Atomic ordering in the doped rare earth cobaltates Ln0.33Sr0.67CoO3-δ (Ln = Y3+, Ho3+ and Dy3+)

R. L. Withers; M. James; D. J. Goossens

doi:10.1016/S0022-4596(03)00227-5

Atomic ordering in the doped rare earth cobaltates Ln_0.33Sr_0.67CoO_3-δ (Ln = Y³⁺, Ho³⁺ and Dy³⁺)

R. L. Withers^*, M. James, D. J. Goossens

^*Corresponding author for this work

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

90 Citations (Scopus)

Abstract

The perovskite-based rare earth cobaltates (Ln_0.33Sr_0.67CoO_3-δ) (Ln=Y³⁺, Ho³⁺ and Dy³⁺) have been synthesized at 1100°C under 1atm oxygen. A thermogravimetric study has determined the overall oxygen content in each case while a combined electron diffraction (ED) and synchrotron X-ray diffraction study has revealed the presence of a complex, previously unreported, perovskite-related superstructure phase. ED gave a resultant C1c1 but most probably Cmcm (a=2a_p-2c_p, b=4b_p, c=2a_p+2c_p) perovskite-related superstructure, describable as a modulated I4/mmm intermediate parent structure. Synchrotron X-ray data has been used to refine the intermediate parent structures of all three compounds. Coupled Ln/Sr and O/vacancy ordering and associated structural relaxation is shown to be responsible for the observed superstructure.

Original language	English
Pages (from-to)	198-208
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	174
Issue number	1
DOIs	https://doi.org/10.1016/S0022-4596(03)00227-5
Publication status	Published - Aug 2003

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title = "Atomic ordering in the doped rare earth cobaltates Ln0.33Sr0.67CoO3-δ (Ln = Y3+, Ho3+ and Dy3+)",

abstract = "The perovskite-based rare earth cobaltates (Ln0.33Sr0.67CoO3-δ) (Ln=Y3+, Ho3+ and Dy3+) have been synthesized at 1100°C under 1atm oxygen. A thermogravimetric study has determined the overall oxygen content in each case while a combined electron diffraction (ED) and synchrotron X-ray diffraction study has revealed the presence of a complex, previously unreported, perovskite-related superstructure phase. ED gave a resultant C1c1 but most probably Cmcm (a=2ap-2cp, b=4bp, c=2ap+2cp) perovskite-related superstructure, describable as a modulated I4/mmm intermediate parent structure. Synchrotron X-ray data has been used to refine the intermediate parent structures of all three compounds. Coupled Ln/Sr and O/vacancy ordering and associated structural relaxation is shown to be responsible for the observed superstructure.",

keywords = "Electron diffraction, Perovskite superstructure, Strontium-doped cobaltate",

author = "Withers, {R. L.} and M. James and Goossens, {D. J.}",

year = "2003",

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doi = "10.1016/S0022-4596(03)00227-5",

language = "English",

volume = "174",

pages = "198--208",

journal = "Journal of Solid State Chemistry",

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T1 - Atomic ordering in the doped rare earth cobaltates Ln0.33Sr0.67CoO3-δ (Ln = Y3+, Ho3+ and Dy3+)

AU - Withers, R. L.

AU - James, M.

AU - Goossens, D. J.

PY - 2003/8

Y1 - 2003/8

N2 - The perovskite-based rare earth cobaltates (Ln0.33Sr0.67CoO3-δ) (Ln=Y3+, Ho3+ and Dy3+) have been synthesized at 1100°C under 1atm oxygen. A thermogravimetric study has determined the overall oxygen content in each case while a combined electron diffraction (ED) and synchrotron X-ray diffraction study has revealed the presence of a complex, previously unreported, perovskite-related superstructure phase. ED gave a resultant C1c1 but most probably Cmcm (a=2ap-2cp, b=4bp, c=2ap+2cp) perovskite-related superstructure, describable as a modulated I4/mmm intermediate parent structure. Synchrotron X-ray data has been used to refine the intermediate parent structures of all three compounds. Coupled Ln/Sr and O/vacancy ordering and associated structural relaxation is shown to be responsible for the observed superstructure.

AB - The perovskite-based rare earth cobaltates (Ln0.33Sr0.67CoO3-δ) (Ln=Y3+, Ho3+ and Dy3+) have been synthesized at 1100°C under 1atm oxygen. A thermogravimetric study has determined the overall oxygen content in each case while a combined electron diffraction (ED) and synchrotron X-ray diffraction study has revealed the presence of a complex, previously unreported, perovskite-related superstructure phase. ED gave a resultant C1c1 but most probably Cmcm (a=2ap-2cp, b=4bp, c=2ap+2cp) perovskite-related superstructure, describable as a modulated I4/mmm intermediate parent structure. Synchrotron X-ray data has been used to refine the intermediate parent structures of all three compounds. Coupled Ln/Sr and O/vacancy ordering and associated structural relaxation is shown to be responsible for the observed superstructure.

KW - Electron diffraction

KW - Perovskite superstructure

KW - Strontium-doped cobaltate

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U2 - 10.1016/S0022-4596(03)00227-5

DO - 10.1016/S0022-4596(03)00227-5

M3 - Article

SN - 0022-4596

VL - 174

SP - 198

EP - 208

JO - Journal of Solid State Chemistry

JF - Journal of Solid State Chemistry

IS - 1

ER -

Atomic ordering in the doped rare earth cobaltates Ln_0.33Sr_0.67CoO_3-δ (Ln = Y³⁺, Ho³⁺ and Dy³⁺)

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