Thermodynamic and Magnetic Properties of GdPd Hydride

• Hara Masanori

  Hydrogen Isotope Research Center, University of Toyama

• Nakazawa Takayuki

  Faculty of Engineering, University of Toyama

• Akamaru Satoshi

  Hydrogen Isotope Research Center, University of Toyama

• Watanabe Kuniaki

  Hydrogen Isotope Research Center, University of Toyama

• Nishimura Katsuhiko

  Faculty of Engineering, University of Toyama

• Mori Katsunori

  Faculty of Engineering, University of Toyama

• Matsuyama Masao

  Hydrogen Isotope Research Center, University of Toyama

抄録

Thermodynamic and magnetic properties of GdPd hydride (deuteride) were studied. Each of the pressure-composition isotherms of GdPd-Q (Q=H or D) systems showed a plateau region in 0.05<[Q]/[GdPd]<0.4, though hydrogen induced disproportionation of GdPd was observed above [Q]/[GdPd]>0.4. The disproportionation products were determined to be GdQ₂ and Gd₃Pd₄. Enthalpy changes for GdPd hydride formation at [Q]/[GdPd]=0.2 were evaluated from the isotherms to be ΔH_f^°=−130 kJ/mol_H2 and −122 kJ/mol_D2. Magnetization measurements revealed that the effective magnetic moments of GdPd and its hydride were approximately the same as that of Gd³⁺. This indicates that magnetic properties of GdPd and its hydride are governed by gadolinium atoms. In fact, the magnetic ordering temperature and the paramagnetic Curie temperature were also found to be almost invariable with hydrogen content, revealing that electrons from the 1s orbital of absorbed hydrogen bring little influence on the nature of 4f-electrons of gadolinium.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 49 (6), 1428-1433, 2008

  公益社団法人 日本金属学会

キーワード

• rare-earth
• palladium
• GdPd
• hydride formation
• disproportionation
• isotherm
• magnetic ordering temperature
• curie temperature
• effective magnetic moment

詳細情報

• CRID: 1390001204249412224
• NII論文ID: 10021147773
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.mra2007307
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 9519525
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I9519525
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/49/6/49_MRA2007307/_pdf
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可