skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

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

Abstract

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 ca. 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}. 5 figs.

Inventors:
;
Issue Date:
Research Org.:
Lockheed Martin Energy Research Corporation
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
335489
Patent Number(s):
5,885,665
Application Number:
PAN: 8-853,947
Assignee:
Dept. of Energy, Washington, DC (United States) PTO; SCA: 360200; PA: EDB-99:046116; SN: 99002077330
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Resource Relation:
Other Information: PBD: 23 Mar 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; VANADIUM OXIDES; ION IMPLANTATION; SAPPHIRE; PRECIPITATION; CRYSTAL-PHASE TRANSFORMATIONS; OPTICAL PROPERTIES; FABRICATION

Citation Formats

Gea, L.A., and Boatner, L.A. VO{sub 2} precipitates for self-protected optical surfaces. United States: N. p., 1999. Web.
Gea, L.A., & Boatner, L.A. VO{sub 2} precipitates for self-protected optical surfaces. United States.
Gea, L.A., and Boatner, L.A. Tue . "VO{sub 2} precipitates for self-protected optical surfaces". United States.
@article{osti_335489,
title = {VO{sub 2} precipitates for self-protected optical surfaces},
author = {Gea, L.A. and Boatner, L.A.},
abstractNote = {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 ca. 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}. 5 figs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {3}
}