Pr_1−<i>x</i>Sr_<i>x</i>MnO₃ (0.1≦<i>x</i>≦0.3)とLa_1−<i>x</i>Sr_<i>x</i>FeO₃ (0.1≦<i>x</i>≦0.3)のP型熱電特性

• 中津川 博

  横浜国立大学大学院工学研究院

• 窪田 正照

  横浜国立大学大学院工学府

• 齋藤 美和

  神奈川大学工学部物質生命化学科

書誌事項

タイトル別名

• P-Type Thermoelectric Properties of Pr_1−<i>x</i>Sr_<i>x</i>MnO₃ (0.1≦<i>x</i>≦0.3) and La_1−<i>x</i>Sr_<i>x</i>FeO₃ (0.1≦<i>x</i>≦0.3)
• Pr₁₋xSr[x]MnO₃ (0.1≦x≦0.3)とLa₁₋xSr[x]FeO₃ (0.1≦x≦0.3)のP型熱電特性
• Pr ₁ ₋ xSr[x]MnO ₃ (0.1 ≦ x ≦ 0.3)ト La ₁ ₋ xSr[x]FeO ₃ (0.1 ≦ x ≦ 0.3)ノ Pガタ ネツデントクセイ
• P-Type Thermoelectric Properties of Pr_{1&minus;<i>x</i>}Sr_<i>x</i>MnO₃ (0.1≦<i>x</i>≦0.3) and La_{1&minus;<i>x</i>}Sr_<i>x</i>FeO₃ (0.1≦<i>x</i>≦0.3)

抄録

  In this study, polycrystalline samples of Pr_1−xSr_xMnO₃ (0.1≦x≦0.3) and La_1−xSr_xFeO₃ (0.1≦x≦0.3) were synthesized using a conventional solid-state reaction method. We investigated crystal structure, magnetic susceptibility (χ), and P-type thermoelectric properties, such as electrical resistivity (ρ), Seebeck coefficient (S), and thermal conductivity (κ), as a function of temperature (T) or Sr content (x). The perovskite structure at room temperature showed orthorhombic Pbnm phases for all samples. The samples for Pr_1−xSr_xMnO₃ (0.1≦x≦0.3) showed the ferromagnetic-like ground state below Curie temperature. Conversely, the samples for La_1−xSr_xFeO₃ (0.1≦x≦0.3) showed the antiferromagnetic-like ground state below Néel temperature. Although the samples for Pr_1−xSr_xMnO₃ (x=0.1 and 0.2) showed a large positive S below room temperature, the carrier type changed from hole-like to electron-like behavior above 1000 K and 500 K, respectively. On the other hand, the samples for La_1−xSr_xFeO₃ (0.1≦x≦0.3) showed a large positive S over the whole temperature range. The largest dimensionless figure of merit (ZT) in the specimen for La_0.7Sr_0.3FeO₃ was attaining a maximum value of 0.14 at 1000 K, by a decrease in both ρ and κ, and an increase in S. Recently, the coefficient of linear thermal expansion of La_1−xSr_xFeO₃ has achieved the value which is equivalent to that of N-type CaMnO₃. We expect that La_0.7Sr_0.3FeO₃ is one of the candidate P-type materials for the oxide thermoelectric elements consisting of the same type of crystal structure.<br>

収録刊行物

• 日本金属学会誌

  日本金属学会誌 79 (11), 597-606, 2015

  公益社団法人 日本金属学会

キーワード

• thermoelectric properties
• magnetic properties
• perovskite structure
• dimensionless figure of merit
• Heikes formula

詳細情報

• CRID: 1390282681458664448
• NII論文ID: 130005105625
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet.ja201516
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 026843352
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I026843352
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet/79/11/79_JA201516/_pdf
• 本文言語コード: ja
• データソース種別:
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  • NDL
  • Crossref
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  • KAKEN
• 抄録ライセンスフラグ: 使用不可