The HPLT treatments were conducted in an experimental HPLT unit containing a high pressure vessel with a volume of 265 mL (Sitec Sieber AG, Zurich, Switzerland), which was connected to a DS XHW-1373 air driven high pressure pump (Haskel, CA, USA).
The HPLT treatments were conducted in an experimental HPLT unit containing a high pressure vessel with a volume of 265 mL (Sitec Sieber AG, Zurich, Switzerland), which was connected to a DS XHW-1373 air driven high pressure pump (Haskel, CA, USA).