Method for the preparation of photochromic insulating crystals

Details Method for the preparation of photochromic insulating crystals Method for the preparation of photochromic insulating crystals

1984-09-28

1986-02-25

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

501 1, 501 13, 501 86, 156605, 156DIG78, 423265, 423275, G02B 523, C04B 3500

Patent

active

045726183

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.

REFERENCES:
patent: 4376755 (1983-03-01), Narayan et al.
"Photochromic Effect in Magnesium Oxide Containing Lithium and Nickel Impties," Mondragon et al., J. Appl. Physics, 57(2), 509-11.

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