XRD patterns of YSZ:Eu powders prepared by atmospheric plasma spraying. The patterns of slow scan in the high degree range are shown in the inset and the peak profile was fitted by Gaussian function.
SEM images for the fractured cross sections of 8YSZ:Eu coating with different magnifications.
Luminescence spectra of the powder sample, excited by the 514.5 nm laser under increasing pressures: (a) the main peak of 5D0→7F2 transition of Eu3+ ions, (b) the variation of peak position with pressure.
Micro-photoluminescence spectrum of Eu3+ ions in YSZ:Eu sublayer in the TBC.
The measured residual stresses in the luminescence sublayer of TBC sample. The TBC sample is shown in the top right of the figure. Only twelve spots in a quarter of the sample (indicated by the thick grey line on the bottom) were chosen to measure the stresses. The height of the bar indicates the value of the stress in a spot measured by the laser.
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