Fluorine

Electron Backscatter Diffraction (EBSD)

Calcium Fluoride

Calcium Fluoride EBSD pattern

An early EBSD pattern from CaF2 recorded on film.

H. Boersch (1937). "Über Bänder bei Elektronenbeugung." Physikalische Zeitschrift 38: 1000-1004.

Magnesium Fluoride

Color coded orientation maps of polycrystalline Magnesium Fluoride
Color coded orientation maps of polycrystalline MgF2 after (a) hot-pressing and after (b-e) annealing for 1 hour at the temperatures listed. (By permission of the authors [1] and sponsoring agency – Naval Air Warfare Center AD)

Optical transmittance of polycrystalline Magnesium Fluoride
Optical transmittance of polycrystalline MgF2 as a function of grain size at five difference wavelengths. The solid lines are from an analytical approximation [2].

[1] T.-C. Wen and D. K. Shetty (2009). “Birefringence and grain-size effects on optical transmittance of polycrystalline magnesium fluoride.” Proceedings of the SPIE – Window and Dome Technologies and Materials XI, 7302: 73020Z-1-73020Z-6.
[2] R. Apetz and M.P.B. van Bruggen (2003. “Transparent Alumina: A Light-Scattering Model.” Journal of the American Ceramic Society, 86: 480-486.