Figure 6.
SEM images of (a) OPC40 at 20 °C; (b) OPC40 at 500 °C; (c) OPC40 at 1200 °C; (d) GEO40 at 20 °C; (e) GEO40 at 500 °C; (f) GEO40 at 1200 °C.
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