Abstract
Structural changes occurring inside electron microscopes may be classified intofive groups, i. e. phase variation due to heating, crystal growth due to heating, solid state reaction due to heating, phase variation due to cooling and lattice imperfection due to electron irradiation. In-situ observations on these structural changes in oxides or sulfides like VS1, 155, WO2.9, V6O13 or 4Nb2O5.9WO3 are demonstrated using 100KV and 1 MV high-resolution transmission electron microscopes (HRTEM). Heating of crystalfragments is achieved by an irradiation of intense electron beam. Technical possibilities for extending the HRTEM method into very low or high temperature range is discussed.
