Ordered Mesoporous Fe2O3 With Crystalline Walls

J Feng; A Harrison; J C Jumas; W Kockelmann; A V Chadwick; Peter George Bruce

doi:10.1021/ja0584774

Ordered Mesoporous Fe₂O₃ With Crystalline Walls

J Feng, A Harrison, J C Jumas, W Kockelmann, A V Chadwick, Peter George Bruce

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

Abstract

alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.

Original language	English
Pages (from-to)	5468-5474
Number of pages	7
Journal	Journal of the American Chemical Society
Volume	128
Issue number	39
DOIs	https://doi.org/10.1021/ja0584774
Publication status	Published - 26 Apr 2006

Keywords

HEMATITE NANOPARTICLES
MAGNETIC-PROPERTIES
MORIN TRANSITION
MOLECULAR-SIEVES
METAL-OXIDES
IRON-OXIDE
TEMPERATURE
ALPHA-FE2O3
PARTICLES
MOSSBAUER

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10.1021/ja0584774

Cite this

@article{95180fd0d55e42e1a9661134f7ad6a48,

title = "Ordered Mesoporous Fe2O3 With Crystalline Walls",

abstract = "alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.",

keywords = "HEMATITE NANOPARTICLES, MAGNETIC-PROPERTIES, MORIN TRANSITION, MOLECULAR-SIEVES, METAL-OXIDES, IRON-OXIDE, TEMPERATURE, ALPHA-FE2O3, PARTICLES, MOSSBAUER",

author = "J Feng and A Harrison and Jumas, {J C} and W Kockelmann and Chadwick, {A V} and Bruce, {Peter George}",

year = "2006",

month = apr,

day = "26",

doi = "10.1021/ja0584774",

language = "English",

volume = "128",

pages = "5468--5474",

journal = "Journal of the American Chemical Society",

issn = "0002-7863",

publisher = "American Chemical Society (ACS)",

number = "39",

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TY - JOUR

T1 - Ordered Mesoporous Fe2O3 With Crystalline Walls

AU - Feng, J

AU - Harrison, A

AU - Jumas, J C

AU - Kockelmann, W

AU - Chadwick, A V

AU - Bruce, Peter George

PY - 2006/4/26

Y1 - 2006/4/26

N2 - alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.

AB - alpha-Fe2O3 has been synthesized with an ordered mesoporous structure and crystalline walls that exhibit a near-single crystal-like order. The unique magnetic behavior of the material, distinct from bulk nanoparticles of alpha-Fe2O3 or mesoporous Fe2O3 with disordered walls, has been established. Magnetic susceptibility, Mossbauer, and neutron diffraction data show that the material possesses the same long-range magnetic order as bulk alpha-Fe2O3, despite the wall thickness being less than the 8 nm limit below which magnetic ordering breaks down in nanciparticulate alpha-Fe2O3, yet the Morin transition of bulk alpha-Fe2O3 is absent. It is also shown by TEM, PXRD, and EXAFS that alpha-Fe2O3 with the same ordered mesoporous structure but disordered walls contains small crystalline domains. Mossbauer and magnetic susceptibility data demonstrate that this material exhibits no long-range magnetic order but superparamagnetic behavior.

KW - HEMATITE NANOPARTICLES

KW - MAGNETIC-PROPERTIES

KW - MORIN TRANSITION

KW - MOLECULAR-SIEVES

KW - METAL-OXIDES

KW - IRON-OXIDE

KW - TEMPERATURE

KW - ALPHA-FE2O3

KW - PARTICLES

KW - MOSSBAUER

UR - http://www.scopus.com/inward/record.url?scp=33646452148&partnerID=8YFLogxK

U2 - 10.1021/ja0584774

DO - 10.1021/ja0584774

M3 - Article

SN - 0002-7863

VL - 128

SP - 5468

EP - 5474

JO - Journal of the American Chemical Society

JF - Journal of the American Chemical Society

IS - 39

ER -

Ordered Mesoporous Fe₂O₃ With Crystalline Walls

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Keywords

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EPSRC GR/T08890/01: Intercalation Compounds and Polymer Electrolytes for lithium batteries

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Ordered Mesoporous Fe2O3 With Crystalline Walls

Abstract

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EPSRC GR/T08890/01: Intercalation Compounds and Polymer Electrolytes for lithium batteries

Cite this

Ordered Mesoporous Fe₂O₃ With Crystalline Walls