MRASURING METHOD FOR IMPURITY DIFFUSION COEFFICIENT IN SOLID

摘要

PURPOSE:To enable easily measuring the diffusion coefficient in an actual material such as steel and use the obtained diffusion coefficient for predicting precipitation and phase separation by applying the method for obtaining easily and simply the diffusion coefficient of impurity in solid. CONSTITUTION:The density distribution in the direction of diffusion of solute atoms transmitting by diffusion inside from solid surface is obtained using the density of diffusion atoms quantified from the rate of spattering of each atom obtained from the emission intensity of solid structure atoms in each spattering stage in glow discharge emission spectrometry method, and the spattering depth calculated with the spattering rate and the density of each component solid and the obtained density distribution is matched with the solution of a diffusion equation to obtain the diffusion coefficient of the solute atoms. By this, the diffusion coefficient of impurity is measured more easily than the method analyzing a radioactive atom in depth direction or analyzing diffusion cross section microscopically.