Fig. 11: The SEM images and EDS maps of (Sc0.2Lu0.2Yb0.2Y0.2Gd0.2)PO4 after steam corrosion.

SEM images taken at the top surface of the (Sc0.2Lu0.2Yb0.2Y0.2Gd0.2)PO4 sample post vapor corrosion at 1400 °C for 60 h: a low magnification and b a higher magnification image of the corroded region (the inset is a SEM image of pristine surface). SEM images of the cross-section of the coupon post vapor corrosion: c a low magnification and d a high magnification.