THERMOSTIMULATED EXOELECTRONIC EMISSION AND THERMOLUMINESCENCE OF VARIOUS ALPHA-AL2O3 SAMPLES

A systematic study of TSEE curves obtained after UV or X irradiations at 77 K from alumina samples of various origin is reported. These curves are systematically compared with TL glow curves recorded in similar conditions. Nine positions for thermostimulated peaks are detected in the 77 to 600 K range. These peaks appear with various occurrence frequencies. Except for the first peak (100 K, peak A) which does not exist in the majority of the TSEE curves recorded, the main TSEE peaks coincide fairly well with the correspondent TL peaks. A mechanism is proposed to interpret the behaviour of peak A.