Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1-xSrxCoO3-δ (Ln = La, Pr and Nd; X > 0.60)

M. James; T. Tedesco; D. J. Cassidy; R. L. Withers

doi:10.1016/j.materresbull.2005.02.020

Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln_1-xSr_xCoO_3-δ (Ln = La, Pr and Nd; X > 0.60)

M. James^*, T. Tedesco, D. J. Cassidy, R. L. Withers

^*Corresponding author for this work

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

42 Citations (Scopus)

Abstract

A family of Sr-doped perovskite compounds Ln_1-xSr _xCoO_3-δ (Ln = La³⁺, Pr³⁺ and Nd³⁺; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm³⁺ and an upper limit of Sr²⁺ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln³⁺/Sr²⁺ cation ordering was observed.

Original language	English
Pages (from-to)	990-1000
Number of pages	11
Journal	Materials Research Bulletin
Volume	40
Issue number	6
DOIs	https://doi.org/10.1016/j.materresbull.2005.02.020
Publication status	Published - 15 Jun 2005

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10.1016/j.materresbull.2005.02.020

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title = "Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1-xSrxCoO3-δ (Ln = La, Pr and Nd; X > 0.60)",

abstract = "A family of Sr-doped perovskite compounds Ln1-xSr xCoO3-δ (Ln = La3+, Pr3+ and Nd3+; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm3+ and an upper limit of Sr2+ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln3+/Sr2+ cation ordering was observed.",

keywords = "A. Oxides, C. Electron diffraction, C. Thermogravimetric analysis (TGA), D. Crystal structure",

author = "M. James and T. Tedesco and Cassidy, {D. J.} and Withers, {R. L.}",

year = "2005",

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doi = "10.1016/j.materresbull.2005.02.020",

language = "English",

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journal = "Materials Research Bulletin",

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T1 - Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln1-xSrxCoO3-δ (Ln = La, Pr and Nd; X > 0.60)

AU - James, M.

AU - Tedesco, T.

AU - Cassidy, D. J.

AU - Withers, R. L.

PY - 2005/6/15

Y1 - 2005/6/15

N2 - A family of Sr-doped perovskite compounds Ln1-xSr xCoO3-δ (Ln = La3+, Pr3+ and Nd3+; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm3+ and an upper limit of Sr2+ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln3+/Sr2+ cation ordering was observed.

AB - A family of Sr-doped perovskite compounds Ln1-xSr xCoO3-δ (Ln = La3+, Pr3+ and Nd3+; x > 0.60), were prepared by sol-gel chemistry and reaction at 1100 °C under 1 atm of oxygen. This structural family has been shown to be present only for rare earth ions larger than Sm3+ and an upper limit of Sr2+ solubility in these phases was found to exist between x = 0.90 and 0.95. X-ray diffraction shows oxygen-deficient, simple cubic (Pm-3m) perovskite crystal structures. The combination of electron and powder neutron diffraction reveals that oxygen vacancy ordering occurs, leading to a tetragonal (P4/mmm) superstructure and a doubling of the basic perovskite unit along the crystallographic c-axis. No additional Ln3+/Sr2+ cation ordering was observed.

KW - A. Oxides

KW - C. Electron diffraction

KW - C. Thermogravimetric analysis (TGA)

KW - D. Crystal structure

UR - http://www.scopus.com/inward/record.url?scp=18844371781&partnerID=8YFLogxK

U2 - 10.1016/j.materresbull.2005.02.020

DO - 10.1016/j.materresbull.2005.02.020

M3 - Article

SN - 0025-5408

VL - 40

SP - 990

EP - 1000

JO - Materials Research Bulletin

JF - Materials Research Bulletin

IS - 6

ER -

Oxygen vacancy ordering in strontium doped rare earth cobaltate perovskites Ln_1-xSr_xCoO_3-δ (Ln = La, Pr and Nd; X > 0.60)

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