, LI Li-Ping1,2, LI Guang-She1, LU Zhe1, LIN Xiao-Min1, XIANG Jun1,2,3   

  1. 1. Department of Physics;
    2. Key Laboratory of Inorganic Synthesisand Preparative Chemistry, Jilin University, Changchun 130023, China;
    3. International Center for Materials Physics, Academia Sinica, Shenyang 110015, China
  • Received:1999-11-01 Online:2001-03-24 Published:2001-03-24

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Abstract: The solid solutions Ce1-x Eux O2-δ ( x=0.10—0.50) were synthesized by high-temperature and high-pressure. The XRD measurement showed that the solid solution was crystallized in cubic fluorite-type structure and the lattice parameter increased with the content of Eu increasing up to x=0.4. The solution limit was ca. 0.4 under the condition of 3.6 GPa, 840—1020 ℃. The XPS data showed that the Eu ions are Eu 3+ and trace of Ce 4+ ions were reduced to Ce 3+ ions during synthesis of high temperature and high pressure. The ionic conduction for Ce0.8 Eu0.2 O2-δ was measured by impedance spectroscopy and it was found that the activation energy was 1.07 eVand the conductivity was 3.43×10-5 S·cm-1 at 550 ℃.

Key words: High-temperature and high-pressure, Valence state, Transport property

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