摘要
The nominal Li concentration giving a maximum room temperature Li-ion conductivity 蟽Li 鈮?#xA0;3.45 脳 10鈭? S cm鈭? with an Ea 鈮?#xA0;0.438 eV in the system Li7鈭?em>xLa3Hf2鈭?em>xTaxO12 fired in an alumina crucible at 1130 掳C for 48 h occurs in the narrow range of x = 0.45 卤 0.05. The samples were prepared by solid-state reaction and characterized by XRD, SEM, electrochemical impedance spectroscopy and 7Li MAS NMR measurements.