Electron paramagnetic resonance study of Mn2+ doped Mg(ClO4)2∙6H2O

1978 ◽  
Vol 56 (9) ◽  
pp. 1175-1181 ◽  
Author(s):  
R. Dayal ◽  
D. Ramachandra Rao ◽  
Putcha Venkateswarlu
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Room Temperature ◽  
Structural Phase ◽  
Electron Paramagnetic Resonance Study ◽  
Liquid Nitrogen Temperature ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Principal Axes ◽  
The One ◽  
Electron Paramagnetic

Electron paramagnetic resonance of Mn2+ doped Mg(ClO4)2∙6H2O crystals has been studied from room temperature (300 K) down to liquid nitrogen temperature at X-band. The room temperature results show three inequivalent sites for Mn2+ in the crystal. Hyperfine forbidden transitions are observed when the magnetic field is not oriented along one of the principal axes. Two structural phase transitions have been observed at temperatures of 272 ± 1 and 103 ± 1 K, respectively. The transition occurring at 272 ± 1 K has been observed for the first time. The transition occurring at 103 ± 1 K is the one detected earlier through Mössbauer studies.

Electron Paramagnetic Resonance Study of Ion-Implanted Photorefractive Crystals

1997 ◽  
Vol 504 ◽  
Author(s):  
A. Darwish ◽  
D. Ila ◽  
E. K. Willams ◽  
D. B. Poker ◽  
D. K. Hensley
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Ion Implantation ◽  
Room Temperature ◽  
Electron Paramagnetic Resonance Study ◽  
Paramagnetic Resonance ◽  
Photorefractive Crystals ◽  
Laser Illumination ◽  
Epr Signal ◽  
Electron Paramagnetic

ABSTRACTThe effect of the ion implantation (Fe) on LiNbO3, MgO, and A12O3 crystals is studied using electron paramagnetic resonance (EPR). EPR measurements on these crystals were performed as a function of fluence at room temperature. The fluence was 1 × 1014 and 1 × 1016 ions/cm2. The unpaired carrier concentration increases with increasing fluence. The photosensitivity of these crystals was determined by observing in situ the effect of the laser illumination on the EPR signal and measuring the decay and the growth of the EPR signal. The EPR signal of Fe3+ was found to decrease in both MgO, and Al2O3; and was found to increase in LiNbO3. This indicated that in case of MgO, and A12O3 Fe3+ will transfer into Fe2+/Fe4+, but in case of LiNbO3 Fe2+/ Fe4+ will transfer into Fe3+; increasing the EPR signal. This was found primary due to some Fe2+ and Fe4+ ions, which is not intentionally doped on the LiNbO3 crystal but exist as a defect on the crystal.

EPR Studies of Mn2+-Doped Diammonium Hexaaqua Magnesium(II) Sulfate

2006 ◽  
Vol 61 (12) ◽  
pp. 683-687 ◽  
Author(s):  
Ram Kripal ◽  
Ashutosh Kumar Shukla
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Single Crystals ◽  
Room Temperature ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Electron paramagnetic resonance (EPR) studies of Mn2+ impurity in single crystals of diammonium hexaaqua magnesium(II) sulfate have been carried out at 9.3 GHz (X-band) at room temperature. The EPR spectra exhibit a group of five fine structure transitions. The spin-Hamiltonian parameters were determined. Mn2+ enters the lattice interstitially. The EPR spectrum of a powder sample supports the data obtained by single crystal studies. - PACS number: 76.30

Electron Paramagnetic Resonance Study of some Alkyl Substituted Cycloalkenyl Radicals

1971 ◽  
Vol 49 (1) ◽  
pp. 20-27 ◽  
Author(s):  
D. R. Gee ◽  
J. K. S. Wan
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Spin Resonance ◽  
Electron Spin ◽  
Room Temperature ◽  
Electron Paramagnetic Resonance Study ◽  
Paramagnetic Resonance ◽  
Spin Resonance ◽  
Electron Paramagnetic

Well-resolved electron spin resonance (e.s.r.) spectra are reported and analyzed for the radicals produced when samples of solid adamantane doped with alkyl substituted cycloalkenes are γ-irradiated at room temperature.

Electron Paramagnetic Resonance Study of Cu 2+ in CdCa (CH3COO) 4 • 6H2O Single Crystal

2000 ◽  
Vol 55 (8) ◽  
pp. 729-732
Author(s):  
Hüsey in Kalkan ◽  
Ismet Senel
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystal ◽  
Room Temperature ◽  
Electron Paramagnetic Resonance Study ◽  
Temperature Dependent ◽  
Paramagnetic Resonance ◽  
Jahn Teller ◽  
Experimental Errors ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract The Electron Paramagnetic Resonance spectra of Cu 2+ in CdCa (CH3COO)4 • 6H2O (cadmium calcium tetraacetate hexahydrate) powder and single crystal have been recorded at 300 and 133 K. The angular variation of the spectra indicated the substitution of the host Cd 2+ with Cu 2+ . The observed values of the g and A hyperfine tensors were found to be temperature dependent, and this dependence is discussed and explained on the basis of dynamic Jahn-Teller effects. The spin-Hamiltonian parameters were found to be axial symmetric at room temperature, whereas they showed deviations from axial symmetry at low temperature. The g and A tensors where found to be coaxial within the limits of experimental errors, and the ground state wave functions of the complex at 300 and 133 K have been constructed.

Multi-Band Electron Paramagnetic Resonance Study of Microcrystalline and Cluster Silicon Embedded in SiO2

2000 ◽  
Vol 609 ◽  
Author(s):  
Takashi Ehara ◽  
Tadaaki Ikoma ◽  
Shozo Tero-Kubota
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Line Width ◽  
Electron Paramagnetic Resonance Study ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Band Electron ◽  
X Band ◽  
Epr Signal ◽  
Band Spectra ◽  
Electron Paramagnetic

ABSTRACTDangling bond defects (DB) in silicon microcrystallines and clusters embedded in SiO2 have been studied by X- and Q-band electron paramagnetic resonance (EPR) spectroscopy. The EPR spectra due to the DB were remarkably depending on the grain size, which was controlled by annealing temperature. The microcrystalline containing film shows a broad and unsymmetrical EPR signal at g = 2.006 with the line width of 13 G in X-band spectra. The signal can be simulated by using the anisotropic g-values of Pb center. The Si cluster samples obtained from the annealing at less than 800°C give an asymmetric EPR spectra at about g = 2.004 with the line width of about 9 G in X-band. The EPR signal due to the E' center was also observed.

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