Neutron powder diffraction and magnetic studies of mesoporous Co3O4

Adrian H. Hill; Andrew Harrison; Clemens Ritter; Wenbo Yue; Wuzong Zhou

doi:10.1016/j.jmmm.2010.09.006

Neutron powder diffraction and magnetic studies of mesoporous Co3O4

Adrian H. Hill, Andrew Harrison, Clemens Ritter, Wenbo Yue, Wuzong Zhou

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

Abstract

Samples of mesoporous Co3O4, created by using mesoporous silicas KIT-6 and SBA-16 as hard templates to control the growth of Co3O4 have been investigated with SQUID magnetometry and neutron powder diffraction, to reveal the effects of high surface area on the magnetic and electronic properties. DC magnetic susceptibility measurements show lower Neel ordering temperatures and lower magnetic moments than in a "bulk" reference. A lower second transition temperature is also observed in the mesoporous samples, associated with the freezing of the surface (shell) magnetic moments. Measurements taken with increasing applied field at constant temperature show the materials to be antiferromagnetic as expected. Complementary parametric neutron powder diffraction studies show similar trends between the two mesoporous samples when looking at their Neel temperatures, and verify long range order within the samples. (C) 2010 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	226-231
Number of pages	6
Journal	Journal of Magnetism and Magnetic Materials
Volume	323
Issue number	2
DOIs	https://doi.org/10.1016/j.jmmm.2010.09.006
Publication status	Published - Jan 2011

Keywords

Mesoporous
Neutron diffraction
Magnetic property
Co3O4
CRYSTALLINE WALLS
METAL-OXIDES
SILICA
NANOWIRES
C03O4
SIZE

Access to Document

10.1016/j.jmmm.2010.09.006

EP/F019580/1 - Electron Microscopy: Electron Microscopy of Advanced Materials
Zhou, W. (PI), Irvine, J. T. S. (CoI) & Miller, A. (CoI)
EPSRC
1/10/07 → 31/03/12
Project: Standard

Cite this

@article{ba95aace69bd4f2385970dcd8cb07ef5,

title = "Neutron powder diffraction and magnetic studies of mesoporous Co3O4",

abstract = "Samples of mesoporous Co3O4, created by using mesoporous silicas KIT-6 and SBA-16 as hard templates to control the growth of Co3O4 have been investigated with SQUID magnetometry and neutron powder diffraction, to reveal the effects of high surface area on the magnetic and electronic properties. DC magnetic susceptibility measurements show lower Neel ordering temperatures and lower magnetic moments than in a {"}bulk{"} reference. A lower second transition temperature is also observed in the mesoporous samples, associated with the freezing of the surface (shell) magnetic moments. Measurements taken with increasing applied field at constant temperature show the materials to be antiferromagnetic as expected. Complementary parametric neutron powder diffraction studies show similar trends between the two mesoporous samples when looking at their Neel temperatures, and verify long range order within the samples. (C) 2010 Elsevier B.V. All rights reserved.",

keywords = "Mesoporous, Neutron diffraction, Magnetic property, Co3O4, CRYSTALLINE WALLS, METAL-OXIDES, SILICA, NANOWIRES, C03O4, SIZE",

author = "Hill, {Adrian H.} and Andrew Harrison and Clemens Ritter and Wenbo Yue and Wuzong Zhou",

year = "2011",

month = jan,

doi = "10.1016/j.jmmm.2010.09.006",

language = "English",

volume = "323",

pages = "226--231",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "2",

}

TY - JOUR

T1 - Neutron powder diffraction and magnetic studies of mesoporous Co3O4

AU - Hill, Adrian H.

AU - Harrison, Andrew

AU - Ritter, Clemens

AU - Yue, Wenbo

AU - Zhou, Wuzong

PY - 2011/1

Y1 - 2011/1

N2 - Samples of mesoporous Co3O4, created by using mesoporous silicas KIT-6 and SBA-16 as hard templates to control the growth of Co3O4 have been investigated with SQUID magnetometry and neutron powder diffraction, to reveal the effects of high surface area on the magnetic and electronic properties. DC magnetic susceptibility measurements show lower Neel ordering temperatures and lower magnetic moments than in a "bulk" reference. A lower second transition temperature is also observed in the mesoporous samples, associated with the freezing of the surface (shell) magnetic moments. Measurements taken with increasing applied field at constant temperature show the materials to be antiferromagnetic as expected. Complementary parametric neutron powder diffraction studies show similar trends between the two mesoporous samples when looking at their Neel temperatures, and verify long range order within the samples. (C) 2010 Elsevier B.V. All rights reserved.

AB - Samples of mesoporous Co3O4, created by using mesoporous silicas KIT-6 and SBA-16 as hard templates to control the growth of Co3O4 have been investigated with SQUID magnetometry and neutron powder diffraction, to reveal the effects of high surface area on the magnetic and electronic properties. DC magnetic susceptibility measurements show lower Neel ordering temperatures and lower magnetic moments than in a "bulk" reference. A lower second transition temperature is also observed in the mesoporous samples, associated with the freezing of the surface (shell) magnetic moments. Measurements taken with increasing applied field at constant temperature show the materials to be antiferromagnetic as expected. Complementary parametric neutron powder diffraction studies show similar trends between the two mesoporous samples when looking at their Neel temperatures, and verify long range order within the samples. (C) 2010 Elsevier B.V. All rights reserved.

KW - Mesoporous

KW - Neutron diffraction

KW - Magnetic property

KW - Co3O4

KW - CRYSTALLINE WALLS

KW - METAL-OXIDES

KW - SILICA

KW - NANOWIRES

KW - C03O4

KW - SIZE

U2 - 10.1016/j.jmmm.2010.09.006

DO - 10.1016/j.jmmm.2010.09.006

M3 - Article

SN - 0304-8853

VL - 323

SP - 226

EP - 231

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 2

ER -

Neutron powder diffraction and magnetic studies of mesoporous Co3O4

Abstract

Keywords

Access to Document

Fingerprint

Projects

EP/F019580/1 - Electron Microscopy: Electron Microscopy of Advanced Materials

Cite this