Crystallographic and magnetic studies of mesoporous eskolaite, Cr2O3

Adrian H. Hill; Andrew Harrison; Calum Dickinson; Wuzong Zhou; Winfried Kockelmann

doi:10.1016/j.micromeso.2009.11.021

Crystallographic and magnetic studies of mesoporous eskolaite, Cr2O3

Adrian H. Hill, Andrew Harrison, Calum Dickinson, Wuzong Zhou, Winfried Kockelmann

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

Abstract

Mesoporous eskolaite, Cr2O3 prepared by using the evaporation method with mesoporous KIT-6 silica as a hard template has been analysed with SQUID magnetometry and variable temperature neutron powder diffraction (NPD). NPD analysis shows that the magnetic and crystallographic properties of the eskolaite structure within the walls of the mesoporous Cr2O3 material are identical to that of "bulk" material, R (3) over barc. The refined magnetic moments on the Cr3+ ions are lower than observed for bulk material due to the higher proportion of surface atoms, creating local disorder. This is corroborated by the magnetometry results, which suggest a small amount of ferromagnetism may be present at low temperatures. (C) 2009 Elsevier Inc. All rights reserved.

Original language	English
Pages (from-to)	280-286
Number of pages	7
Journal	Microporous and Mesoporous Materials
Volume	130
Issue number	1-3
DOIs	https://doi.org/10.1016/j.micromeso.2009.11.021
Publication status	Published - May 2010

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10.1016/j.micromeso.2009.11.021

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abstract = "Mesoporous eskolaite, Cr2O3 prepared by using the evaporation method with mesoporous KIT-6 silica as a hard template has been analysed with SQUID magnetometry and variable temperature neutron powder diffraction (NPD). NPD analysis shows that the magnetic and crystallographic properties of the eskolaite structure within the walls of the mesoporous Cr2O3 material are identical to that of {"}bulk{"} material, R (3) over barc. The refined magnetic moments on the Cr3+ ions are lower than observed for bulk material due to the higher proportion of surface atoms, creating local disorder. This is corroborated by the magnetometry results, which suggest a small amount of ferromagnetism may be present at low temperatures. (C) 2009 Elsevier Inc. All rights reserved.",

author = "Hill, {Adrian H.} and Andrew Harrison and Calum Dickinson and Wuzong Zhou and Winfried Kockelmann",

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AU - Hill, Adrian H.

AU - Harrison, Andrew

AU - Dickinson, Calum

AU - Zhou, Wuzong

AU - Kockelmann, Winfried

PY - 2010/5

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N2 - Mesoporous eskolaite, Cr2O3 prepared by using the evaporation method with mesoporous KIT-6 silica as a hard template has been analysed with SQUID magnetometry and variable temperature neutron powder diffraction (NPD). NPD analysis shows that the magnetic and crystallographic properties of the eskolaite structure within the walls of the mesoporous Cr2O3 material are identical to that of "bulk" material, R (3) over barc. The refined magnetic moments on the Cr3+ ions are lower than observed for bulk material due to the higher proportion of surface atoms, creating local disorder. This is corroborated by the magnetometry results, which suggest a small amount of ferromagnetism may be present at low temperatures. (C) 2009 Elsevier Inc. All rights reserved.

AB - Mesoporous eskolaite, Cr2O3 prepared by using the evaporation method with mesoporous KIT-6 silica as a hard template has been analysed with SQUID magnetometry and variable temperature neutron powder diffraction (NPD). NPD analysis shows that the magnetic and crystallographic properties of the eskolaite structure within the walls of the mesoporous Cr2O3 material are identical to that of "bulk" material, R (3) over barc. The refined magnetic moments on the Cr3+ ions are lower than observed for bulk material due to the higher proportion of surface atoms, creating local disorder. This is corroborated by the magnetometry results, which suggest a small amount of ferromagnetism may be present at low temperatures. (C) 2009 Elsevier Inc. All rights reserved.

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DO - 10.1016/j.micromeso.2009.11.021

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Crystallographic and magnetic studies of mesoporous eskolaite, Cr2O3

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