Structural and Magnetic Characterisation of La1+xSr1-xCo0.5M0.5O4 +/-delta (M = Cr, Mn)

H El Shinawi; Colin Greaves

doi:10.1002/zaac.200900202

Structural and Magnetic Characterisation of La1+xSr1-xCo0.5M0.5O4 +/-delta (M = Cr, Mn)

H El Shinawi, Colin Greaves

Chemistry

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6 Citations (Scopus)

Abstract

The K2NiF4 phases La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.15) and La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.2) have been synthesised and examined by X-ray powder diffraction, thermal analysis, neutron powder diffraction and magnetic susceptibility measurements. Mn3+/Co3+ and Cr3+/Co3+ states predominate in the oxidised forms. Structural stability and crystal symmetry are retained under reducing conditions which cause reduction of Co3+ into Co2+ and the creation of oxide ion vacancies within the equatorial planes of the K2NiF4 structure. Excess oxygen in La1.2Sr0.8Co0.5Mn0.5O4.1 is accommodated in the ideal interstitial positions (0, 0.5, 0.25) of the tetragonal structure of these materials in an oxygen/air atmosphere. No long-range magnetic order has been observed because of competing AFM and FM interactions in these B-site disordered materials.

Original language	English
Pages (from-to)	1856-1862
Number of pages	7
Journal	Zeitschrift fur Anorganische und Allgemeine Chemie
Volume	635
Issue number	12
DOIs	https://doi.org/10.1002/zaac.200900202
Publication status	Published - 1 Jan 2009

Keywords

Magnetic properties
Layered compounds
Solid state reactions
Nonstoichiometric
Neutron diffraction

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10.1002/zaac.200900202

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@article{636db3701507453b810d43aaf128c068,

title = "Structural and Magnetic Characterisation of La1+xSr1-xCo0.5M0.5O4 +/-delta (M = Cr, Mn)",

abstract = "The K2NiF4 phases La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.15) and La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.2) have been synthesised and examined by X-ray powder diffraction, thermal analysis, neutron powder diffraction and magnetic susceptibility measurements. Mn3+/Co3+ and Cr3+/Co3+ states predominate in the oxidised forms. Structural stability and crystal symmetry are retained under reducing conditions which cause reduction of Co3+ into Co2+ and the creation of oxide ion vacancies within the equatorial planes of the K2NiF4 structure. Excess oxygen in La1.2Sr0.8Co0.5Mn0.5O4.1 is accommodated in the ideal interstitial positions (0, 0.5, 0.25) of the tetragonal structure of these materials in an oxygen/air atmosphere. No long-range magnetic order has been observed because of competing AFM and FM interactions in these B-site disordered materials.",

keywords = "Magnetic properties, Layered compounds, Solid state reactions, Nonstoichiometric, Neutron diffraction",

author = "{El Shinawi}, H and Colin Greaves",

year = "2009",

month = jan,

day = "1",

doi = "10.1002/zaac.200900202",

language = "English",

volume = "635",

pages = "1856--1862",

journal = "Zeitschrift fur Anorganische und Allgemeine Chemie",

issn = "1521-3749",

publisher = "Wiley-VCH Verlag",

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}

TY - JOUR

T1 - Structural and Magnetic Characterisation of La1+xSr1-xCo0.5M0.5O4 +/-delta (M = Cr, Mn)

AU - El Shinawi, H

AU - Greaves, Colin

PY - 2009/1/1

Y1 - 2009/1/1

N2 - The K2NiF4 phases La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.15) and La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.2) have been synthesised and examined by X-ray powder diffraction, thermal analysis, neutron powder diffraction and magnetic susceptibility measurements. Mn3+/Co3+ and Cr3+/Co3+ states predominate in the oxidised forms. Structural stability and crystal symmetry are retained under reducing conditions which cause reduction of Co3+ into Co2+ and the creation of oxide ion vacancies within the equatorial planes of the K2NiF4 structure. Excess oxygen in La1.2Sr0.8Co0.5Mn0.5O4.1 is accommodated in the ideal interstitial positions (0, 0.5, 0.25) of the tetragonal structure of these materials in an oxygen/air atmosphere. No long-range magnetic order has been observed because of competing AFM and FM interactions in these B-site disordered materials.

AB - The K2NiF4 phases La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.15) and La1+xSr1-xCo0.5Cr0.5O4 +/-delta (x = 0, 0.2) have been synthesised and examined by X-ray powder diffraction, thermal analysis, neutron powder diffraction and magnetic susceptibility measurements. Mn3+/Co3+ and Cr3+/Co3+ states predominate in the oxidised forms. Structural stability and crystal symmetry are retained under reducing conditions which cause reduction of Co3+ into Co2+ and the creation of oxide ion vacancies within the equatorial planes of the K2NiF4 structure. Excess oxygen in La1.2Sr0.8Co0.5Mn0.5O4.1 is accommodated in the ideal interstitial positions (0, 0.5, 0.25) of the tetragonal structure of these materials in an oxygen/air atmosphere. No long-range magnetic order has been observed because of competing AFM and FM interactions in these B-site disordered materials.

KW - Magnetic properties

KW - Layered compounds

KW - Solid state reactions

KW - Nonstoichiometric

KW - Neutron diffraction

U2 - 10.1002/zaac.200900202

DO - 10.1002/zaac.200900202

M3 - Article

SN - 1521-3749

VL - 635

SP - 1856

EP - 1862

JO - Zeitschrift fur Anorganische und Allgemeine Chemie

JF - Zeitschrift fur Anorganische und Allgemeine Chemie

IS - 12

ER -

Structural and Magnetic Characterisation of La1+xSr1-xCo0.5M0.5O4 +/-delta (M = Cr, Mn)

Abstract

Keywords

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