Identification of trigonal rare earth centres in calcium fluoride using endor of 19F, 1H and 17O

Mössbauer Studies of Oxygen-StabilizedEu2+in CaF2Lambe1, Schroeer2 1976Phys. Rev. Lett.4350View full textAdd to dashboardCite

“…1 " 3 However, to stabilize Eu 2+ at concentrations of several percent in CaF 2 , techniques such as hydrolysis, or preparation in a hydrogen atmosphere, have been found necessary. Recent experiments have suggested that these preparation techniques in fact lead to the injection of oxygen into the calcium fluoride lattice, and indeed oxygen-compensated Gd 3+ complexes have been observed in CaF 2 by Reddy et ah 4 and by Kitts and Crawford. 5 We report here a Mossbauer study of divalent europium, stabilized in CaF 2 through analogous oxygeneuropium complexes.…”

“…and 3(d) are divalent analogs of the trivalent complexes identified as T x and T 2 , respectively, by Reddy et ah4 Possible configurations for the oxygenstabilized Eu 2+ complexes corresponding to the four activation energies discussed in the text,…”

EPR and optical spectroscopy of Yb3+ ions in CaF2: an analysis of the structure of tetragonal centers

“…Figure 1 also shows the structural scheme of the complexes determined by ENDOR [14]. I I I I I i t i t i i i i I i i I I I I I I , I , I ~ 2, 3, 5 and 6, where T~ is the trigonal PC formed under the transformation of the complex Ca2 § into yb3 § [16]. Interestingly, in spite of the fact that only T cand Tte t are observed in the EPR spectra, the optical spectra show the optical line assigned to the resonance transition T~.…”

Spectrometer for optical detection of magnetic resonance: Magneto-optical study of Yb3+ in BaF2 single crystal

“…It is known that depending on the conditions of crystal synthesis, the Yb 3 + ion in a fluorite single crystal (CaF2) forms up to ten paramagnetic centers with different symmetry [10][11][12][13][14][15][16][17][18][19][20]. Yb3 + ion in this matrix being extensively studied by EPR, ENDOR and optical spectroscopy (including Zeeman spectroscopy), considerable discrepancies in the interpretation of optical absorption and luminescence spectra of PCs still remain, and the Stark structures of these centers are not unambiguously identified.…”