Doping effect on crystal structure and conduction property of fast oxide ion conductor LaGaO3-based perovskite

Masahiro Kajitani; Motohide Matsuda; Akinori Hoshikawa; Stefanus Harjo; Takashi Kamiyama; Toru Ishigaki; Fujio Izumi; Michihiro Miyake

doi:10.1016/j.jpcs.2007.01.049

Doping effect on crystal structure and conduction property of fast oxide ion conductor LaGaO₃-based perovskite

Masahiro Kajitani, Motohide Matsuda, Akinori Hoshikawa, Stefanus Harjo, Takashi Kamiyama, Toru Ishigaki, Fujio Izumi, Michihiro Miyake

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

Abstract

In order to discuss oxide ion conduction mechanism for LaGaO₃-based perovskite compounds, doping effects were investigated using two kinds of solid solutions whose oxygen vacancy concentrations are the same: one is La_0.9Sr_0.1Ga_0.9Mg_0.1O_2.9 with A-site and B-site substitutions and the other is LaGa_0.8Mg_0.2O_2.9 with only B-site substitution. Conductivity measurements showed that La_0.9Sr_0.1Ga_0.9Mg_0.1O_2.9 had a circumstance whereby oxide ion could more easily diffuse in the perovskite structure than in LaGa_0.8Mg_0.2O_2.9. Structural analyses using neutron diffraction found out the following three differences: the first finding was that the saddle point formed by two A-site cations and one B-site cation in La_0.9Sr_0.1Ga_0.9Mg_0.1O_2.9 was larger than that in LaGa_0.8Mg_0.2O_2.9 due to larger displacements of A-site and B-site cations; the second was that the doubly doping with Sr and Mg was more effective for reduction of GaO₆ octahedral tilt angles than the doping with Mg; the last was that La_0.9Sr_0.1Ga_0.9Mg_0.1O_2.9 had larger oxygen displacement than LaGa_0.8Mg_0.2O_2.9. It was considered that these structurally related parameters dominated the high oxide ion conduction in LaGaO₃-based perovskite compounds.

Original language	English
Pages (from-to)	758-764
Number of pages	7
Journal	Journal of Physics and Chemistry of Solids
Volume	68
Issue number	5-6
DOIs	https://doi.org/10.1016/j.jpcs.2007.01.049
Publication status	Published - May 2007

Keywords

A: Ceramics
D: Electrical conductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

Access to Document

10.1016/j.jpcs.2007.01.049

Cite this

@article{ecd9ff5ae80647d9a93a75cbb6968d2b,

title = "Doping effect on crystal structure and conduction property of fast oxide ion conductor LaGaO3-based perovskite",

abstract = "In order to discuss oxide ion conduction mechanism for LaGaO3-based perovskite compounds, doping effects were investigated using two kinds of solid solutions whose oxygen vacancy concentrations are the same: one is La0.9Sr0.1Ga0.9Mg0.1O2.9 with A-site and B-site substitutions and the other is LaGa0.8Mg0.2O2.9 with only B-site substitution. Conductivity measurements showed that La0.9Sr0.1Ga0.9Mg0.1O2.9 had a circumstance whereby oxide ion could more easily diffuse in the perovskite structure than in LaGa0.8Mg0.2O2.9. Structural analyses using neutron diffraction found out the following three differences: the first finding was that the saddle point formed by two A-site cations and one B-site cation in La0.9Sr0.1Ga0.9Mg0.1O2.9 was larger than that in LaGa0.8Mg0.2O2.9 due to larger displacements of A-site and B-site cations; the second was that the doubly doping with Sr and Mg was more effective for reduction of GaO6 octahedral tilt angles than the doping with Mg; the last was that La0.9Sr0.1Ga0.9Mg0.1O2.9 had larger oxygen displacement than LaGa0.8Mg0.2O2.9. It was considered that these structurally related parameters dominated the high oxide ion conduction in LaGaO3-based perovskite compounds.",

keywords = "A: Ceramics, D: Electrical conductivity",

author = "Masahiro Kajitani and Motohide Matsuda and Akinori Hoshikawa and Stefanus Harjo and Takashi Kamiyama and Toru Ishigaki and Fujio Izumi and Michihiro Miyake",

note = "Funding Information: M. Kajitani would like to thank the Japan Society for the Promotion of Science (JSPS) for its financial support in initiating this study. This work was also funded in part by a Grant-in-Aid for Scientific Research (B) (16360331 and 17350101) from the JSPS and the Okayama University 21st Century COE Program “Strategic Solid Waste Management of Sustainable Society”. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2007",

month = may,

doi = "10.1016/j.jpcs.2007.01.049",

language = "English",

volume = "68",

pages = "758--764",

journal = "Journal of Physics and Chemistry of Solids",

issn = "0022-3697",

publisher = "Elsevier Limited",

number = "5-6",

}

TY - JOUR

T1 - Doping effect on crystal structure and conduction property of fast oxide ion conductor LaGaO3-based perovskite

