Composition not stated
P-complambda_20 = 320.4 - 1.829 x - 5.485 x^2 nm; lambda_15 = 321.9 - 1.597 x - 5.745 x^2 nm; x = (mol% Li2O) - 48.38nm
method absorption coefficient 20 (or 15) cm^-1; E parallel to c, k perpendicular to c; T 22 °C; default record
Volk & Wöhlecke, Springer Series in Materials Science 115 (2009), Eqs. (6.5)-(6.6), p. 142original: Kovács et al. 1997 (credited in Fig. 6.4)