Defect model and spin-Hamiltonian parameters for the tetragonal Nd3+ center in the tetragonal phase of SrTiO3 crystal

Structural phase transition and microwave dielectric properties of Ca1−x Sr x TiO3 (x = 0.1–0.9) ceramics

“…The creation of these vacancies leads to doubling of the unit cell which results in structural distortion [8]. Similarly, SrTiO 3 (a man-made perovskite material) has attracted increased research interest due to its applications in luminescence and data storage devices, and as an anode material in fuel cells [9]. SrTiO 3 has a cubic (Pm " 3m) structure with lattice constant a = 3.905 Å at room temperature [10,11] and e r = 300, Q 9 f = 3,300 and a high s f = 1,650 [7].…”

Spin-Hamiltonian parameters and defect structures for the trigonal Yb3+centers in wurtzite-type ZnS and CdS crystals

“…On the basis of studies with the superposition model for the crystal-field parameters B kq in optical and EPR spectra of various rare-earth ions in a number of crystals, an empirical rule that the intrinsic parameters Ā2 (R 0 ) > Ā4 (R 0 ) > Ā6 (R 0 ) was found [25][26][27][28][31][32][33][34][35]. The intrinsic parameters obtained in ZnS : Yb 3+ and CdS : Yb 3+ obey the rule.…”

Defect models of two tetragonal Ce3+ centers T1 and T2 in Ce3+-doped cubic fluorperovskites KMgF3 and BaLiF3

“…The intrinsic parameters A k ðR0Þ in superposition model are taken as the adjustable parameters because they depend upon the nature of metal-ligand cluster. From a lot of studies on the optical and EPR spectra (which are connected with the crystal field parameters) for 4f n ions in crystals, it is found that for different 4f n ions in the same or similar crystals and clusters, the intrinsic parameters A k ðR0Þ are near [27,[38][39][40][41][42] (in particular, see Table 1 in [41], Table 2 in [40,42] and Table 4 in [38]). The parameters A k ðR0Þ for 4f 1 (CeF 12 ) 9À tetrakaidecahedral clusters in crystals have not been reported until now.…”