We designed a cell to house the salt made from a crystallized boron nitride (BN) that is capable to withstand both the corrosive nature of the salt and the high-temperature sample environment of interest. This specifically designed boron nitride cell is composed of two parts, the bottom salt compartment and the top cover; the cell is shown in Fig. . Molten salt can be sealed in this cell by bolting the four corners using stainless steel bolts and nuts.