Infrared Absorption Spectra of High Temperature Proton Conducting Ca2+-Doped La2Zr2O7

Takahisa Omata, Shinya Otsuka-Yao-Matsuo

研究成果: Article査読

23 被引用数 (Scopus)

抄録

Infrared (IR) absorption spectra of pyroehlore-type Ca2+-doped La2r2O7 proton conductors, i.e., (La2, Ca,)Zr2O7 .. δ and La2(Zr2, Ca,)O7 δ systems, were studied by the diffuse reflection method. The O-H stretching vibrations (vOH) due to the protons dissolved in the crystal with negligible effects of adhesion and/or adsorption water could be detected by improvement of the Sample preparation and the diffuse reflection technique. The vOH bands, due to protons dissolved in the crystal, were distinctly different between the (La2, Ca,)Zr2O7 δ systems; three vOH bands at 3517, 3401, and 3323 cm-1 for the (La2, Ca,)Zr2O7 δ system and six vOH bands at 3517, 3430, 3414, 3371, 3341, and 3289 cm1 for the La2(Zr2 Ca2)O7 - δ system were observed. The stable sites for dissolved protons were distinctly different between the two systems. The wave numbers and the widths of the vOH bands were higher and much sharper than those reported for the well-known perovskite-related-type proton conductors. It was concluded that the O-H bonds in Ca2+-doped La2Zr2O7 crystal are tight compared with perovskite-related-type proton conductors, and that definite stable sites for protons exist in Ca2+-doped La2Zr2O7 crystal, In the 1R spectra of (La2, Ca,)Zr2O7- δ samples with various water vapor pressures, PH2O, of proton dissolution treatment, the preferred dissolution of protons into the specific site was observed under low PH2O atmosphere. The details of the dissolution environment of protons are also discussed.

本文言語English
ページ(範囲)e475-e482
ジャーナルJournal of the Electrochemical Society
148
12
DOI
出版ステータスPublished - 2001
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 再生可能エネルギー、持続可能性、環境
  • 表面、皮膜および薄膜
  • 電気化学
  • 材料化学

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