The Photochromism of Ag2S-HgI2
- 1 August 1968
- journal article
- research article
- Published by Taylor & Francis in Philosophical Magazine
- Vol. 18 (152) , 345-352
- https://doi.org/10.1080/00318086.1968.11716236
Abstract
The bleaching kinetics of the photochromic material formed by the solid state reaction between silver sulphide and mercuric iodide at a molar ratio of 1: 4 have been studied. The thermal bleaching followed the law: where n is the concentration of coloured systems at time i, e is an activation energy term for the bleaching, A 0 and b are constants. Preliminary measurements indicate that ∈≃0·56 ev. It is suggested that the bleaching depends upon the cation vacancy concentration in the material, with silver ions diffusing via these vacancies from regions of high concentration near the surface into the bulk of the material.Keywords
This publication has 3 references indexed in Scilit:
- Radiation Induced Colour Centres in Fused QuartzProceedings of the Physical Society. Section B, 1955
- Photosensitive and Phototropic Products of Solid State Reaction between Silver Sulfide and Mercuric IodideThe Journal of Physical Chemistry, 1954
- Covalent Radii of Atoms and Interatomic Distances in Crystals containing Electron-Pair BondsZeitschrift für Kristallographie - Crystalline Materials, 1934