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The formation of Al{sub 2}O{sub 3}/V{sub 2}O{sub 3} multilayer structures by high-dose ion implantation

Description: High-resolution TEM, RBS-channeling and x-ray-diffraction techniques have been used to characterize multilayered structures formed by the high-dose co-implantation of vanadium and oxygen into single crystals of {alpha}-Al{sub 2}O{sub 3}. Thin, two-dimensional multilayered structures have been formed by implanting c-axis and a-axis-oriented single crystals of Al{sub 2}O{sub 3} at room temperature with vanadium (10{sup 17} ions/cm{sup 2} at 300 keV) and oxygen (2 x 10{sup 17} ions/cm{sup 2}, 120 … more
Date: April 1, 1995
Creator: Gea, L. A.; Boatner, L. A.; Budai, J. D. & Rankin, J.
Partner: UNT Libraries Government Documents Department
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Optically Active Surfaces Formed by Ion Implantation and Thermal Treatment

Description: Embedded VO{sub 2} precipitates have been formed in single-crystal sapphire by the ion co-implantation of vanadium and oxygen and subsequent thermal annealing. The embedded VO{sub 2} particles have been shown to exhibit an optical switching behavior that is comparable to that of continuous thin films. In this work, the mechanisms of formation of these optically active particles are investigated. It is shown that precipitation of the vanadium dioxide phase is favored when the thermal treatment i… more
Date: August 1, 1996
Creator: Gea, L. A.; Boatner, L. A.; Evans, H. M. & Zuhr, R.
Partner: UNT Libraries Government Documents Department
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Coherent V{sub 2}O{sub 3} precipitates in {alpha}-Al{sub 2}O{sub 3} co-implanted with vanadium and oxygen

Description: The oxides of vanadium VO{sub 2} and V{sub 2}O{sub 3} are of fundamental and practical interest since they undergo structural phase transitions during which large variations in their optical and electronic properties are observed. In the present work, the authors report the formation of buried precipitates of V{sub 2}O{sub 3} in sapphire by ion implantation and thermal annealing. It was found that the co-implantation of oxygen and vanadium was required in order to form nanophase V{sub 2}O{sub 3… more
Date: December 31, 1994
Creator: Gea, L. A.; Boatner, L. A.; Budai, J. D. & Rankin, J.
Partner: UNT Libraries Government Documents Department
open access

Optical switching of coherent VO{sub 2} precipitates embedded in sapphire

Description: In this work, we report the formation of a new type of active or {open_quotes}smart{close_quote} surface that is produced by ion implantation and thermal processing. By co-implanting vanadium and oxygen into a single- crystal sapphire substrate and annealing the system under appropriate conditions, it was possible to form buried precipitates of vanadium dioxide that were crystallographically oriented with respect to the host Al{sub 2}O{sub 3} lattice. The implanted VO{sub 2} precipitate system … more
Date: December 31, 1995
Creator: Gea, L. A.; Boatner, L. A.; Budai, J. D. & Zuhr, R. A.
Partner: UNT Libraries Government Documents Department
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