AU - Kajitani, Masahiro

AU - Matsuda, Motohide

AU - Hoshikawa, Akinori

AU - Harjo, Stefanus

AU - Kamiyama, Takashi

AU - Ishigaki, Toru

AU - Izumi, Fujio

AU - Miyake, Michihiro

N1 - Funding Information: M. Kajitani would like to thank the Japan Society for the Promotion of Science (JSPS) for its financial support in initiating this study. This work was also funded in part by a Grant-in-Aid for Scientific Research (B) (16360331 and 17350101) from the JSPS and the Okayama University 21st Century COE Program “Strategic Solid Waste Management of Sustainable Society”. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2007/5

Y1 - 2007/5

N2 - In order to discuss oxide ion conduction mechanism for LaGaO3-based perovskite compounds, doping effects were investigated using two kinds of solid solutions whose oxygen vacancy concentrations are the same: one is La0.9Sr0.1Ga0.9Mg0.1O2.9 with A-site and B-site substitutions and the other is LaGa0.8Mg0.2O2.9 with only B-site substitution. Conductivity measurements showed that La0.9Sr0.1Ga0.9Mg0.1O2.9 had a circumstance whereby oxide ion could more easily diffuse in the perovskite structure than in LaGa0.8Mg0.2O2.9. Structural analyses using neutron diffraction found out the following three differences: the first finding was that the saddle point formed by two A-site cations and one B-site cation in La0.9Sr0.1Ga0.9Mg0.1O2.9 was larger than that in LaGa0.8Mg0.2O2.9 due to larger displacements of A-site and B-site cations; the second was that the doubly doping with Sr and Mg was more effective for reduction of GaO6 octahedral tilt angles than the doping with Mg; the last was that La0.9Sr0.1Ga0.9Mg0.1O2.9 had larger oxygen displacement than LaGa0.8Mg0.2O2.9. It was considered that these structurally related parameters dominated the high oxide ion conduction in LaGaO3-based perovskite compounds.

AB - In order to discuss oxide ion conduction mechanism for LaGaO3-based perovskite compounds, doping effects were investigated using two kinds of solid solutions whose oxygen vacancy concentrations are the same: one is La0.9Sr0.1Ga0.9Mg0.1O2.9 with A-site and B-site substitutions and the other is LaGa0.8Mg0.2O2.9 with only B-site substitution. Conductivity measurements showed that La0.9Sr0.1Ga0.9Mg0.1O2.9 had a circumstance whereby oxide ion could more easily diffuse in the perovskite structure than in LaGa0.8Mg0.2O2.9. Structural analyses using neutron diffraction found out the following three differences: the first finding was that the saddle point formed by two A-site cations and one B-site cation in La0.9Sr0.1Ga0.9Mg0.1O2.9 was larger than that in LaGa0.8Mg0.2O2.9 due to larger displacements of A-site and B-site cations; the second was that the doubly doping with Sr and Mg was more effective for reduction of GaO6 octahedral tilt angles than the doping with Mg; the last was that La0.9Sr0.1Ga0.9Mg0.1O2.9 had larger oxygen displacement than LaGa0.8Mg0.2O2.9. It was considered that these structurally related parameters dominated the high oxide ion conduction in LaGaO3-based perovskite compounds.

KW - A: Ceramics

KW - D: Electrical conductivity

UR - http://www.scopus.com/inward/record.url?scp=34250177624&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=34250177624&partnerID=8YFLogxK

U2 - 10.1016/j.jpcs.2007.01.049

DO - 10.1016/j.jpcs.2007.01.049

M3 - Article

AN - SCOPUS:34250177624

SN - 0022-3697

VL - 68

SP - 758

EP - 764

JO - Journal of Physics and Chemistry of Solids

JF - Journal of Physics and Chemistry of Solids

IS - 5-6

ER -