Hydrogen in Zirconium. Part 1

The data on hydrogen behavior in zirconium has been systematized. The proposed materials relate to a number of the main physicochemical characteristics of the two participants in the reaction of Zr-H (H and Zr) and to the basic data of the Zr-H system as a whole. The information on the hydrogen atoms position in the Zr lattice (predominantly tetragonal voids) and its dynamics is provided. It should be noted that the debatable question is whether hydrogen dissolved in zirconium has the state of neutral atoms H⁰, or ions (H⁺, H^-, H^δ-, H^δ+), 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 metals (M)are expounded on. The paper also presents thermodynamics of adsorption and absorption of hydrogen by zirconium. Much attention is paid to the correlation characteristics of the interaction in the system M-H to the position of M in the periodic table of elements and evaluating the implementation of these correlations with respect to the system Zr-H. The information about the diffusion mobility of hydrogen in zirconium is provided. The information collected focused on the creation of the source database on the interaction in the system Zr-H, necessary for conducting research on delayed hydride cracking