Abstract
with y = 0.0, 0.1, 0.2, 0.3, 0.4 The glasses were obtained by melting pure reagents in a platinum crucible in an electric oven. The melts were quenched by casting them between two brass plates. Glass transition temperatures were detected by differential thermal analysis (DTA) and derivative differential thermal analysis (DDTA), the measurements being made in air at a scan rate of 10°Cmin -1 on powdered (-32 + 42 mesh) glass samples. A
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