TY - JOUR
T1 - Crystal structure and electrical conductivity of BaR2ZnO5 (R = Sm, Gd, Dy, Ho, and Er)®a new structure family of oxide-ion conductors
AU - Nakamura, Keigo
AU - Fujii, Kotaro
AU - Niwa, Eiki
AU - Yashima, Masatomo
N1 - Funding Information:
The authors thank Dr. S. Kawaguchi, Dr. K. Osaka, Prof. T. Ishigaki and Prof. A. Hoshikawa for their assistance with synchrotron X-ray and neutron diffraction experiments. Synchrotron experiments were carried out on beamlines BL19B2 (2015B1596) and BL02B2 (2016B1616) at SPring-8. Neutron diffraction measurements were performed with approval (2015A0249). We thank Daiichi Kigenso Kagaku Kogyo Co. and the Ookayama Materials Analysis Division, Technical Department of Tokyo Institute of Technology for ICP-AES measurements. This study was supported in part by a Grant-in-Aid for Scientific Research (KAKENHI, Nos. JP15H02291, JP26870190, JP16H00884, JP16H06293, JP16H06440, JP16H06438, JP16K21724, JP17K17717, JP17H06222) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport).
Funding Information:
Acknowledgments The authors thank Dr. S. Kawaguchi, Dr. K. Osaka, Prof. T. Ishigaki and Prof. A. Hoshikawa for their assistance with synchrotron X-ray and neutron diffraction experiments. Synchrotron experiments were carried out on beamlines BL19B2 (2015B1596) and BL02B2 (2016B1616) at SPring-8. Neutron diffraction measurements were performed with approval (2015A0249). We thank Daiichi Kigenso Kagaku Kogyo Co. and the Ookayama Materials Analysis Division, Technical Department of Tokyo Institute of Technology for ICP-AES measurements. This study was supported in part by a Grant-in-Aid for Scientific Research (KAKENHI, Nos. JP15H02291, JP26870190, JP16H00884, JP16H06293, JP16H06440, JP16H06438, JP16K21724, JP17K17717, JP17H06222) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and JSPS Core-to-Core Program, A. Advanced Research Networks (Solid Oxide Interfaces for Faster Ion Transport).
Publisher Copyright:
© 2018 The Ceramic Society of Japan. All rights reserved.
PY - 2018/5
Y1 - 2018/5
N2 - Metal oxides containing the divalent zinc cation (Zn2+, d10 electronic configuration) as an essential element are promising candidates for oxide-ion conductors, because there are several good oxide-ion conductors containing other d10 cations, such as Ga3+ and Ge4+. In the present study, we have found a new structure family of oxide-ion conductors, BaY2CuO5-type (BaCuY2O5-type) BaR2ZnO5 compounds (R = rare earths). BaR2ZnO5 compounds with a BaY2CuO5-type structure were found to be good candidates for oxide-ion conductors by the bond-valence method. BaR2ZnO5 compounds (R = Sm, Gd, Dy, Er, and Ho) were synthesized by solid-state reactions, and their electrical conductivities and crystal structures were investigated. Rietveld analyses of BaR2ZnO5 (R = Sm, Gd, Dy, Er, and Ho) using synchrotron X-ray powder diffraction data gave good fitting for the BaY2CuO5-type structure. BaHo2ZnO5 had the highest total electrical conductivity in air among BaR2ZnO5 compounds (R = Sm, Gd, Dy, Er, Ho). Oxide-ion conduction was confirmed for BaHo2ZnO5 by electrical conductivity measurements conducted under various oxygen partial pressures. Neutron powder diffraction data of BaHo2ZnO5 were analyzed by the Rietveld method, and the oxide-ion conduction paths were investigated by the bond-valence method.
AB - Metal oxides containing the divalent zinc cation (Zn2+, d10 electronic configuration) as an essential element are promising candidates for oxide-ion conductors, because there are several good oxide-ion conductors containing other d10 cations, such as Ga3+ and Ge4+. In the present study, we have found a new structure family of oxide-ion conductors, BaY2CuO5-type (BaCuY2O5-type) BaR2ZnO5 compounds (R = rare earths). BaR2ZnO5 compounds with a BaY2CuO5-type structure were found to be good candidates for oxide-ion conductors by the bond-valence method. BaR2ZnO5 compounds (R = Sm, Gd, Dy, Er, and Ho) were synthesized by solid-state reactions, and their electrical conductivities and crystal structures were investigated. Rietveld analyses of BaR2ZnO5 (R = Sm, Gd, Dy, Er, and Ho) using synchrotron X-ray powder diffraction data gave good fitting for the BaY2CuO5-type structure. BaHo2ZnO5 had the highest total electrical conductivity in air among BaR2ZnO5 compounds (R = Sm, Gd, Dy, Er, Ho). Oxide-ion conduction was confirmed for BaHo2ZnO5 by electrical conductivity measurements conducted under various oxygen partial pressures. Neutron powder diffraction data of BaHo2ZnO5 were analyzed by the Rietveld method, and the oxide-ion conduction paths were investigated by the bond-valence method.
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U2 - 10.2109/jcersj2.17252
DO - 10.2109/jcersj2.17252
M3 - Article
AN - SCOPUS:85046354701
SN - 1882-0743
VL - 126
SP - 292
EP - 299
JO - Journal of the Ceramic Society of Japan
JF - Journal of the Ceramic Society of Japan
IS - 5
ER -