Zgs interface

The ionic conductivity of the as-prepared La ${}_{0.9}$ Ba ${}_{0.1}$ F ${}_{2.9}$ was checked by solid-state impedance spectroscopy. Hence, the powder samples were pressed to cylindrical pellets with a diameter of 5 mm and a thickness of ca. 1 mm; we used a press of P. O. Weber and applied a uniaxial force of 0.5 t. Ion blocking Pt electrodes with a thickness of 100 nm were applied on both sides of the pellet by sputtering (Leica sputter device (EM SCD050, Leica Microsystems, Wetzlar, DE)). Impedance data were recorded with a Novocontrol Concept 80 broadband spectrometer in combination with an active BDS 1200 cell [28 ] and a ZGS interface (Novocontrol). Impedance data were recorded over a frequency range from 10 ${}^{-2}$ Hz to 10 ${}^7$ Hz at temperatures ranging from 20 to 200 ${}^{\circ }$ C. A QUATRO cryo-system (Novocontrol, Montabaur, DE) controlled the temperature of all measurements, which were carried out under a constant flow of dry, freshly evaporated N ${}_2$ gas.

The overall conductivity of site-disordered Li[In_xLi_y]Br₄ was investigated by broadband conductivity spectroscopy. Small amounts of the powdered sample were pressed into cylindrical pellets (5 mm in diameter) by applying a uniaxial pressure of 0.8 GPa. The pellets were equipped with ion-blocking electrodes (Pt, 100 nm in thickness) by sputtering (Leica, EM SCD050). Finally, the pellets were put in an air-tight sample holder. All preparation steps were carried out inside an Ar-filled glovebox (H₂O, O₂ < 0.1 ppm). Alternating current (ac) impedance data were recorded with a Novocontrol Concept 80 spectrometer in combination with an active BDS 1200 cell and a ZGS interface (Novocontrol). A QUATRO cryosystem was employed to precisely control and monitor the temperature via Pt100 thermocouples. Here, we varied the temperature T from −40 to 100°C. The frequency range covered for each isothermal measurement was 10⁻²–10⁷Hz.