Abstract
Single crystals of BaWO4, BaWO4: 0.5 at. % Ce; BaWO4: 1 at. % Ce; BaWO4: 0.5 at. % Ce, 1 at. % Na; and BaWO4: 1 at. % Ce, 2 at. % Na were grown from an inductively heated iridium crucible by the Czochralski method on a Malvern MSR4 puller. They were investigated using Electron Paramagnetic Resonance (EPR) spectroscopy at helium temperatures. One isolated center of high (D2d or S4) symmetry was found and two or more other centers of lower symmetry were identified, depending on crystal doping. From the fitting using the EPR-NMR program, the following parameters of g-matrix for the high symmetry center were found: gx = 1.505, gy = 1.505, and gz = 2.731. The linewidth vs. temperature revealed an increasing exponential tendency with increasing temperature. It showed one phonon at the lower temperatures and a Raman + Orbach effect at the higher temperatures. Radioluminescence and pulse height spectra showed rather poor scintillation properties, without any contribution from cerium emission.
Highlights
Barium tungstate (BaWO4 ) crystals are an interesting and relatively new medium for stimulatedRaman scattering for applications in Raman shifters of laser radiation [1]
Diffractograms of the analyzed BaWO4 single crystals doped with cerium and co-doped
A more detailed analysis of the Electron Paramagnetic Resonance (EPR) properties of BaWO4 single crystals doped with cerium ions is presented in [17]
Summary
Barium tungstate (BaWO4 ) crystals are an interesting and relatively new medium for stimulated. Oliveira et al. Good quality BaWO4 crystals can be grown by the Czochralski technique and doped with rare-earth investigated the photoluminescence spectrum in BaWO4 crystals centered at about 522 nm. Good quality BaWO4 crystals can be grown by the Czochralski technique and doped with rare-earth investigated the photoluminescence spectrum in BaWO4 crystals centered at about 522 nm They ions [9,10,11]. The absorption and emission spectra of the crystals were investigated emission was reported from BaWO4: Sm3+ phosphors by Shi et al [8]. Good quality BaWO4 crystals can be grown by the Czochralski technique and doped with rarethat peaked at 320 nm and 285 nm, being associated with lowest energy 4f-5d transitions.
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