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Neutron-induced Autoradiography of Lithium Silicate Glasses.

Authors
Wood-FW; Roberson-AH
Source
J Materials Sci 1970 May; 5(5):425-433
Link
NIOSHTIC No.
10010184
Abstract
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.
Publication Date
19700501
Document Type
OP;
Fiscal Year
1970
NTIS Accession No.
NTIS Price
Identifying No.
OP 106-70
Issue of Publication
5
NIOSH Division
ALRC;
Source Name
J. Materials Sci., V. 5, No. 5, May 1970, PP. 425-433
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