Get access

Synthesis of Higher Chromium Oxides Using Ozone Gas

Authors

  • Ryosuke O. Suzuki,

    Corresponding author
    1. Department of Energy Science and Technology, Kyoto University, Kyoto 606-8501 Japan
      †Author to whom correspondence should be addressed. e-mail: rsuzuki@eng.hokudai.ac.jp
    Search for more papers by this author
    • Present address: Hokkaido University, Sapporo, Japan.

  • Takamichi Ogawa,

    1. Department of Energy Science and Technology, Kyoto University, Kyoto 606-8501 Japan
    Search for more papers by this author
    • §Present address: NGK Spark Plug Co. Ltd., Nagoya, Japan.

  • Ryosuke Kondo

    1. Department of Energy Science and Technology, Kyoto University, Kyoto 606-8501 Japan
    Search for more papers by this author
    • Present address: NTT West Ltd., Osaka, Japan.


  • D. Butt—contributing editor

  • Supported in part by Grants-in-Aid for Scientific Research, Japan, under Contract Nos. 09875182 and 10875128.

†Author to whom correspondence should be addressed. e-mail: rsuzuki@eng.hokudai.ac.jp

Abstract

Ozone gas in an ambient pressure was blown to Cr2O3 powder. The higher oxides, CrO3, Cr2O5, Cr5O12, and Cr3O8, could be synthesized above 373 K. Both CrO3 and Cr2O5 were found by in situ X-ray diffraction measurements. It was known that they could be produced only at high pressure of oxygen and at high temperatures. The CrO3 formed was melted at 470 K in an ozone atmosphere and decomposed above 500 K. Because of thermal decomposition of ozone and the higher oxides, no higher oxides were formed above 660 K. The phase formation was discussed using the kinetic stability diagram.

Get access to the full text of this article

Ancillary