Abstract
Millimeter-sized cobalt doped rutile crystals with a bi-pyramidal shape are obtained by chemical vapour transport using scroll-type H2Ti3O7 nanotubes as a precursor in which Co2+ ions are introduced by a simple ion exchange method prior to the growth. Despite the low concentration of Co2+ dopants (5 × 1019 cm−3), the resistivity of the single crystal shows a metallic behaviour above 50 K and the Seebeck coefficient has the signatures of polaronic quasiparticles. The magnetic properties of the material show a weak anti-ferromagnetic interaction between the spins on Co atoms below 50 K. This synthesis method could be beneficial for the growth of a large variety of doped TiO2 single crystals.
Highlights
Titanium dioxide, TiO2, a wide band gap semiconductor, has a broad range of applications
It has been reported that Co doped TiO2 rutile has ferromagnetic (FM) characteristics, which places this compound into the family of diluted magnetic semiconductors (DMS),[6] a potential candidate for spintronics applications
Since it is difficult to unravel the leading physical properties in the case of grain boundaries, defects, and stoichiometry issues, one way to proceed in the understanding of DMS would be to grow Co doped TiO2 single crystals
Summary
TiO2, a wide band gap semiconductor, has a broad range of applications. From nanotubes to single crystals: Co doped TiO2 Several attempts to grow Co-doped TiO2 single crystals using anatase and transition metal oxide powders as a starting material in chemical vapour transport (CVT) method were made.[12] the homogeneity and the dopant concentration of the samples were not satisfactory.
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