HYDROGEN IN ZIRCONIUM. Part 1

The data on hydrogen behavior in zirconium have been systematized. The proposed study deals with a number of basic physicochemical characteristics of the two participants in the Zr-H (H and Zr) reaction, as well as the basic data on Zr-H system in whole. The data on hydrogen atoms position in Zr lattice (predominantly tetragonal voids) and its dynamics are provided. It should be noted that whether the zirconium-dissolved hydrogen has a state of neutral atoms H-0 or ions (H+, H-, H delta-, H delta+) is a disputable question, while it is clearly stated that hydrogen is not found in zirconium in the molecular state and does not form bubbles filled with molecular hydrogen gas. The basic principles of interaction of hydrogen with metal (M) are reported. The study presents thermodynamics of hydrogen adsorption and absorption by zirconium. Great attention is paid to the correlation characteristics of M-H system interaction with M position in the periodic table, and evaluating implementation of these correlations with respect to the Zr-H system. The data on the diffusion mobility of hydrogen in zirconium are provided. The collected data are aimed at creating a source data base on interaction in Zr-H system required for investigations on delayed hydride cracking.