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Title: Method for the preparation of photochromic insulating crystals

Abstract

A method for preparing reversible-photochromic magnesium oxide (MgO) crystals. Single crystals of MgO doped with both lithium (Li) and nickel (Ni) are grown by a conventional arc fusion method. The as-grown crystals are characterized by an amber coloration. The crystals lose the amber coloration and become photochromic when they are thermochemically reduced by heating at temperatures greater than 1000.degree. K. in a hydrogen atmosphere. Alternate irradiation with UV and visible light result in rejuvenation and bleaching of the amber coloration, respectively.

Inventors:
 [1];  [2];  [1];  [3]
  1. Oak Ridge, TN
  2. Mexico City, MX
  3. Zaragosa, ES
Issue Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
OSTI Identifier:
865774
Patent Number(s):
4572618
Assignee:
United States of America as represented by Department of Energy (Washington, DC)
Patent Classifications (CPCs):
G - PHYSICS G03 - PHOTOGRAPHY G03C - PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES
C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
method; preparation; photochromic; insulating; crystals; preparing; reversible-photochromic; magnesium; oxide; mgo; single; doped; lithium; nickel; grown; conventional; fusion; as-grown; characterized; amber; coloration; lose; thermochemically; reduced; heating; temperatures; 1000; degree; hydrogen; atmosphere; alternate; irradiation; visible; light; result; rejuvenation; bleaching; respectively; chemically reduce; visible light; single crystal; single crystals; magnesium oxide; hydrogen atmosphere; fusion method; chemically reduced; /359/117/423/501/

Citation Formats

Abraham, Marvin M, Boldu, Jose L, Chen, Yok, and Orera, Victor M. Method for the preparation of photochromic insulating crystals. United States: N. p., 1986. Web.
Abraham, Marvin M, Boldu, Jose L, Chen, Yok, & Orera, Victor M. Method for the preparation of photochromic insulating crystals. United States.
Abraham, Marvin M, Boldu, Jose L, Chen, Yok, and Orera, Victor M. Wed . "Method for the preparation of photochromic insulating crystals". United States. https://www.osti.gov/servlets/purl/865774.
@article{osti_865774,
title = {Method for the preparation of photochromic insulating crystals},
author = {Abraham, Marvin M and Boldu, Jose L and Chen, Yok and Orera, Victor M},
abstractNote = {A method for preparing reversible-photochromic magnesium oxide (MgO) crystals. Single crystals of MgO doped with both lithium (Li) and nickel (Ni) are grown by a conventional arc fusion method. The as-grown crystals are characterized by an amber coloration. The crystals lose the amber coloration and become photochromic when they are thermochemically reduced by heating at temperatures greater than 1000.degree. K. in a hydrogen atmosphere. Alternate irradiation with UV and visible light result in rejuvenation and bleaching of the amber coloration, respectively.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {1}
}

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