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Neutron-induced Autoradiography of Lithium Silicate Glasses.
J Materials Sci 1970 May; 5(5):425-433
Immiscibilities between silica and lithium disilicate were investigated. Alpha particles ejected from 6li atoms by thermal neutrons were used to autoradiograph surfaces representing diffusion- zone cross sections. Etchant-enlarged alpha tracks in nitrocellulose disclosed the distribution of lithium. For autoradiography, procedural details were established, suitable operating conditions were selected, and the method was calibrated. For diffusion, adequate couples had to be prepared. Subsequent experiments indicated phase separations along an 885 deg c isotherm of the silica-lithium disilicate system. There was evidence of metastable compositions near 30, 25, 20, 16, 11, and 7 mole-percent of lithia in silica. These results have been given a very tentative interpretation: the first two compositions may correspond to metastable extensions of liquidus boundaries, projected through a eutectic point of the system. The third and sixth compositions are probably points on a liquid-liquid miscibility boundary, and the fourth and fifth compositions could be on an associated spinodal boundary.
Issue of Publication
J. Materials Sci., V. 5, No. 5, May 1970, PP. 425-433
Page last reviewed: April 12, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division