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图3 (Y1/4Ho1/4Er1/4Yb1/4)2SiO5/Yb2Si2O7/Si和Yb2SiO5/Yb2Si2O7/Si涂层退火态与热循环后的SEM整体截面形貌及纵向裂纹放大形貌
Fig.3 Cross-section SEM images of (Y1/4Ho1/4Er1/4Yb1/4)2SiO5/Yb2Si2O7/Si (a, c, e, f) and Yb2SiO5/Yb2Si2O7/Si (b, d, g, h) coatings after annealing (a, b) and thermal cycling for 300 cyc (c, e, f) and 83 cyc (d, g, h) (White arrows in Fig.2c indicate the locations of vertical cracks in top layer)