3. Experimental detailsSample of (GeS2)0:3(Sb2S3)0:7glass was preparedin a evacuated silica ampoule from pure elements(99.999% purity), by melting and homogenizationat 950 ?C for 12 h.Differential scanning calorimetric (DSC) mea-surements were performed on ?10 mg bulk sampleencapsulated in standard aluminum sample pans,in an atmosphere of dry nitrogen. The instrumentwas calibrated with indium, lead and zinc stan-dards. Experiments were performed under linearheating rate conditions.