Heat capacity measurements of NbH alloys and an analysis of phase transition process

Abstract

Heat capacity measurements have been made on NbH_0.80 at the temperature between 300 and 420 K by adiabatic calorimeter. The behavior of heat capacity for β - α' phase transition of NbH_0.80 investigated first-order transition with narrow and triangular shape. Activation energy of β phase and pre-transition region for NbH_0.80 determined E_act = 0.13 (eV) and E_act = 0.32 (eV), respectively.