For consistency, sintering experiments using a solid Zn(OAc)2·2H2O transport phase were formulated such that the molar ratio of zinc atoms in the transport phase (Zn*) to ZnO powder (Zn) mimicked the ratio for sintering experiments with aqueous solutions. Table 2 shows comparisons between aqueous solution molarity, transport phase to oxide powder Zn ratios, and added transport phase in weight percent.