In situ high temperature neutron diffraction study of Sr/Mg-doped lanthanum gallate superionic conductors under microwave irradiation

摘要

First in situ high temperature neutron scattering experiments under microwave irradiation have been carried out on a superionic conductor, doped LaGaO3. A definite non-thermal microwave effect on the resulting crystallographic structures was discovered mainly derived from oppositechanges of the lattice constants and the atomic displacement parameters. These effects are related to changes in the phonon density of states (DOS) due to coupling of the microwave field via (anharmonic) multi phonon processes, limited phonon life times and local modes arising from the defects. The problem of defining a temperature in a microwave field due to the non-equilibrium DOS is discussed.