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. 2015 Apr 22;8(4):1993–1999. doi: 10.3390/ma8041993

Figure 4.

Figure 4

SEM images and Etching Pit density (EPD) of (a) S3.00-GaN; (b) S0.41-GaN; (c) S0.60-GaN and (d) S0.87-GaN.