Influence of electron irradiation on the properties of α-aluminum hydride polymorph

Changes in dielectric properties and thermal stability of the alpha-aluminum hydride polymorph (α-AlH 3 ) after irradiation with electrons with an energy of 7 MeV were studied by dielectric spectroscopy, differential scanning calorimetry, thermogravimetry, and powder X-ray diffraction. Dielectric relaxation was observed in α-AlH 3 samples irradiated using an electron beam with a frequency of the electric field of more than 5 MHz. The dielectric properties of α-AlH 3 samples depend on the absorbed dose and the duration of time elapsed after the cessation of irradiation, while the temperature of the onset of decomposition and the kinetics of thermal decomposition of α-AlH 3 samples vary little for absorbed doses up to 160 kGy. Radiation-chemical yield of the formation of the metallic phase during α-AlH 3 radiolysis was determined by potentiometric titration.