Proprietà di superficie nei semiconduttori

Absorption Edge Anomalies in Polar Semiconductors and Dielectrics at Phase Transitions

“…This expression was successfully applied when studying common polar substances [S]. Frova [39], specifically for ferroelectrics, suggested the relation used when studying BaTiO, [3], KTaO, [39], NaNbO, [28], and SbSI [34]. Here It will be seen that only those theoretical curves where o( T) is approximated by (4)…”