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メリリット電解質 [CaNd]2[Ga]2[Ga2O7]2の5次元不相応の構造について
Fengxia Wei1, Tom Baikie, Tao An
1Division of Materials Science & Engineering, Nanyang Technological University, Singapore.
Journal of the American Chemical Society
|August 18, 2011
まとめ
メリライト型ガリウム酸化物は,固体酸化物燃料電池の電解質として有望を示しています. 独特の結晶構造により,酸素イオンの動きが容易になり,中間温度燃料電池の電解質性能が向上します.
科学分野:
- マテリアルサイエンス 材料科学
- 固体化学 固体化学
- クリスタログラフィーです.
背景:
- メリライト型ガリウム酸化物は,固体酸化物燃料電池 (SOFC) の電解質として調査されています.
- 中間温度のSOFCには,イオン伝導性が高い電解質が必要です.
研究 の 目的:
- メリライト型ガリウム酸化物の結晶構造を調査するために.
- 潜在的な電解質の応用のためのイオン拡散を可能にする構造的特徴を理解する.
主な方法:
- [CaNd](2) [Ga](2) [Ga(2) O(7) ](2) の単結晶は,光学浮遊ゾーン炉を使用して栽培されました.
- 伝送電子顕微鏡と粉末および単結晶X線 difraktionが構造分析に使用されました.
主要な成果:
- アニオン配列は,歪んだ五角形のトンネルでネットワークを形成し,構造的不適合に対応します.
- 5次元超空間グループ対称性P(4−) 2(1)m(α,α,0) 00s((a−) a,0) 000を,位移および職業的調節で決定した.
- 構造は,移動可能な酸素インタースティシャルを収容するために最適化されています.
結論:
- 調査されたメリライト型ガリウム酸化物は,イオン拡散に有利な構造特性を有しています.
- これらの材料の結晶化学的調整は,イオン伝導性を高め,中温の固体酸化物燃料電池の電解質としての性能を最適化することができます.
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