Conductivity measurement of scandium doped barium zirconate for fuel cell application

Susumu Imashuku, Tetsuya Uda, Yasuhiro Awakura

研究成果: Conference contribution

抄録

A pseudoternary phase diagram of the BaO-ZrO2-ScO1.5 system is established and the conductivities of the scandium-doped barium zirconate are measured in wet conditions. According to the phase diagram, the molar fraction of scandia in the barium zirconate phase that equilibrates with the cubic zirconia (ZrO2) and scandia (Sc2O3) phase is 0.03. On the composition line, where the molar fraction of barium oxide (BaO) is 0.50, the solubility of scandia into barium zirconate is 0.27 as a molar fraction of scandia. At around 500°C, the conductivities of scandium-doped barium zirconate are estimated to be almost same as that of yttrium-doped barium zirconate. The activation energies for bulk proton conduction in scandium-doped barium zirconate (0.57 eV for BaZr 0.90Sc0.10O3-δ) are higher than that of yttrium-doped barium zirconate (0.44 eV for BaZr0.90Y 0.10O3-δ). In addition, the bulk conductivity of scandium-doped barium zirconate in this study is 10 times higher than the reported conductivities in the temperature range of 75°C to 300°C.

本文言語English
ホスト出版物のタイトルSohn International Symposium
ホスト出版物のサブタイトルAdvanced Processing of Metals and Materials - Proceedings of the International Symposium
ページ519-531
ページ数13
6
出版ステータスPublished - 2006 12月 1
外部発表はい
イベント2006 TMS Fall Extraction and Processing Division: Sohn International Symposium - San Diego, CA, United States
継続期間: 2006 8月 272006 8月 31

Other

Other2006 TMS Fall Extraction and Processing Division: Sohn International Symposium
国/地域United States
CitySan Diego, CA
Period06/8/2706/8/31

ASJC Scopus subject areas

  • 工学(全般)

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