Photoluminescence of the Dehydrated Ag-type Zeolite A Packed under Air(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• The photoluminescence (PL) and extended X-ray absorption fine structure (EXAFS) measurements have been carried out for the dehydrated fully Ag^+ exchanged zeolite A powders packed with controlled amounts of the adsorbed H_2O molecules. The powders are designated as "air-packed 12Ag-A" and have been prepared by packing the dehydrated 12Ag-A in the glass cell under air at different temperatures between 120 and 30℃ in the cooling process after the dehydration at 500℃ for 24h under air. The PL spectra obtained by radiation of 400nm light have main peaks around 2.15eV and subpeaks around 2.70eV. The PL spectra were fitted by four Gaussians. The peak around 2.15eV consists of the band I 〜1.94eV and band II 〜2.10eV, while the subpeak around 2.70eV of the band III 〜2.50eV and band IV 〜2.80eV. The temperature variations of the integral intensities for the bands II and IV show maxima between 50 and 80℃ where the interaction between the zeolite framework and the adsorbed H_2O molecules is found to become dominant by the infrared measurements. The integral intensities of the band I increase below 90℃. The analyses of the Ag K-edge EXAFS spectra obtained for the air-packed 12Ag-A reveal that there appears a silver cluster, Ag_5^<m+> (m≧3) which consists of two 6-ring Ag^+ ions and one 4-ring Ag^+ ion bonded to two 8-ring Ag atoms below 100℃. We conclude that the PL of the air-packed 12Ag-A is attributed to the Ag_5^<m+> clusters.

• 社団法人日本物理学会の論文
• 2008-06-15

著者

• Kimura Yoshifumi

  Faculty Of Science And Technology Hirosaki University

• HOSHINO Hideoki

  Faculty of Education,Hirosaki University

• Hoshino Hideoki

  Faculty Of Education Hirosaki University

• Azuhata Takashi

  Faculty Of Science And Technology Hirosaki University

• Miyanaga Takafumi

  Faculty of Science and Technology, Hirosaki University

• SANNOHE Yusuke

  Faculty of Education, Hirosaki University

• SUZUKI Yushi

  Faculty of Science and Technology, Hirosaki University

• YAGINUMA Keisuke

  Faculty of Education, Hirosaki University

• ITOH Michiru

  Faculty of Science and Technology, Hirosaki University

• SHIGENO Tomo

  Faculty of Science and Technology, Hirosaki University

• OSAWA Yumi

  Faculty of Science and Technology, Hirosaki University

• Miyanaga Takafumi

  Faculty Of Science And Technology Hirosaki University

• Shigeno Tomo

  Faculty Of Science And Technology Hirosaki University

• Osawa Yumi

  Faculty Of Science And Technology Hirosaki University

• Suzuki Yushi

  Faculty Of Science And Technology Hirosaki University

• Itoh Michiru

  Faculty Of Science And Technology Hirosaki University

• Sannohe Yusuke

  Faculty Of Education Hirosaki University

• Yaginuma Keisuke

  Faculty Of Education Hirosaki University

• Hoshino Hideoki

  Faculty of Education, Hirosaki University

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