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Lattice location and short range ordering of doping ions in
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Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

Ionic conductivity of RTP, Nb:RTP, Yb:RTP, and Yb:Nb:RTP crystals.

Image of FIG. 3.
FIG. 3.

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].


Generic image for table
Table I.

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 .

Generic image for table
Table II.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Lattice location and short range ordering of doping ions in RbTiOPO4