Method for the preparation of photochromic insulating crystals
Patent
·
OSTI ID:865774
- Oak Ridge, TN
- Mexico City, MX
- Zaragosa, ES
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.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN
- DOE Contract Number:
- W-7405-ENG-26
- Assignee:
- United States of America as represented by Department of Energy (Washington, DC)
- Patent Number(s):
- US 4572618
- OSTI ID:
- 865774
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
/359/117/423/501/
1000
alternate
amber
as-grown
atmosphere
bleaching
characterized
chemically reduce
chemically reduced
coloration
conventional
crystals
degree
doped
fusion
fusion method
grown
heating
hydrogen
hydrogen atmosphere
insulating
irradiation
light
lithium
lose
magnesium
magnesium oxide
method
mgo
nickel
oxide
photochromic
preparation
preparing
reduced
rejuvenation
respectively
result
reversible-photochromic
single
single crystal
single crystals
temperatures
thermochemically
visible
visible light
1000
alternate
amber
as-grown
atmosphere
bleaching
characterized
chemically reduce
chemically reduced
coloration
conventional
crystals
degree
doped
fusion
fusion method
grown
heating
hydrogen
hydrogen atmosphere
insulating
irradiation
light
lithium
lose
magnesium
magnesium oxide
method
mgo
nickel
oxide
photochromic
preparation
preparing
reduced
rejuvenation
respectively
result
reversible-photochromic
single
single crystal
single crystals
temperatures
thermochemically
visible
visible light