Cr-doped TiO{sub 2} (rutile): Ferromagnetism in bulk form?

Journal Article · Fri Oct 15 04:00:00 EDT 2010 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.3490997· OSTI ID:21476520

Koohpayeh, S M; Williams, A J; Abell, J S ^[1]; Lim, J; Blackburn, E ^[2]

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1. Department of Metallurgy and Materials, University of Birmingham, Birmingham B15 2TT (United Kingdom)
2. School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT (United Kingdom)

Cr-doped rutile samples in powder and single crystal form have been prepared and studied with particular emphasis on their compositional, structural, and magnetic properties. Both powders and single crystals were characterized using x-ray diffractometry and vibrating sample magnetometry, while crystals were also studied using the x-ray Laue technique, scanning electron microscopy, and energy dispersive x-ray analysis. The results indicate weak ferromagnetic behavior at room temperature (RT) in Cr-doped TiO{sub 2} powders having 2 at. % Cr, while powders with higher amounts of Cr (e.g., 8 or 12 at. %) showed no evidence of ferromagnetism. Following successful floating zone crystal growth of Cr-doped rutile crystals in argon, magnetic measurements taken from the as-grown crystals revealed no indication of RT ferromagnetism over the composition range 2 to 12 at. % Cr. A solubility limit for Cr into the rutile matrix of 3 at. % Cr at RT is suggested.

• OSTI ID: 21476520
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 7 Vol. 108; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHROMIUM
COHERENT SCATTERING
CRYSTAL GROWTH
CRYSTAL GROWTH METHODS
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DOPED MATERIALS
ELECTRON MICROSCOPY
ELEMENTS
FERROMAGNETIC MATERIALS
FERROMAGNETISM
MAGNETIC MATERIALS
MAGNETIC PROPERTIES
MAGNETISM
MAGNETIZATION
MATERIALS
MELTING
METALS
MICROSCOPY
MINERALS
MONOCRYSTALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
POWDERS
RADIOACTIVE MATERIALS
RADIOACTIVE MINERALS
RUTILE
SCANNING ELECTRON MICROSCOPY
SCATTERING
TEMPERATURE RANGE
TEMPERATURE RANGE 0273-0400 K
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
X-RAY DIFFRACTION
ZONE MELTING