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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 .about.77.degree. 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.

Inventors:
 [1];  [2]
  1. (Knoxville, TN)
  2. (Oak Ridge, TN)
Issue Date:
Research Org.:
LOCKHEED MARTIN ENERGY RES COR
OSTI Identifier:
872208
Patent Number(s):
5885665
Assignee:
United States of America as represented by United States (Washington, DC) ORNL
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
vo; precipitates; self-protected; optical; surfaces; method; forming; crystallographically; coherent; vanadium; dioxide; near-surface; region; sapphire; resulting; product; disclosed; oxygen; stoichiometrically; implanted; substrate; subsequently; annealed; form; embedded; three-dimensionally; oriented; respect; crystal; axes; host; lattice; undergo; first-order; monoclinic-to-tetragonal; semiconducting-to-metallic; phase; transition; 77; degree; transformation; accompanied; significant; variation; transmission; results; formation; optically; active; thermally; switchable; surface; optical transmission; surface region; resulting product; optically active; phase transition; optical surfaces; near-surface region; optical surface; implanted region; sapphire substrate; /427/117/

Citation Formats

Gea, Laurence A., and Boatner, Lynn A. VO.sub.2 precipitates for self-protected optical surfaces. United States: N. p., 1999. Web.
Gea, Laurence A., & Boatner, Lynn A. VO.sub.2 precipitates for self-protected optical surfaces. United States.
Gea, Laurence A., and Boatner, Lynn A. Fri . "VO.sub.2 precipitates for self-protected optical surfaces". United States. https://www.osti.gov/servlets/purl/872208.
@article{osti_872208,
title = {VO.sub.2 precipitates for self-protected optical surfaces},
author = {Gea, Laurence A. and Boatner, Lynn 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 .about.77.degree. 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1999},
month = {1}
}

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