Dense pellets (~88% theoretical density) were obtained by Spark Plasma Sintering (SPS) of phase-pure CuBiSeCl2 powder at 300 MPa and 270 °C for 5 min in a 10 -3 mbar vacuum using a commercial Thermal Technology LLC DCS10 furnace. Powder samples (∼0.45 g) were pressed in a 10 mm diameter, graphite-foil-lined, tungsten carbide die set (with 6% Co binder). Heating and pressure ramp rates were set to 20 °C / min and 100 MPa / min, respectively. The temperature was monitored through a borehole in the side of the die set using a thermocouple. After pressing, the pellets were lightly polished with SiC paper to remove the graphite foil from the pellet surface.