VO{sub 2} precipitates for self-protected optical surfaces

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Description

A method for forming crystallographically coherent precipitates of vanadium dioxide in the near-surface region of sapphire and the resulting product is disclosed. Ions of vanadium and oxygen are stoichiometrically implanted into a sapphire substrate (Al{sub 2}O{sub 3}), and subsequently annealed to form vanadium dioxide precipitates in the substrate. The embedded VO{sub 2} precipitates, which are three-dimensionally oriented with respect to the crystal axes of the Al{sub 2}O{sub 3} host lattice, undergo a first-order monoclinic-to-tetragonal (and also semiconducting-to- metallic) phase transition at {minus}77 C. This transformation is accompanied by a significant variation in the optical transmission of the implanted region and ... continued below

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19 p.

Creation Information

Gea, Laurence A. & Boatner, Lynn A. December 1, 1997.

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Description

A method for forming crystallographically coherent precipitates of vanadium dioxide in the near-surface region of sapphire and the resulting product is disclosed. Ions of vanadium and oxygen are stoichiometrically implanted into a sapphire substrate (Al{sub 2}O{sub 3}), and subsequently annealed to form vanadium dioxide precipitates in the substrate. The embedded VO{sub 2} precipitates, which are three-dimensionally oriented with respect to the crystal axes of the Al{sub 2}O{sub 3} host lattice, undergo a first-order monoclinic-to-tetragonal (and also semiconducting-to- metallic) phase transition at {minus}77 C. This transformation is accompanied by a significant variation in the optical transmission of the implanted region and results in the formation of an optically active, thermally switchable surface region on Al{sub 2}O{sub 3}.

Physical Description

19 p.

Notes

OSTI as DE00756782

Medium: P; Size: 19 pages

Source

  • Patent File Date: 1997 May 09

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  • Report No.: PATENTS-US--A8853947
  • Grant Number: AC05-96OR22464
  • Office of Scientific & Technical Information Report Number: 756782
  • Archival Resource Key: ark:/67531/metadc709566

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • December 1, 1997

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 7, 2017, 4:32 p.m.

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Gea, Laurence A. & Boatner, Lynn A. VO{sub 2} precipitates for self-protected optical surfaces, patent, December 1, 1997; Tennessee. (digital.library.unt.edu/ark:/67531/metadc709566/: accessed January 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.