Standard Gibbs Energy of Formation of Zn8La Determined by Solution Calorimetry and Measurement of Heat Capacity from Near Absolute Zero Kelvin

• Morishita Masao

  Department of Materials Science and Chemistry, University of Hyogo

• Yamamoto Hiroaki

  Department of Materials Science and Chemistry, University of Hyogo

• Tsuboki Kohei

  Department of Materials Science and Chemistry, University of Hyogo

• Matsumoto Yasutomo

  Department of Materials Science and Chemistry, University of Hyogo

書誌事項

タイトル別名

• Standard Gibbs Energy of Formation of Zn<SUB>8</SUB>La Determined by Solution Calorimetry and Measurement of Heat Capacity from Near Absolute Zero Kelvin

抄録

The thermodynamic properties of Zn₈La were investigated by calorimetry. The standard entropy of formation at 298 K, Δ_fS₂₉₈^°, was determined from measuring the heat capacities, C_p, from near absolute zero (2 K) to 300 K by the relaxation method. The standard enthalpy of formation at 298 K, Δ_fH₂₉₈^°, was determined by solution calorimetry in hydrochloric acid solution. The standard Gibbs energy of formation at 298 K, Δ_fG₂₉₈^°, was determined from these data. The results obtained were as follows: Δ_fH₂₉₈^°(Zn₈La)/kJ·mol⁻¹ = −297.18±18; Δ_fS₂₉₈^°(Zn₈La)/J·mol⁻¹·K⁻¹ = −25.02±3.60; Δ_fG₂₉₈^°(Zn₈La)/kJ·mol⁻¹ = −289.71±18. The coefficient, γ, of the electronic term contributing to the heat capacity of Zn₈La was small, indicating that decrease of the density of states for 4f component of the lanthanum atom in the vicinity of E_F.

収録刊行物

• MATERIALS TRANSACTIONS

  MATERIALS TRANSACTIONS 47 (6), 1555-1559, 2006

  公益社団法人 日本金属学会

キーワード

• Zn<SUB>8</SUB>La
• calorimetry
• heat capacity
• enthalpy of formation
• Gibbs energy of formation

詳細情報

• CRID: 1390282679227486976
• NII論文ID: 130004453169
• NII論文ID: 10018160630
• NII書誌ID: AA1151294X
• DOI: 10.2320/matertrans.47.1555
• ISSN: 13475320
• ISSN: 13459678
• NDL書誌ID: 7951101
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7951101
• Web Site: https://www.jstage.jst.go.jp/article/matertrans/47/6/47_6_1555/_pdf
• 本文言語コード: en
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