ELECTRON PARAMAGNETIC RESONANCE OF MANGANESE IN CESIUM AND AMMONIUM CHLORIDES

1967 ◽  
Vol 45 (10) ◽  
pp. 3381-3386 ◽  
Author(s):  
A. Forman ◽  
J. A. Van Wyk
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Line Width ◽  
Structure Parameter ◽  
Manganese Ions ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

The spin-Hamiltonian parameters describing the EPR spectrum of Mn2+ in CsCl crystals grown from solutilon have been determined. The line-width data are in agreement with the manganese ions being incorporated interstitially rather than substitutionally for Cs+ ions. From the work on Mn2+ in NH4Cl we infer that the fine structure parameter, D2, is negative.

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 of magnetic clusters in Pb1−xGdxTe

1987 ◽  
Vol 65 (8) ◽  
pp. 1023-1026 ◽  
Author(s):  
M. Bartkowski ◽  
D. J. Northcott ◽  
J. M. Park ◽  
A. H. Reddoch ◽  
D. F. Williams ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Line Width ◽  
Quantum Interference ◽  
Ac Susceptibility ◽  
Magnetic Clusters ◽  
Paramagnetic Resonance ◽  
Weiss Temperature ◽  
Sample Rotation ◽  
Electron Paramagnetic

Measurements of electron paramagnetic resonance (EPR) and of susceptibility with a superconducting quantum interference device (SQUID) have been performed on Pb0.995Gd0.005Te crystals from 4.2 to 300 K. The EPR spectra consist of two components, one showing the fine structure of Gd3+ ions in a cubic environment and the other a broad line, which we attribute to clusters of interacting Gd ions. The resonant field of the cluster line is almost isotropic under sample rotation in the [Formula: see text] crystallographic plane, while the line width varies by a factor of 2.5 between [100] and 30° from it. This result suggests that an exchange-narrowing mechanism is responsible for the cluster line. The ratio of cluster-line intensity to fine-structure intensity increases with decreasing temperature down to 10 K and then decreases. This decrease may be related to the spin freeze-out seen in ac susceptibility. The line-width broadening of the cluster and the single-ion lines are similar below 20 K, with a higher rate for the cluster line. The Curie–Weiss temperature is negative and small for both clustered and single spins, reflecting a weak antiferromagnetic interaction.

Epr of Mn2+ in Ni(CH3COO)2 4H2O and K2 Ni(SO4)2 6H2O

1980 ◽  
Vol 3 ◽  
Author(s):  
Sushil K. Misra ◽  
M. Jalochowski
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Properties ◽  
Transition Temperature ◽  
Single Crystals ◽  
Liquid Helium ◽  
Liquid Nitrogen ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

ABSTRACTThe technique of electron paramagnetic resonance has been applied to study the magnetic properties of nickel acetate and nickel potassium tutton salt single crystals, using Mn2+ ion as probe. From the values of spin Hamiltonian parameters and linewidths at room, liquid nitrogen and liquid helium temperatures it is concluded that these crystals do not become magnetically ordered as the temperature is lowered to 3.2K, and thus the transition temperature, below which the crystal would order either ferromagnetically, or antiferromagnetically, for these crystals, should be below 3.2K.

EPR Studies of VO2+ in Ba(ClO4) 2 ・3H2O Single Crystals

1997 ◽  
Vol 52 (12) ◽  
pp. 849-854 ◽  
Author(s):  
Metin Yavuz ◽  
Hüseyin Kalkan ◽  
Ahmet Bulut ◽  
Şehriman Atalay ◽  
Emin Öztekin
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystal ◽  
Single Crystals ◽  
Axial Symmetry ◽  
Powder Sample ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Vanadyl Ion ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

The results of an electron paramagnetic resonance (EPR) study of vanadyl ion VO2+ doped in single crystals of Ba(ClO4)2 - 3 H2O are reported. The spectra indicated the presence of two substitutional and interstitial sites depending on the orientation. The spin-Hamiltonian parameters were determined from single crystal and powder EPR data. These parameters were found to be axial symmetric for the powder sample, whereas they showed deviations from axial symmetry for the single crystal

EPR Spectra of Some Cu2+-Doped Metal Carbonates and Disorder Phase Transition in K3H(CO3)2

2009 ◽  
Vol 64 (1-2) ◽  
pp. 123-126 ◽  
Author(s):  
Dilek Demir ◽  
Fevzi Köksal ◽  
Canan Kazak ◽  
Rahmi Köseoğlu
Keyword(s):  
Phase Transition ◽  
Low Temperatures ◽  
The Other ◽  
Spin Hamiltonian ◽  
Epr Spectrum ◽  
Paramagnetic Resonance ◽  
Disorder Phase Transition ◽  
Metal Carbonates ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Cu2+-doped K3H(CO3)2, Rb2CO3, and Rb2KH(CO3)2 single crystals were investigated by electron paramagnetic resonance (EPR) spectroscopy. The EPR spectrum of K3H(CO3)2 indicates two different sites for Cu2+ at room and at low temperatures. But the signals for the two sites overlap at 318 K which is attributed to a disorder phase transition. Each of the other compounds exhibits one site. The Cu2+ ion seems to substitute the K+ and Rb+ ions and the charge compensations are fulfilled by the proton vacancies in K3H(CO3)2, and another K+ and Rb+ in the other compounds. The spin Hamiltonian parameters g and A for each compound are determined and discussed.

Electron paramagnetic resonance studies on copper(II) benzoate

1969 ◽  
Vol 47 (4) ◽  
pp. 555-557 ◽  
Author(s):  
F. G. Herring ◽  
R. C. Thompson ◽  
C. F. Schwerdtfeger
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Magnetic Susceptibility ◽  
Polycrystalline Copper ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Binuclear Molecule ◽  
G Value ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

An electron paramagnetic resonance (e.p.r.) study at 9.1 and 12.0 GHz on polycrystalline copper(II) benzoate has given the following Spin Hamiltonian parameters for the binuclear molecule: D = 0.3311 ± 0.0006 cm−1, E = 0.0147 ± 0.0003 cm−1, gx = 2.048 ± 0.004, gy = 2.074 ± 0.004, gz = 2.345 ± 0.004. Using the average g value of 2.160 ± 0.004 obtained from e.p.r. and previously published magnetic susceptibility studies, 2J is estimated to be 333 cm−1.

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