How muons see the motion of negative hydrogen ions in solids at high temperatures

In order to clarify the mechanism of negative hydrogen ion (hydride) conduction in solids, we wish to propose a continuation muon-spin rotation and relaxation experiment on La2LiHO3, LaSrLiH2O2, and Sr2LiH3O in the temperature range between 300 and 800 K using a furnace on EMU. According to our first muSR experiment on these compounds in the temperature range between 10 and 600 K using CCR in December 2016, a H-mu-H bond is formed even at temperatures below 400 K in LaSrLiH2O2, whereas, above 450~K, such H- starts to diffuse. However, the diffusion behavior is enhanced with temperature even at 600 K for the three compounds. Thus, particularly to clarify whether the hydride diffusion is enhanced with temperature according to a thermal activation process, we want to measure the muSR spectra at high temperatures.