Abstract
Gypsum single crystals have been irradiated with different doses of neutrons and their hardness determined by a Vicker's microhardness indentor. It is observed that the hardness of the irradiated crystal decreases with the increase in the total dose of irradiation with neutrons and the variation of hardness within the irradiated crystal is similar to that of the crystal heated to the dehydration temperature and then allowed to cool. From the Laue X-ray diffraction studies of irradiated crystals, distortion of the lattice is observed and it is shown that similar distortion in the lattice is produced when the crystals are heated to the dehydration temperature and cooled. Infra-red absorption studies of the irradiated, heated and the unirradiated crystals have been made. Less extended peaks relating to lattice water and peaks relating to free sulphate group on the irradiated and heated crystals are identified. The implications are discussed.
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