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. 2017 Mar 10;7:44144. doi: 10.1038/srep44144

Figure 2.

Figure 2

(a) SEM-micrograph of the immediate surface after crystallization for 5 h at 900 °C. Arrows highlight specific growth structures. More detailed growth structures of (b) β-YS, (c) δ-YS and (d) ε-YS are presented below.