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

doi:10.1149/07801.0613ecst

Preparation of structural phase diagram of Ln₂Ni_1-xCu_xO_4+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 proceeding › Conference contribution

2 Citations (Scopus)

Abstract

Crystal structure of Ln₂Ni_1-xCu_xO_4+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 La₂Ni_1-xCu_xO_4+δ regardless of Cu content. Single phase with Nd₂CuO₄ structure, so-called T'-phase, was obtained for Sm₂Ni_1-xCu_xO_4+δ and Eu₂Ni_1-xCu_xO_4+δ for only 0.95≤x≤1.0 and x=1.0 respectively. No T-phase was obtained for the other composition of Ln₂Ni_1-xCu_xO_4+δ (Ln=Sm, Eu). The single T-phase and T'-phase were obtained for Pr₂Ni_1-xCu_xO_4+δ with x≤0.4 and x=1.0, respectively. For Pr₂Ni_1-xCu_xO_4+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 Nd₂Ni_1-xCu_xO_4+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-xCuxO_4+δ remained up to 700°C. Variation of the crystal structure of Ln₂Ni_1-xCu_xO_4+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 language	English
Title of host publication	ECS Transactions
Editors	S. C. Singhal, T. Kawada
Publisher	Electrochemical Society Inc.
Pages	613-622
Number of pages	10
Edition	1
ISBN (Electronic)	9781607688150, 9781607688150
DOIs	https://doi.org/10.1149/07801.0613ecst
Publication status	Published - May 30 2017
Externally published	Yes
Event	15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017 - Hollywood, United States Duration: Jul 23 2017 → Jul 28 2017

Publication series

Name	ECS Transactions
Number	1
Volume	78
ISSN (Print)	1938-6737
ISSN (Electronic)	1938-5862

Other

Other	15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017
Country/Territory	United States
City	Hollywood
Period	7/23/17 → 7/28/17

All Science Journal Classification (ASJC) codes

Engineering(all)

Access to Document

10.1149/07801.0613ecst

Cite this

Soga, H., Wang, C. K., Hayashi, T., Morise, T., Niwa, E., & Hashimoto, T. (2017). Preparation of structural phase diagram of Ln₂Ni_1-xCu_xO_4+δ (Ln=La, Pr, Nd, Sm, Eu) as new cathode materials: Variation of structural phase diagram on kind of Ln. In S. C. Singhal, & T. Kawada (Eds.), ECS Transactions (1 ed., pp. 613-622). (ECS Transactions; Vol. 78, No. 1). Electrochemical Society Inc.. https://doi.org/10.1149/07801.0613ecst

Preparation of structural phase diagram of Ln₂Ni_1-xCu_xO_4+δ (Ln=La, Pr, Nd, Sm, Eu) as new cathode materials: Variation of structural phase diagram on kind of Ln. / Soga, H.; Wang, C. K.; Hayashi, T. et al.
ECS Transactions. ed. / S. C. Singhal; T. Kawada. 1. ed. Electrochemical Society Inc., 2017. p. 613-622 (ECS Transactions; Vol. 78, No. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Soga, H, Wang, CK, Hayashi, T, Morise, T, Niwa, E & Hashimoto, T 2017, Preparation of structural phase diagram of Ln₂Ni_1-xCu_xO_4+δ (Ln=La, Pr, Nd, Sm, Eu) as new cathode materials: Variation of structural phase diagram on kind of Ln. in SC Singhal & T Kawada (eds), ECS Transactions. 1 edn, ECS Transactions, no. 1, vol. 78, Electrochemical Society Inc., pp. 613-622, 15th International Symposium on Solid Oxide Fuel Cells, SOFC 2017, Hollywood, United States, 7/23/17. https://doi.org/10.1149/07801.0613ecst

Soga H, Wang CK, Hayashi T, Morise T, Niwa E, Hashimoto T. Preparation of structural phase diagram of Ln₂Ni_1-xCu_xO_4+δ (Ln=La, Pr, Nd, Sm, Eu) as new cathode materials: Variation of structural phase diagram on kind of Ln. In Singhal SC, Kawada T, editors, ECS Transactions. 1 ed. Electrochemical Society Inc. 2017. p. 613-622. (ECS Transactions; 1). doi: 10.1149/07801.0613ecst

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title = "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",

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+.",

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N2 - 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+.

AB - 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+.

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