Studies of the spin-Hamiltonian parameters and defect structures for Gd3+ ions in zircon-structure silicates MSiO4 (M=Zr, Hf, Th)

2011 ◽  
Vol 79 (5) ◽  
pp. 1291-1294 ◽  
Author(s):  
Wei-Qing Yang ◽  
Wen-Chen Zheng
Keyword(s):  
Defect Structures ◽  
Spin Hamiltonian ◽  
Zircon Structure ◽  
Hamiltonian Parameters

Studies of the spin Hamiltonian parameters and defect structures for Ag2+ in NaF and CsCdF3 crystals

2016 ◽  
Vol 484 ◽  
pp. 36-41 ◽  
Author(s):  
Li-Juan Zhang ◽  
Shao-Yi Wu ◽  
Chang-Chun Ding ◽  
Xian-Fen Hu ◽  
Jia-Jun He
Keyword(s):  
Defect Structures ◽  
Spin Hamiltonian ◽  
Hamiltonian Parameters

Theoretical studies of the defect structures and the spin Hamiltonian parameters for the Pd+ and Pd3+ centers in NH4Cl

2013 ◽  
Vol 1022 ◽  
pp. 45-49 ◽  
Author(s):  
Min-Quan Kuang ◽  
Shao-Yi Wu ◽  
Xian-Fen Hu ◽  
Zhi-Hong Zhang ◽  
Hua-Ming Zhang ◽  
...  
Keyword(s):  
Theoretical Studies ◽  
Defect Structures ◽  
Spin Hamiltonian ◽  
Hamiltonian Parameters

INVESTIGATION OF THE DEFECT STRUCTURE, OPTICAL AND EPR SPECTRA FOR CdS: Ti2+ AND CdSe: Ti2+ CRYSTAL

2009 ◽  
Vol 23 (27) ◽  
pp. 5325-5331 ◽  
Author(s):  
WEN-LIN FENG ◽  
WEN-CHEN ZHENG
Keyword(s):  
Defect Structure ◽  
Spectral Band ◽  
Zero Field ◽  
Spin Orbit ◽  
Defect Structures ◽  
Spin Hamiltonian ◽  
Zero Field Splitting ◽  
Orbit Parameter ◽  
Crystal Field Parameters ◽  
Hamiltonian Parameters

The optical spectral band positions and spin-Hamiltonian parameters (g factors g‖, g⊥ and zero-field splitting D) of CdS : Ti 2+ and CdSe : Ti 2+ crystals are calculated from the complete diagonalizaion (of energy matrix) method based on a two-spin-orbit parameter model for 3d2 ions in trigonal symmetry. In the model, both the contribution to spin-Hamiltonian parameters due to the spin-orbit parameter of central 3d2 ions and that of ligand ions are included. The crystal field parameters used in the calculations are obtained from the superposition model which enables correlation of the optical and EPR spectral data with the defect structure of the studied paramagnetic impurity centers in crystals. From the calculations, the defect structures of Ti 2+ centers in CdS : Ti 2+ and CdSe : Ti 2+ are acquired, the signs of zero-field splittings D are suggested, and the optical band positions and spin-Hamiltonian parameters are explained. The results are discussed.

EPR Studies of Tb 4+ in Single Crystals of Zircon and Scheelite Structure Silicates and Germanates

1996 ◽  
Vol 51 (8) ◽  
pp. 885-894 ◽  
Author(s):  
S. Hansen ◽  
B. D. Mosel ◽  
W. Müller-Warmuth ◽  
P. E. Fielding
Keyword(s):  
Magnetic Field ◽  
Zero Field ◽  
Scheelite Structure ◽  
Spin Hamiltonian ◽  
Field Limit ◽  
Paramagnetic Resonance ◽  
Zircon Structure ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract Electron paramagnetic resonance spectra of tetravalent terbium ions have been observed in host crystals of ZrSiO4 , HfSiO4 , ThSiO4 , ThGeO4 (zircon structure) and ZrGeO4 , HfGeO4 (scheelite structure) at X band and Q band and various temperatures. The spin Hamiltonian parameters have been determined from the rotational diagrams; the zero field splittings turned out to be extremely large, so that complex spectra far from the strong magnetic field limit had to be analyzed. In all the compounds Tb4+ substitutes for the tetragonal metal lattice sites. The incorporation of terbium, the origin of the large second-order parameters and comparisons with the spectra of trivalent gadolinium in similar systems are discussed.

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