Preparation of structural phase diagram of Ln2Ni1-xCuxO4+δ (Ln=La, Pr, Nd, Sm, Eu) as new cathode materials: Variation of structural phase diagram on kind of Ln

H. Soga, C. K. Wang, T. Hayashi, T. Morise, E. Niwa, T. Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

Crystal structure of Ln2Ni1-xCuxO4+δ (Ln= La, Pr, Nd, Sm and Eu), which are expected as new cathode materials for solid fuel cells, was investigated. Single phase with K2NiF4 structure, so-called T-phase, was obtained for La2Ni1-xCuxO4+δ regardless of Cu content. Single phase with Nd2CuO4 structure, so-called T'-phase, was obtained for Sm2Ni1-xCuxO4+δ and Eu2Ni1-xCuxO4+δ for only 0.95≤x≤1.0 and x=1.0 respectively. No T-phase was obtained for the other composition of Ln2Ni1-xCuxO4+δ (Ln=Sm, Eu). The single T-phase and T'-phase were obtained for Pr2Ni1-xCuxO4+δ with x≤0.4 and x=1.0, respectively. For Pr2Ni1-xCuxO4+δ with x between 0.5 and 0.9, phase separation into T-phase and T'-phase due to miscibility gap was observed, showing similar behavior with Nd2Ni1-xCuxO4+δ except for little smaller x range of the miscibility gap. From high temperature X-ray diffraction measurements, it was revealed that the miscibility gap between 0.5 and 0.9 of Pr2Ni1-xCuxO4+δ remained up to 700°C. Variation of the crystal structure of Ln2Ni1-xCuxO4+δ on kinds of Ln and Cu content could be explained by using tolerance factor calculated from ionic radius of Ln3+, Ni2+ and Cu2+.

Original languageEnglish
Title of host publicationECS Transactions
EditorsT. Kawada, S. C. Singhal
PublisherElectrochemical Society Inc.
Pages613-622
Number of pages10
Edition1
ISBN (Electronic)9781607685395
DOIs
Publication statusPublished - May 30 2017
Externally publishedYes
Event15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States
Duration: Jul 23 2017Jul 28 2017

Publication series

NameECS Transactions
Number1
Volume78
ISSN (Print)1938-5862
ISSN (Electronic)1938-6737

Other

Other15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
CountryUnited States
CityHollywood
Period7/23/177/28/17

All Science Journal Classification (ASJC) codes

  • Engineering(all)

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