Abstract
The intensity of the light scattered from phase‐separated glasses, rather than being constant as a function of angle as expected, exhibits increased backscattering. When interference effects can be neglected, Goldstein's diffusion‐zone model, proposed to explain the scattering data, has been supported by experimental results. Although the refractive‐index profile predicted by Goldstein seems to agree well with existing data, the present workers believe that the source of this profile is not a diffusion zone but rather the stress that results from the differing thermal‐expansion characteristics of the 2 phases. By measuring depolarized scattering as a function of temperature in various scattering planes, the 2 models were compared directly. The diffusion model is shown to be inappropriate, whereas the qualitative predictions of the proposed stress model are confirmed, and the model is established.
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