Figure 2
Synthesis of WTe2 by (a) chemical vapor transport results in the formation of (b) large bulk crystals, accompanied by (c) smaller crystallites. X-ray powder diffraction (d) confirms that WTe2 crystallizes in space group Pmn21 in the Td structure. (e) XPS shows that Td-WTe2 is stoichiometric. Density functional theory (f) indicates that the enthalpy of formation of the Td-WTe2 phase is lower than that of the 2H phase, regardless of pressure, indicating it is the most stable form of bulk Td-WTe2.
