Raman Spectra and Photoluminescence of Yttrium-Doped Thorium Dioxide Captions

A single-phase sample of yttrium doped thoria with FCC structure, was studied on a Raman spectrometer with a wavelength of 532 nm. Both Stokes and anti-Stokes shooting modes were used. The latter, despite the objective difficulties of its use, makes it possible to fundamentally remove the photoluminescence lines of material's own defects from consideration. Comparing the results of the two methods makes it possible to reliably identify precisely the structural lines among the entire data stream from the Raman spectrometer. It has been shown for the first time that the intense fluorite structure line is actually a triplet, the appearance of which, based on comparison with the literature data for similar systems, reflects an increased concentration of oxygen vacancies.