Boron in Palladium: Interaction, Phase Formation and Phase Transformation

Max-Planck-Institut für Metallforschung Stuttgart, 2011. – 107 p.There has been outstanding progress in the development and understanding of interstitial alloys during the twentieth century. Interstitial alloys, especially those between transition metals and the small atoms of carbon, nitrogen, boron, oxygen and hydrogen, either taken singly or together,
constitute a significant section of the field of metallurgy. Many of these advances took place empirically or in specific technological contexts.
Interstitial solid solutions based on the transition metals are the most common important materials with attractive mechanical properties. Knowledge on crystallography of phases that can occur and phase transformations is a prerequisite to arrive at optimal properties at low and high temperatures to use this materials at optimal conditions.
One of the earliest works that dealt with criteria of formation of interstitial solid solutions are the works of H¨agg [1, 2]. These investigations suggest a (”H¨agg’s”) critical atomic radius ratio involving an interstitial solid solution based on a transition metal and a metalloid (like B, C, N and O) is formed only, if the atomic radius ratio of the two components ri/rm is less then 0.59.Table of Contents
The formation of interstitial solid solutions based on solvents showing the fcc structure; elastic versus chemical interaction.
The structure of the palladium-rich boride Pd5B (Pd16B3).
Powder diffraction data for borides Pd3B and Pd5B2 and the formation of an amorphous boride Pd2B.
Simultaneous determination of specimen temperature and specimen displacement in high temperature X-ray diffractometry applying Bragg-Brentano geometry.
Kurzfassung der Dissertation in deutscher Sprache.
Appendix Phasediagrams of the Pd-B system.