“…Synthesis from the elements in sealed tubes is the most widely reported method and has been demonstrated for Cu 3 SbS 3 , 83 'tetrahedrite' Cu 12 Sb 4 S 13 and its mixed Sb-Bi analogue, 85 CuSbSe 2 , 86,87 Cu 3 SbSe 3 , 87,89,90 and CuBiSe 2 . 96,97 Spark sintering of the elements has been used for Cu 3 SbSe 3 84 and Cu 3 SbSe 3 91 ; and.…”