The structure of the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O2.85 by powder neutron diffraction

P. R. Slater; J. T.S. Irvine; T. Ishihara; Y. Takita

doi:10.1016/s0167-2738(98)00006-x

The structure of the oxide ion conductor La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 by powder neutron diffraction

P. R. Slater, J. T.S. Irvine, T. Ishihara, Y. Takita

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

75 Citations (Scopus)

Abstract

High resolution powder neutron diffraction has shown that the room temperature structure of the new fast oxide ion conducting solid electrolyte La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 is monoclinic, rather than orthorhombic, as for the undoped parent phase LaGaO₃. In both systems the main distortion of the structure from the ideal perovskite is the tilting of the GaO₆ octahedra, and the symmetry change has a direct effect on this tilting, such that for LaGaO₃ the [001]_p tilt is in-phase when successive octahedra are considered, while for La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 it is antiphase. The degree of tilting of the octahedra is also reduced by the doping. For this room temperature data, the oxygen vacancies in La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 are shown to be preferentially located in the apical sites.

Original language	English
Pages (from-to)	319-323
Number of pages	5
Journal	Solid State Ionics
Volume	107
Issue number	3-4
DOIs	https://doi.org/10.1016/s0167-2738(98)00006-x
Publication status	Published - Apr 1 1998
Externally published	Yes

All Science Journal Classification (ASJC) codes

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

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10.1016/s0167-2738(98)00006-x

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@article{11e82ebf3eea4882b7b244332dcf01dc,

title = "The structure of the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O2.85 by powder neutron diffraction",

abstract = "High resolution powder neutron diffraction has shown that the room temperature structure of the new fast oxide ion conducting solid electrolyte La0.9Sr0.1Ga0.8Mg0.2O2.85 is monoclinic, rather than orthorhombic, as for the undoped parent phase LaGaO3. In both systems the main distortion of the structure from the ideal perovskite is the tilting of the GaO6 octahedra, and the symmetry change has a direct effect on this tilting, such that for LaGaO3 the [001]p tilt is in-phase when successive octahedra are considered, while for La0.9Sr0.1Ga0.8Mg0.2O2.85 it is antiphase. The degree of tilting of the octahedra is also reduced by the doping. For this room temperature data, the oxygen vacancies in La0.9Sr0.1Ga0.8Mg0.2O2.85 are shown to be preferentially located in the apical sites.",

author = "Slater, {P. R.} and Irvine, {J. T.S.} and T. Ishihara and Y. Takita",

note = "Funding Information: We would like to thank EPSRC and the Nuffield Foundation for financial support. We would also like to thank K.S. Knight (Rutherford Appleton Laboratory) for help with the collection of the powder neutron diffraction data on the HRPD station at ISIS.",

year = "1998",

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doi = "10.1016/s0167-2738(98)00006-x",

language = "English",

volume = "107",

pages = "319--323",

journal = "Solid State Ionics",

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T1 - The structure of the oxide ion conductor La0.9Sr0.1Ga0.8Mg0.2O2.85 by powder neutron diffraction

AU - Slater, P. R.

AU - Irvine, J. T.S.

AU - Ishihara, T.

AU - Takita, Y.

N1 - Funding Information: We would like to thank EPSRC and the Nuffield Foundation for financial support. We would also like to thank K.S. Knight (Rutherford Appleton Laboratory) for help with the collection of the powder neutron diffraction data on the HRPD station at ISIS.

PY - 1998/4/1

Y1 - 1998/4/1

N2 - High resolution powder neutron diffraction has shown that the room temperature structure of the new fast oxide ion conducting solid electrolyte La0.9Sr0.1Ga0.8Mg0.2O2.85 is monoclinic, rather than orthorhombic, as for the undoped parent phase LaGaO3. In both systems the main distortion of the structure from the ideal perovskite is the tilting of the GaO6 octahedra, and the symmetry change has a direct effect on this tilting, such that for LaGaO3 the [001]p tilt is in-phase when successive octahedra are considered, while for La0.9Sr0.1Ga0.8Mg0.2O2.85 it is antiphase. The degree of tilting of the octahedra is also reduced by the doping. For this room temperature data, the oxygen vacancies in La0.9Sr0.1Ga0.8Mg0.2O2.85 are shown to be preferentially located in the apical sites.

AB - High resolution powder neutron diffraction has shown that the room temperature structure of the new fast oxide ion conducting solid electrolyte La0.9Sr0.1Ga0.8Mg0.2O2.85 is monoclinic, rather than orthorhombic, as for the undoped parent phase LaGaO3. In both systems the main distortion of the structure from the ideal perovskite is the tilting of the GaO6 octahedra, and the symmetry change has a direct effect on this tilting, such that for LaGaO3 the [001]p tilt is in-phase when successive octahedra are considered, while for La0.9Sr0.1Ga0.8Mg0.2O2.85 it is antiphase. The degree of tilting of the octahedra is also reduced by the doping. For this room temperature data, the oxygen vacancies in La0.9Sr0.1Ga0.8Mg0.2O2.85 are shown to be preferentially located in the apical sites.

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The structure of the oxide ion conductor La_0.9Sr_0.1Ga_0.8Mg_0.2O_2.85 by powder neutron diffraction

Abstract

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