Host Spin-Lattice Relaxation Narrowing in Pr2Co3(NO3)12 · 24 H2O: Mn2+ \ Gd3+ Single Crystals

1980 ◽  
Vol 35 (12) ◽  
pp. 1308-1312 ◽  
Author(s):  
Vimal Kumar Jain
Keyword(s):  
Single Crystals ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Single Type ◽  
Spin Hamiltonian ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
X Band ◽  
Hamiltonian Parameters ◽  
Electron Paramagnetic

Abstract Electron paramagnetic resonance of Mn2+ and Gd3+ in single crystals of Pr2Co3(NO3)12 · 24 H2O has been studied at X-band at 305 and 77 K. Mn2+ substitutes at two types of Co2+ sites whereas Gd3 substitutes at the single type of Pr3+ site in the lattice. The spin-Hamiltonian parameters have been evaluated. Observation of resolved Mn2+ and Gd3+ spectra at 305 K and their broadening on lowering the temperature are discussed in terms of host spin-lattice relaxation narrowing.

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

The detection of phase transitions in NH4Sm(SO4)2∙4H2O single crystals using the electron paramagnetic resonance of Gd3+ impurity ions

1981 ◽  
Vol 59 (4) ◽  
pp. 596-604 ◽  
Author(s):  
H. A. Buckmaster ◽  
V. M. Malhotra ◽  
H. D. Bist
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Orthorhombic Symmetry ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Impurity Ions ◽  
Impurity Ion ◽  
Electron Paramagnetic

The 9.4 GHz electron paramagnetic resonance (epr) of Gd3+ impurity ions in NH4Sm(SO4)2∙4H2O single crystals has been studied at 101–297 K. The 294 K epr spectra show that the Gd3+ impurity ion substitutes for the Sm3+ host ion in two magnetically nonequivalent complexes corresponding to the tetramolecular unit cell. These spectra were analyzed using an orthorhombic symmetry spin-Hamiltonian. The observation of resolved Gd3+ impurity ion spectra in the presence of paramagnetic Sm3+ ions has been interpreted in terms of a random modulation of the interaction between the Gd3+ impurity and Sm3+ host ions by rapid spin–lattice relaxation of the Sm3+ ions. The spin–lattice relaxation time of the Sm3+ ions has been estimated at 294 K from the impurity ion epr linewidths and is found to be consistent with an Orbach resonance process. The value for τ1, has also been computed for Nd3+ ions in NH4Nd(SO4)2∙4H2O from the epr linewidth data in the literature. It has been shown for the first time that NH4Sm(SO4)2∙4H2O single crystals have the phase transition sequence[Formula: see text]

The use of the electron paramagnetic resonance of Gd3+ impurity ions and infrared spectra to study the phase transitions in NH4Ce(SO4)2∙4H2O single crystals

1980 ◽  
Vol 58 (12) ◽  
pp. 1667-1676 ◽  
Author(s):  
V. M. Malhotra ◽  
H. A. Buckmaster ◽  
H. D. Bist
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Single Crystals ◽  
Infrared Spectra ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Paramagnetic Resonance ◽  
Spin Lattice ◽  
Impurity Ions ◽  
Impurity Ion ◽  
Electron Paramagnetic

The 9.4 GHz electron paramagnetic resonance (epr) of Gd3+ impurity ions in NH4Ce(SO4)2∙4H2O single crystals has been studied at 97–304 K. The Gd3+ impurity ion is found to substitute for the trivalent lanthanide ion in two inequivalent magnetic complexes corresponding to the tetramolecular unit cell. The epr spectra at 304 K have been analyzed using an orthorhombic symmetry spin-Hamiltonian. The observation of resolved Gd3+ impurity ion spectra in the presence of paramagnetic Ce3+ ions has been interpreted in terms of a random modulation of the interaction between the Gd3+ impurity and Ce3+ host ions by rapid spin–lattice relaxation of Ce3+ ions. The 304 K spin–lattice relaxation time of the Ce3+ ions has been estimated from the impurity ion epr linewidths and is found to be consistent with an Orbach process. It has been shown for the first time that NH4Ce(SO4)2∙4H2O single crystals have a phase transition sequence[Formula: see text]The infrared spectra of NH4Ce(SO4)2∙4H2O were studied at 120 and 303 K and the results are reported.

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.

Saturation Behaviour of Superhyperfine Structure of Mn2+ in PbTe

1986 ◽  
Vol 89 ◽  
Author(s):  
A. H. Reddoch ◽  
M. Bartkowski ◽  
D. J. Northcott
Keyword(s):  
Relaxation Time ◽  
Single Crystals ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice ◽  
Superhyperfine Structure ◽  
X Band ◽  
Structure Line ◽  
Conventional Models

AbstractX-band EPR measurements have been made on single crystals and powders of PbTe doped with Mn below 100 ppm. A seven-fold splitting of each Mn hyperfine structure line is shown to arise from tellurium superhyperfine structure. Microwave saturation results are presented which indicate that the spin-lattice relaxation time is different for different superhyperfine lines. This asymmetry is not readily explained by conventional models.

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.

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