Calorimetric studies of highly loaded deuterides and hydrides of palladium

A search for excess heat production from highly loaded deuterides of palladium was carried out using a closed isoperibolic calorimeter. The main aim of these studies was to test the hypothesis that the production of excess heat from electrolytically prepared deuterides of palladium only occurs when (amongst other conditions) the D/Pd loading ratio exceeds a value of about 0.85-0.90, as estimated by resistance ratio measurements. However, despite the achievement of D/Pd loading ratios in excess of 0.90, no excess heat was observed in any of the experiments within the estimated experimental error of ± 1.5%.