Pt. 1-Magneto-optic Effects in Glass 

JSGT 1950 V34 T220-T237

Measurements of the Verdet constants for a number of optical glasses have been made, and it is shown that the plot of Verdet constant against reciprocal dispersion for all glasses, and for certain liquids and crystals, yields a smooth curve. Deviations from the simple Becquerel relationship have been calculated, and the value of the magneto-optic anomaly thus obtained has been correlated with the nature of the chemical bonds present in crystals and glasses. On this basis it is deduced that, particularly in dense barium crown glasses, barium can participate in the glass-network structure to a greater extent than has hitherto been assumed. Similarly, lanthanum and thorium in glass appear to have appreciable covalent bond character and to beh1we as network-forming atoms.

H. Cole