Abstract
This paper deals with the experimental results of calcite ( CaCO 3 ) growth on seeds parallel to rhombohedral { 1 0 1 ¯ 1 } , pinacoidal {0 0 0 1} and prismatic { 1 1 2 ¯ 0 } faces. The process was carried out by the hydrothermal method in the system CaCO 3 – NH 4 Br – H 2 O . Autoclaves (24–1500 liters) were equipped with titanium inserts. Optical properties of the grown crystals have been investigated by means of spectrophotometry. Laser radiation initiates red luminescence whose intensity depends strongly on the radiant emittance that is probably connected with impurity absorption. The grown crystals are analogous to Iceland spar in their properties but excel them in optical homogeneity. Dispersion of refractive indices (dependence of N o and N e on the length of light wave) was measured and optical inhomogeneities indicated by refractive indices of calcite single crystals were studied.
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