Electron Paramagnetic Resonance of Cu2+ Doped Na2 HAsO4·7H2O Single Crystals

1998 ◽  
Vol 53 (9) ◽  
pp. 779-782
Author(s):  
F. Köksal ◽  
İ. Kartal ◽  
A. Gençten
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Ground State ◽  
Room Temperature ◽  
Charge Compensation ◽  
Distorted Octahedron ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract The electron paramagnetic resonance spectra of Cu2+ doped Na2HAsO4 ·7H2O single crystals were studied at room temperature. The results indicate the substitutional entrance of Cu2+ in two magnetically inequivalent Na+ sites. Charge compensation is supposed to be fulfilled by proton vacancies. The spin Hamiltonian parameters were determined. The ground state for Cu2+ seems to indicate the dominance of the dz² orbital and therefore a compression of the distorted octahedron along its C4v axis.

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 Cu2+ in KHC03 Single Crystals

1999 ◽  
Vol 54 (3-4) ◽  
pp. 177-179 ◽  
Author(s):  
F. Köksal ◽  
İ. Kartal ◽  
B. Karabulut
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Ground State ◽  
Room Temperature ◽  
Hyperfine Coupling ◽  
Charge Compensation ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

The electron paramagnetic resonance spectra of Cu2+ doped KHC03 single crystals were studied at room temperature. The results indicate a substitutional entrance of the Cu2+ ions in place of the magnetically inequivalent K+ sites. The charge compensation is supposed to be fulfilled by proton vacancies. The hyperfine lines were well resolved and the 65Cu hyperfine coupling tensors were also found. The ground state of Cu2+ indicates the dominance of the dx2-y2 orbital and, therefore, elongation of the polyhedron, similar to a lengthened octahedron.

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 Study of VO2+ Doped Diammonium Tricadmium Tetrakis (Sulfate) Pentahydrate [(NH4)2Cd3(SO4)4 ∙ 5H2O] Single Crystals

2010 ◽  
Vol 65 (4) ◽  
pp. 347-352 ◽  
Author(s):  
Ibrahim Kartal ◽  
Bünyamin Karabulut ◽  
Esat Bozkurt
Keyword(s):  
Single Crystals ◽  
Room Temperature ◽  
Epr Spectra ◽  
Spin Hamiltonian ◽  
Axially Symmetric ◽  
Paramagnetic Resonance ◽  
Sulfate Pentahydrate ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic ◽  
Very High

Electron paramagnetic resonance (EPR) studies are carried out on vanadyl (VO2+) ions in diammonium tricadmium tetrakis (sulfate) pentahydrate single crystals at room temperature. The EPR spectra of a single crystal exhibit resonance signals characteristic to VO2+ ions. The analysis of EPR spectra indicates that the VO2+ ions in single crystals show two magnetically inequivalent VO2+ sites in distinct orientations occupying substitutional positions in the lattice and showing very high angular dependence. They form in octahedral coordination with tetragonal compression with C4v symmetry. The spin Hamiltonian parameters are determined, and these parameters have been used to estimate the bonding coefficients of the VO2+ ion in a diammonium tricadmium tetrakis (sulfate) pentahydrate lattice. The parallel and perpendicular components of axially symmetric g and hyperfine (A) tensors are evaluated and the results are discussed and compared with previous reports.

Spin quenching and EPR of Mn2+ in K2Ni(SeO4)2∙6H2O single crystals

1983 ◽  
Vol 61 (9) ◽  
pp. 1359-1361 ◽  
Author(s):  
R. K. Malhotra ◽  
V. P. Seth ◽  
V. K. Jain
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Electron Paramagnetic Resonance Study ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Field Dependent ◽  
Line Widths ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

An electron paramagnetic resonance study of Mn2+ in K2Ni(SeO4)2∙6H2O single crystals has been made at 294 K and 9.45 GHz. The Mn2+ substitutes at Ni2+ sites in the lattice. The spin-Hamiltonian parameters are evaluated. The observations regarding the anisotropic and field dependent line widths of Mn2+ in the lattice are discussed using the spin-quenching concept.

EPR of VO2+ in ZnTiF6 · 6H2O

1996 ◽  
Vol 51 (4) ◽  
pp. 245-248
Author(s):  
Geetha Jayaram ◽  
V. G. Krishnan
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Tutton Salts ◽  
Bonding Parameters ◽  
Superhyperfine Structure ◽  
Vanadyl Ion ◽  
Electron Paramagnetic

Abstract Electron Paramagnetic Resonance (EPR) studies have been carried out on the vanadyl (VO2) ion doped in single crystals of ZnTiF6 • 6H2O. The spectra indicate the presence of one set of eight lines characteristic of only one occupation site. The V-O bond orientation is along one of the three Zn-H2O bond directions in the trigonally distorted [Zn(H2O)6] octahedra. This behaviour is unlike that reported for vanadyl ion substituting for the M(H2O)6 sites in the Tutton salts, alums and AlCl3 • 6H2O. The Spin-Hamiltonian and bonding parameters for the [VO(H2O)5] complex have been evaluated. The hyperfine linewidths are 0.8 mT at 300 K and 77 K. No proton superhyperfine structure was observed at both these temperatures.

Sign in / Sign up

Export Citation Format

Share Document