scholarly journals Electron paramagnetic resonance and photoluminescence investigation of europium local structure in oxyfluoride glass ceramics containing SrF2 nanocrystals

2017 ◽  
Vol 72 ◽  
pp. 749-755 ◽  
Author(s):  
A. Antuzevics ◽  
M. Kemere ◽  
G. Krieke ◽  
R. Ignatans
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Local Structure ◽  
Glass Ceramics ◽  
Oxyfluoride Glass ◽  
Paramagnetic Resonance ◽  
Electron Paramagnetic

scholarly journals Epr Hyperfine Structure Of Radiation Defect In Oxyfluoride Glass Ceramics/ Radiācijas Defekta Epr Hipersīkstruktūra Oksifluorīdu Stikla Keramikā

2012 ◽  
Vol 49 (6-I) ◽  
pp. 55-59
Author(s):  
D. Bērziņš ◽  
A. Fedotovs ◽  
U. Rogulis
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Hyperfine Structure ◽  
Radiation Defect ◽  
Glass Ceramics ◽  
Structure Characteristic ◽  
X Rays ◽  
Oxyfluoride Glass ◽  
Paramagnetic Resonance ◽  
Fluoride Crystals ◽  
Electron Paramagnetic

Abstract We have investigated the samples of thermally treated oxyfluoride glass ceramics 50SiO2-25LiO2-20YF3-3ErF3-2YbF2 by means of electron paramagnetic resonance (EPR) techniques. After irradiation of the samples with X-rays, in the EPR spectra a hyperfine structure characteristic of F-centres could be observed in different fluoride crystals. The structure of F-centre in the oxyfluoride glass ceramics containing LiYF4 crystallites is discussed.

Investigations of the EPR g factors for tetragonal copper site in Sr2Ca2Cu3Ox

2015 ◽  
Vol 29 (25n26) ◽  
pp. 1542011
Author(s):  
Hui-Ning Dong ◽  
Xu-Sheng Liu ◽  
Hong-Fei Zhou
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Local Structure ◽  
Cluster Approach ◽  
Paramagnetic Resonance ◽  
Orbital Hybridization ◽  
Copper Site ◽  
Electron Paramagnetic ◽  
G Factors

The electron paramagnetic resonance (EPR) [Formula: see text] factors are quantitatively investigated for tetragonal [Formula: see text] site in [Formula: see text] by utilizing the perturbation formulas of the [Formula: see text] factors for a tetragonally elongated octahedral [Formula: see text] cluster from the cluster approach. The anisotropy of the [Formula: see text] factors is discussed from the local tetragonal elongation of this five-fold coordinated copper site. The present EPR analysis for this precursor of Hg-1223 superconductors can be useful to the understandings of the relationships between the local structure (significant elongation of the copper site) and the intense Cu–O orbital hybridization and hence the high [Formula: see text] of the Hg-1223 systems.

LOCAL STRUCTURE CHARACTERIZATION OF GADOLINIUM DOPED AMORPHOUS AND CRYSTALLINE ALUMINA

2001 ◽  
Vol 15 (12n13) ◽  
pp. 375-384 ◽  
Author(s):  
S. SIMON
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Local Structure ◽  
Sol Gel ◽  
Structure Characterization ◽  
Epr Spectra ◽  
Paramagnetic Resonance ◽  
Amorphous Alumina ◽  
Electron Paramagnetic ◽  
Crystalline Alumina

The evolution of local structure during the transition from amorphous to crystalline states of gadolinium doped alumina is characterized by electron paramagnetic resonance (EPR). The EPR spectra of samples belonging to the (1 - x) Al 2 O 3x Gd 2 O 3 system, where x = 0.002, 0.01, 0.05 and 0.1, show that the gadolinium ions are relatively uniformly distributed in amorphous alumina granules prepared by sol–gel methods. First, gadolinium doped α-alumina appears on the surface of the γ-alumina granules where there are low coordinated (N < 6) gadolinium species. The transition from γ- to α-alumina is postponed by the presence of high coordinated gadolinium (N < 6) ions inside of γ-alumina granules.

Electron Paramagnetic Resonance Studies of Impurity Defects in PbTiO3

1997 ◽  
Vol 51 (1) ◽  
pp. 117-122 ◽  
Author(s):  
D. J. Keeble ◽  
E. H. Poindexter ◽  
G. J. Gerardi
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Fine Structure ◽  
Low Temperature ◽  
Local Structure ◽  
Metal Ion ◽  
Near Neighbor ◽  
Paramagnetic Resonance ◽  
Impurity Defects ◽  
Electron Paramagnetic

Electron paramagnetic resonance studies of metal ion impurities in the perovskite titan ate PbTiO3 are presented. Results for Pt+3, Mn+4, and Cu+2 are given, and near-neighbor superhyper fine structure (shfs) splittings for the first Pb shell are reported for these ions at low temperature. The relation between the shfs and the local structure of the ion is discussed.

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