Fourier transform infrared analysis of ceramic powders: Quantitative determination of alpha, beta, and amorphous phases of silicon nitride

Abstract
Fourier transform infrared spectroscopy (FT–IR) forms the basis for determining the morphological composition of mixtures containing alpha, beta, and amorphous phases of silicon nitride. The analytical technique, involving multiple linear regression treatment of Kubelka-Munk absorbance values from diffuse reflectance measurements, yields specific percent composition data for the amorphous phase as well as the crystalline phases in ternary mixtures of 0–1% by weight Si3N4 in potassium bromide.