The correlation between ionicity of metal-hydrogen bonds in hydrides and their thermal firmness

The information obtained by the X-ray absorption spectroscopy method about the process of charge transfer from atoms of metal to hydrogen atoms in metal hydrides of 111, 1Y groups and in hydrides of intermetallic compounds of AB and AB(5) composition has been used to determine correlation between thermal stability of mentioned hydrides and the degree of ionisity of their Me-H bonds. A supposition, that found out correlation reflects the dependence of height of activation barriers of the process of associative desorption of hydrogen in hydrides from the value of transfered charge to hydrogen, i.e. the value of ion component Me-H bonds of hydrides has been made.