The Structure of the Oxide Ion Conductor La0.9Ga0.1Mg0.2O2.85 by powder neutron diffraction

PR Slater; John Thomas Sirr Irvine; T Ishihara; Y Takita

The Structure of the Oxide Ion Conductor La_0.9Ga_0.1Mg_0.2O_2.85 by powder neutron diffraction

PR Slater, John Thomas Sirr Irvine, T Ishihara, Y Takita

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

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 La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(2.85)are shown to be preferentially located in the apical sites. (C) 1998 Elsevier Science B.V. All rights reserved.

Original language	English
Pages (from-to)	319-
Number of pages	5
Journal	Solid State Ionics
Volume	107
Publication status	Published - Apr 1998

Keywords

oxide ion conductivity
perovskite
solid oxide fuel cell
neutron diffraction
LA

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title = "The Structure of the Oxide Ion Conductor La0.9Ga0.1Mg0.2O2.85 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 La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(2.85)are shown to be preferentially located in the apical sites. (C) 1998 Elsevier Science B.V. All rights reserved.",

keywords = "oxide ion conductivity, perovskite, solid oxide fuel cell, neutron diffraction, LA",

author = "PR Slater and Irvine, {John Thomas Sirr} and T Ishihara and Y Takita",

year = "1998",

month = apr,

language = "English",

volume = "107",

pages = "319--",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier",

}

TY - JOUR

T1 - The Structure of the Oxide Ion Conductor La0.9Ga0.1Mg0.2O2.85 by powder neutron diffraction

AU - Slater, PR

AU - Irvine, John Thomas Sirr

AU - Ishihara, T

AU - Takita, Y

PY - 1998/4

Y1 - 1998/4

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 La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(2.85)are shown to be preferentially located in the apical sites. (C) 1998 Elsevier Science B.V. All rights reserved.

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 La(0.9)Sr(0.1)Ga(0.8)Mg(0.2)O(2.85)are shown to be preferentially located in the apical sites. (C) 1998 Elsevier Science B.V. All rights reserved.

KW - oxide ion conductivity

KW - perovskite

KW - solid oxide fuel cell

KW - neutron diffraction

KW - LA

UR - http://www.scopus.com/inward/record.url?scp=0032048151&partnerID=8YFLogxK

M3 - Article

SN - 0167-2738

VL - 107

SP - 319-

JO - Solid State Ionics

JF - Solid State Ionics

ER -

The Structure of the Oxide Ion Conductor La_0.9Ga_0.1Mg_0.2O_2.85 by powder neutron diffraction

Abstract

Keywords

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