ZnO pellets were densified with var

ZnO pellets were densified with varying molarities of Zn(OAc)2 aqueous solutions, ranging from 0.2 M to 1.2 M. A prior report by Kang et al. determined the optimized conditions for ZnO densification [12]. Samples were pressed at 530 MPa and 120°C for 30 minutes. The resulting densities and sintegrams are shown in Figure 1(a) and (b), respectively, with SEM images shown in Figure 2. Sintegrams in Figure 1(b) are represented as percent compaction, where each compaction trace is normalized and then scaled according to its final density. This method accounts for minute differences in the initial compaction events (e.g. before compaction is recorded) that cause variations in the total compaction amount for samples of identical density. Later sintegrams are also represented this way for consistency.