Absorption Coefficient of Molten Aluminum Oxide in Semitransparent Spectral Range

Abstract

A crit. compilation and anal. of all the available exptl. data and approxn. formulas for the wavelength and temp. dependences of the absorption coeff. of molten aluminum oxide in semitransparent region are presented. The main factors and the influence of physicochem. processes on the value of the absorption coeff. are considered. Special attention is focused on possible reasons for large values of absorption of the alumina melt as compared to the crystal near melting temp. It is shown that the available data can be divided into two groups, according to the level of absorption. The first group includes the results of the research of optical properties of solid propellant combustion products, and the second group-the results of the research of single crystal melts and some other high-purity molten aluminum oxides. Along with the detailed anal. of the absorption coeff., also a brief anal. of available data on the refractive index has been done. [on SciFinder(R)]