Abstract
Fairly large transparent crystals were hydrothermally in NaCl, KC1 solutions and pure water. The effects of low temperature (-78°K) in infrared absorption were studied by illuminating the samples with polarized light with the electric vectors parallel (E //C) and perpendicular (EIC) to the C-axis and the effects of radiation were studied exposing the samples to the neutron flux in a lOOKW nuclear reactor. We also performed nondestructive analysis of the A1 and Na impurity contents by neutron activation and y-ray spectrometry. Absorption bands due to the Al-OH-defect centers were observed at 3364 and 3304 cm- in the samples of as grown crystals in both NaCl and KC1 solution and pure water. The crystals in the NaCl solution did not exhibit the absorption bands at 3580, 3395, and 3345 cm-' which are generally exhibited by crystals in an alkaline solution In this respect, the profiles of absorption spectra of crystals in an NaCl solution are very similar to those of high quality natural quartz crystals.
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