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Charge trapping phenomena and recombination centers were studied in three Cs 2 HfCl 6 single crystals of slightly different stoichiometry grown by the vertical Bridgeman method. Electron paramagnetic resonance (EPR) spectra measured both before and after X-ray irradiation show creation of two distinct V k centers. One of them was V k (a) already known from a recent work by "R.

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Natural and synthetic samples of analcime and pollucite (both zeolites belonging to the analcime group) were studied by means of micro-Raman spectrometry, X-ray fluorescence analysis (XFA) and X-ray diffraction (XRD). On knowing the chemical and structural characteristics of each solid-solution member, the observed shift in the spectral position of the Raman active modes can be explained and used for phase determination. As shown, the distinction between members of the analcime-pollucite solid-solution series using Raman spectroscopy is significantly more conclusive than the corresponding XRD findings. Also, information about the structurally bound water inside the zeolite structure can be gained using Raman spectroscopy as long as a suitable exciting wavelength is selected.