Fig. 4: Temperature dependence of viscosity for (99−x)La2O3–xNb2O5–1Fe2O3 melts.
From: Glass-forming ability of La2O3–Nb2O5 evaluated via thermophysical properties under microgravity

a x = 99. b x = 89. c x = 79. d x = 69. e x = 59. f x = 49. g x = 39. h x = 29.