In recent years, particularly since the production of glass ceramics, the phenomenon of microseparation into layers in glasses has been the subject of detailed study by electron microscopy [1-3], x-ray struttural analysts [4,5], and infrared spectroscopy [6]. One of the aims of these studies is to establish the chemical composition and structure of the liquation drops. It is extremely difficult, however, even for the ease of binary glasses, to obtain an unambiguous answer to this question by the above methods of study. The study of the spectral-luminescent characteristics of glasses containing ions of rare earth elements as activators appears very promising for this purpose, in view of the high sensitivity of the method.In our studies, the glasses were prepared from "analytically pure" grade reagents in open corundum crucibles in a Silit furnace. The activator was introduced into the charge in the form of dysprosium oxide in quantities of 0.5, 3.4, and 6.8 wt.~c to 100~c of glass. The concentration of iron in the glass was kept to a minimum. The luminescence spectra in the range 400-650 nm were recorded at room temperature by means of a DFS-12 double diffraction monoehromator, and the quenching of the luminescence was recorded on an assembly based on a UM-2 monochromator and operating according to the principle of the two-disc phosphoroscope.The luminescence of the glasses was excited with radiation with wavelength 365 nm from a DRSh-250 mercury lamp, passed through a UFS-2 filter and copper sulfate solution. An FI~U-27 photomultiplier was usedas a radiation receiver. In the determination of the spectral sensitivity of the photomultiplier we used a tungsten ribbon-filament lamp with color temperature 2840~The radiation of the glasses was recorded over a period of 8 9 10 .3 sec from the moment when the excitation stopped, in the spectral range with maximum 576 nm. The time resolution of the assembly was not less than 10 .4 see. The quenching of the luminescence was measured at various points. The infrared spectra were recorded on a UR-10 spectrometer.We first studied the spectra and duration of the luminescence of binary glasses, activated with dysprosium, in the system R20-SiO 2, where R = Li, Na, K, or Rb. These glasses, particularly those of the Li20-SiO 2 and Na20-SiO 2 systems, have been fairly well studied by infrared spectroscopy, low-angle x-ray
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