Effect of mechanical stress on defect equilibrium of nonstoichiometric oxides

机械应力对非化学计量氧化物缺陷平衡的影响

• 批准号: 24656375
• 负责人: KAWADA Tatsuya
• 金额: $ 2.66万
• 依托单位: Tohoku University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Challenging Exploratory Research
• 财政年份: 2012
• 资助国家: 日本
• 起止时间: 2012-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-24656375/
• 关键词: 酸素不定比性; 応力; 欠陥平衡; 酸素センサ; ペロブスカイト型酸化物; 不定比性酸化物; 酸素空孔; 格子間酸素; 起電力; 酸素ポテンシャル

This research aimed at experimental quantification of the effect of mechanical stress on the defect equilibrium of oxide materials, (La,Sr)CoO3, (La,Sr)(Co,Fe)O3, (La,Sr)FeO3, La2NiO4, nd LaMnO3 were selected as the model materials. A YSZ ball was indented onto the sample surfaces and the potential between the electrodes placed on YSZ and on the sample were measured as a function of time. With the materials with oxygen deficient nonstoichiometry, the potential showed sudden decrease upon loading, and increased upon its release. During the load was kept constant, the potential decayed to the original value with a time constant equivalent to that of oxygen vacancy diffusion. The effect of the stress on the chemical potential was quantified from the emf shift. It was consistent with the thermodynamic calculation based on the chemical expansion coefficient of the corresponding materials.

本研究以（La，Sr）CoO_3、（La，Sr）（Co，Fe）O_3、（La，Sr）FeO_3、La_2NiO_4和LaMnO_3为模型材料，通过实验定量研究了机械应力对氧化物材料缺陷平衡的影响。将YSZ球压入样品表面上，并测量放置在YSZ上和样品上的电极之间的电势作为时间的函数。对于缺氧非化学计量比的材料，其电位在加载时突然降低，在释放时增加。 在负载不变的情况下，电位以氧空位扩散的时间常数衰减到初始值。应力对化学势的影响从电动势位移中量化。这与基于相应材料的化学膨胀系数的热力学计算结果一致。

项目成果

機械的応力による金属酸化物の電気化学特性への影響

机械应力对金属氧化物电化学性能的影响

• 发表时间: 2013
• 作者: 五井友基;八代圭司;渡辺智;川田達也;橋本真一
• 通讯作者: 橋本真一

Transient shift of local oxygen potential in nonstoichiometric oxides upon application of mechanical stress

施加机械应力时非化学计量氧化物中局部氧势的瞬态变化

• DOI: 10.1007/s10832-013-9885-x
• 发表时间: 2014
• 期刊: J. Electroceramics
• 作者: Tatsuya Kawada;Tomohisa Masumitsu. Yuta Kimura;Satoshi Watanabe;Shin-ichi Hashimoto;Keiji Yashiro;Koji Amezawa
• 通讯作者: Koji Amezawa

Experimental Evaluation of Oxygen Nonstoichiometry under a Mechanical Stress

机械应力下氧非化学计量的实验评估

• 发表时间: 2013
• 作者: Tatsuya Kawada;Yuki Gonoi;Yuta Kimura;Tomohisa Masumitsu;Keiji Yashiro;Shin-ichi Hashimoto;Koji Amezawa
• 通讯作者: Koji Amezawa

Influence of mechanical stress on oxygen potential in nonstoichiometric oxides

机械应力对非化学计量氧化物中氧势的影响

• 发表时间: 2012
• 作者: T. Masumitsu;S. Watanabe;S. Hashimoto;K. Amezawa;T. Kawada
• 通讯作者: T. Kawada

Compositional and Mechanical Stabilities of a (La,Sr)(Co,Fe)O^<3-δ> Cathode under SOFC Operation

SOFC 运行下 (La,Sr)(Co,Fe)O^<3-δ> 阴极的成分和机械稳定性

• 发表时间: 2012
• 期刊: Electrochem. Soc. Trans
• 作者: Tatsuya Kawada;Mi Young Oh;Hidetaka Watanabe;Yuta Kimura;Yoshinobu Fujimaki;Tomohisa Masumitsu;Satoshi Watanabe;Shinichi Hashimoto;Koji Amezawa
• 通讯作者: Koji Amezawa