title: Methods for quantifying the influences of pressure and temperature variation on metal hydride reaction rates measured under isochoric conditions.
abstract: Analysis techniques for determining gas-solid reaction rates from gas sorption measurements obtained under non-constant pressure and temperature conditions often neglect temporal variations in these quantities. Depending on the materials in question, this can lead to significant variations in the measured reaction rates. In this work, we present two new analysis techniques for comparison between various kinetic models and isochoric gas measurement data obtained under varying temperature and pressure conditions in a high pressure Sievert system. We introduce the integral pressure dependence method and the temperature dependence factor as means of correcting for experimental variations, improving model-measurement fidelity, and quantifying the effect that such variations can have on measured reaction rates. We use measurements of hydrogen absorption in LaNi5 and TiCrMn to demonstrate the effect of each of these methods and show that their use can provide quantitative improvements in interpretation of kinetics measurements.
authors.affiliation: School of Aeronautics and Astronautics, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Tyler G
authors.initials: TG
authors.lastname: Voskuilen
authors.forename: Timothée L
authors.initials: TL
authors.lastname: Pourpoint