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Title: Method for the preparation of photochromic insulating crystals

Abstract

A method for preparing reversible-photochromic magnesium oxide (MgO) crystals is disclosed. 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 then 1000/sup 0/K in a hydrogen atmosphere. Alternate irradiation with uv and visible light result in rejuvenation and bleaching of the amber coloration, respectively.

Inventors:
; ; ;
Issue Date:
OSTI Identifier:
5701770
Application Number:
ON: DE85011606
Assignee:
Dept. of Energy
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; MAGNESIUM OXIDES; CRYSTAL GROWTH; PHOTOCHROMIC MATERIALS; BLEACHING; COLORATION; DOPED MATERIALS; ELECTRON SPIN RESONANCE; LITHIUM ADDITIONS; MONOCRYSTALS; NICKEL ADDITIONS; REDUCTION; ULTRAVIOLET RADIATION; VISIBLE RADIATION; ALKALINE EARTH METAL COMPOUNDS; ALLOYS; CHALCOGENIDES; CHEMICAL REACTIONS; CRYSTALS; ELECTROMAGNETIC RADIATION; LITHIUM ALLOYS; MAGNESIUM COMPOUNDS; MAGNETIC RESONANCE; MATERIALS; NICKEL ALLOYS; OXIDES; OXYGEN COMPOUNDS; RADIATIONS; RESONANCE; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Abraham, M M, Boldu, J L, Chen, Y, and Orera, V M. Method for the preparation of photochromic insulating crystals. United States: N. p., 1984. Web.
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Abraham, M M, Boldu, J L, Chen, Y, & Orera, V M. Method for the preparation of photochromic insulating crystals. United States.
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Abraham, M M, Boldu, J L, Chen, Y, and Orera, V M. Fri . "Method for the preparation of photochromic insulating crystals". United States.
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@article{osti_5701770,
title = {Method for the preparation of photochromic insulating crystals},
author = {Abraham, M M and Boldu, J L and Chen, Y and Orera, V M},
abstractNote = {A method for preparing reversible-photochromic magnesium oxide (MgO) crystals is disclosed. 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 then 1000/sup 0/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 = {1984},
month = {9}
}
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Patent:
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