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EXAFS FT. (a) Fits on the EXAFS FT for the two selected samples: Yb:RTP and Yb:Nb:RTP (doubled spectrum at the top). (b) FT of the EXAFS spectra for different samples codoped with Nb and not. In the region emphasized by the rectangle, all Nb-containing samples show a peak, while Nb-free samples show just a shoulder.
Ionic conductivity of RTP, Nb:RTP, Yb:RTP, and Yb:Nb:RTP crystals.
Optical spectroscopy of Yb:RTP and Yb:Nb:RTP samples. (a) Polarized optical absorption of in the two crystals recorded at 6 K. (b) Fluorescence of in Yb:RTP and Yb:Nb:RTP crystals recorded at 10 K after excitation at 902.2 nm. [ identifies the peaks related to located in Ti(1) site].
Selection of the most important structural parameters extracted from the fits of EXAFS data: Yb–O first shell interatomic distance [, ], Yb–O first shell Debye–Waller factor , Yb–Ti third shell interatomic distance , Yb–Nb third shell distance , and Yb–Ti third shell Debye–Waller factor .
Experimental Stark energy sublevels of the doping ion observed in Yb:RTP and Yb:Nb:RTP hosts. The energy of the different sublevels is given in .
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