Growth and characterization of crack-free scheelite calcium molybdate single crystal fiber

Investigations of the EPR g Factors for Er3+ in CaMoO4

“…[with the reference bonding length R 0 ≈ 2.466Å, which is very close to the average metal-ligand distanceR(≈ 2.466Å) in the studied CaMoO 4 ] were obtained for Er 3+ in scheelite CaWO 4 . So, they are also adopted for the Er 3+ center in this work, except that we takeĀ 4 (R 0 ) ≈ 50.2 cm −1 and A 6 (R 0 ) ≈ 21.1 cm −1 here for CaMoO 4 in consideration of the small difference between the structural data for CaMoO 4 and CaWO 4 [21].…”

“…The observed axial g factors reveal the tetragonal symmetry of the Er 3+ center in CaMoO 4 . It is noted that there are two possible cases which would lower the local symmetry of the impurity center, i. e., vicinal charge compensation and off-center displacement of the impurity ion.…”

“…So, they are also adopted for the Er 3+ center in this work, except that we takeĀ 4 (R 0 ) ≈ 50.2 cm −1 and A 6 (R 0 ) ≈ 21.1 cm −1 here for CaMoO 4 in consideration of the small difference between the structural data for CaMoO 4 and CaWO 4 [21]. The free-ion parameters of the Coulombic repulsion (F 2 ≈ 97504 cm −1 , F 4 ≈ 70746 cm −1 and F 6 ≈ 48042 cm −1 ), the twobody interaction parameters (α ≈ 20.95 cm −1 , β ≈ −689 cm −1 and γ ≈ 1839 cm −1 ) and the spin-orbit coupling coefficient (ζ 4f ≈ 2339 cm −1 ) in the energy matrix were obtained for Er 3+ -doped CaWO 4 [27].…”

“…Recently, CaMoO 4 has attracted great interest because of its application in silica-supported catalysts [1], as dispersive element in electronically tunable lasers [2] and mixed electron-hole-ion conductor [3,4]. Particularly, this kind of compounds can be easily doped with rare earth ions and grown to large crystals which are the candidates of solid state laser materials [5,6].…”

“…In order to study the electronic energy transfer mechanisms among the rare earth ions as well as the effect of crystal-fields, temperature and pressure on the properties of these materials, extensive investigations have been carried out by means of high pressure Raman and X-ray excited luminescence spectroscopies [7 -9]. The electron paramagnetic resonance g factors for Er 3+ in CaMoO 4 were measured by EPR technique decades ago [10,11]. Until now, however, these experimental results have not been theoretically studied.…”