Readme file for data relating to "Enhancement of Low Temperature Superionic Conductivity by Suppression of Li Site Ordering in Li7Si2–xGexS7I"

Single crystal X-ray diffraction:
The data were recorded on beamline I19 at Diamond Light Source (Oxfordshire, U.K.) using silicon double crystal monochromatic
synchrotron radiation (λ = 0.6889 Å, Pilatus 2M detector).
The data were collected at five different temperatures, i.e., 30, 100, 240, 300, and 310 K. Data reduction was performed with Xia2 programs.

Powder X-ray diffraction:
Synchrotron powder XRD was performed at the I11 beamline at Diamond Light Source (Oxfordshire, U.K.), with an incident wavelength 
of 0.8239 Å using a wide-angle position sensitive (PSD) detector. The experiments were performed at room temperature with samples
sealed in Ø = 0.5 mm borosilicate glass capillaries. The synchrotron data is in .xye format and presented in a 3 column: 2Theta, counts and error.
Lab data was carried out using Rigaku SmartLab diffractometer with monochromatic Mo radiation (Kα1, λ = 0.7093 Å) in 
Debye−Scherrer transmission geometry. The Lab data is in .raw format.

AC Impedance Spectroscopy:
AC impedance measurements were performed on Au|SE|Au configuration using an impedance analyser (Keysight impedance analyser E4990A).
A sputtered gold coating of ~2 nm thickness was used as the ion blocking electrodes. The experimental density of the sintered pellets 
was 89-91% of the theoretical maximum. The sintered pellets were polished with sandpaper for a cleaner and smoother surface prior to 
gold sputtering. The thickness and diameters of the pellets used for the measurements are in the range of 0.81-1.68 and 4.6-4.8 mm, respectively.
Data were collected every 10 K from 200 to 360 K with an equilibration time of 30 min for each step and were normalized for geometry of the pellets.
The data is in .z formats that is readable in ZView2 software which can be obtained at http://www.scribner.com.

DC polarization:
DC polarization measurements were performed on a Au|SE|Au symmetric cell using a Keithley 6430 Sub-Femtoamp Remote SourceMeter.
The data were collected at 303 K by applying constant bias voltages of 0.05, 0.1, and 0.2 for 4, 6, and 8 h, respectively.
Data is presented in 4 column format: time(s) for whole measurement, time(s) for each bias voltages, current (A) and Voltage applied (V)

Nuclear magnetic resonance：
Static 7Li variable temperature solid-state NMR experiments in the 117 K - 294 K temperature range were conducted on a 9.4 T Bruker Avance III HD
Spectrometer equipped with a 4 mm HXY probe in double resonance mode tuned to ν0(7Li) = 155.5 MHz.
All one pulse spectra were obtained with a hard π⁄2 pulse of duration 1.5 us at a radio frequency (rf) field amplitude of ν1(7Li) = 83 kHz using 
quantitative recycle delays of 5 times the spin-lattice relaxation time constant in the laboratory frame.
Spin-lattice relaxation time constants in the rotating frame, T_1ρ, were obtained with a spin-lock pulse sequence at frequency amplitudes ν1 
of 20 kHz, 50 kHz, and 80 kHz. The temperature calibration was carried out using the empirical correlation between the sensor temperature 
and the known chemical shift of 207Pb in Pb(NO3)2. The sample was flame-sealed in a Pyrex insert and placed in a 4 mm zirconia rotor. 
All chemical shifts were referenced to 10 mM LiCl in D2O at 0 ppm.