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Photochromic coating by vacuum deposition

Authors
Journal
Thin Solid Films
0040-6090
Publisher
Elsevier
Publication Date
Volume
30
Issue
2
Identifiers
DOI: 10.1016/0040-6090(75)90090-5
Disciplines
  • Chemistry

Abstract

Abstract Photochronic thin films have been obtained by the simultaneous deposition of silicon monoxide, lead silicate, aluminum chloride and copper-sensitized silver halide, followed by a heat treatment in the dark and in air at 100°–200°C for several hours. The growth of silver halide microcrystals in the film is explained by a simple diffusion-limited process. The fading process can be described by a second order chemical reaction, which has been applied to a type of photochromic glass containing silver halide microcrystals in the glass matrix. The half-fading and half-darkening time of typical films were 10–20 min and 5–20 min, respectively.

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