Hyperfine Interactions at Lanthanide Sites in Europium Doped Oxide Glasses

2000 ◽  
Vol 55 (5) ◽  
pp. 499-506 ◽  
Author(s):  
G. Concas ◽  
F. Congiu ◽  
G. Spano ◽  
A. Speghini ◽  
K. Gatterer ◽  
...  
Keyword(s):  
Isomer Shift ◽  
Line Width ◽  
Interaction Parameter ◽  
Hyperfine Interactions ◽  
Optical Basicity ◽  
Oxide Glasses ◽  
Borosilicate Glasses ◽  
Quadrupolar Interaction ◽  
The Eu ◽  
Doped Oxide

Abstract A series of europium doped Na2O-B2O3-SiO2, PbO-GeO2 and ZnOTeO2 glasses was investi-gated by means of151 Mössbauer spectroscopy. The distortion of the Eu sites has been evaluated in the Na2O-B2O3-SiO2 glasses by means of the quadrupolar interaction parameter and the asym-metry parameter; the disorder has been estimated by the line width. The occupancy of the sites in the borosilicate glasses is discussed. The correlation of the isomer shift with the optical basicity of the glass is discussed in terms of the degree of covalence of the Eu-O bond.

Optical properties of Ce3+-doped oxide glasses and correlations with optical basicity

2007 ◽  
Vol 42 (7) ◽  
pp. 1195-1200 ◽  
Author(s):  
Jiafang Bei ◽  
Gujie Qian ◽  
Xiaoluan Liang ◽  
Shuanglong Yuan ◽  
Yunxia Yang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Optical Basicity ◽  
Oxide Glasses ◽  
Doped Oxide

Local Structure of Europium Sites in Oxide Glasses by Nuclear Gamma Resonance

1999 ◽  
Vol 54 (8-9) ◽  
pp. 539-544 ◽  
Author(s):  
Giorgio Concas ◽  
Giorgio Spano ◽  
Marzia Carrada ◽  
Marco Bettinelli ◽  
Adolfo Speghini
Keyword(s):  
Asymmetry Parameter ◽  
Optical Basicity ◽  
Axial Component ◽  
Oxide Glasses ◽  
Cubic Symmetry ◽  
Nuclear Gamma Resonance ◽  
Covalent Component ◽  
Axis Of Symmetry ◽  
Fourfold Axis ◽  
The Eu

The symmetry and disorder of the Eu3+ site was investigated in some phosphate and borate glasses by means of 151Eu Mössbauer spectroscopy. The quadrupole interaction parameter, which is due to the distortion of the Eu site compared to a cubic symmetry, has been measured together with the asymmetry parameter, which points out the absence of a threefold or fourfold axis of symmetry at the rare earth site. The correlation of the isomer shift with the optical basicity of the glass indicates a covalent component with 6s character in the Eu-O bond. The axial component of the electric field gradient at the Eu site is also correlated with the optical basicity.

MÖSSBAUER EFFECT STUDY OF THE EU-Y-Ba-Cu-O SUPERCONDUCTOR

1987 ◽  
Vol 01 (02) ◽  
pp. 491-494
Author(s):  
Weiming Xu ◽  
Xiaoxiang Liu ◽  
Mingzhi Jin ◽  
Lanying He ◽  
Yifeng Wang ◽  
...  
Keyword(s):  
Isomer Shift ◽  
Mössbauer Effect ◽  
Single Phase ◽  
Hyperfine Interactions ◽  
Effect Study ◽  
X Ray Diffraction ◽  
Mossbauer Effect ◽  
X Ray ◽  
Zero Resistance ◽  
The Eu

In this work the hyperfine interactions of (EuxY1−x)0.3Ba0.1CuO3(x=0.5, 0.7, 1.0) superconductors have been studied by 151Eu Mössbauer effect. X-ray diffraction shows that the materials are of single phase. Mössbauer spectra were measured at 300K and 83K. The results show that Eu ions are in the trivalent oxidation state. The isomer shift decreases with the increasing of composition x. The electron density at the 151Eu nuclei is decreased below the zero resistance temperature.

Microsphere laser in Er3+-doped oxide glasses

2004 ◽  
Author(s):  
Carole Arnaud ◽  
M. Boustimi ◽  
Massimo Brenci ◽  
Patrice Feron ◽  
Maurizio Ferrari ◽  
...  
Keyword(s):  
Oxide Glasses ◽  
Doped Oxide

Hyperfine interactions at europium sites in oxide glasses

1996 ◽  
Vol 53 (10) ◽  
pp. 6197-6202 ◽  
Author(s):  
G. Concas ◽  
F. Congiu ◽  
C. Muntoni ◽  
M. Bettinelli ◽  
A. Speghini
Keyword(s):  
Hyperfine Interactions ◽  
Oxide Glasses

Mössbauer Spectroscopy as a Tool for Materials Research

MRS Bulletin ◽  
1986 ◽  
Vol 11 (6) ◽  
pp. 14-17 ◽  
Author(s):  
John G. Stevens
Keyword(s):  
Hyperfine Interaction ◽  
Isomer Shift ◽  
Quadrupole Splitting ◽  
Electron Density ◽  
Gamma Ray ◽  
Hyperfine Interactions ◽  
Structure Information ◽  
Resolution Capability ◽  
Materials Research ◽  
Mössbauer Parameters

In 1958 Rudolph L. Mössbauer reported his discovery of a simple, practical way of observing nuclear gamma ray resonance. One of the remarkable features of the discovery was the high precision with which energy changes can be measured: energy resolutions of one part to 1011 −1013 are possible. With this high resolution capability it is possible to measure hyperfine interactions between the nucleus of an atom and its electronic environment. These interactions affect the line shape which can be described by several experimental Mössbauer parameters. The three primary parameters are the isomer shift (δ), the quadrupole splitting (Δ), and the magnetic hyperfine interaction.The isomer shift, determined by the position of the centroid of a set of lines in a spectrum, is proportional to the electron density at the nucleus. Since only s electrons have a probability of being at the nucleus, it is possible to obtain electronic structure information such as oxidation state and population of certain molecular orbitals.The quadrupole splitting results when the electron environment surrounding the Mössbauer nucleus is not spherical in its charge distribution. Specifically, Δ is proportional to the imbalance in electron density between the axial and equatorial directions. When this hyperfine interaction is present, there is a quadrupole splitting; i.e., a single spectra line will split into two or more lines.

scholarly journals Deformation and cracking behavior of La2O3-doped oxide glasses with high Poisson's ratio

2018 ◽  
Vol 494 ◽  
pp. 86-93 ◽  
Author(s):  
Kacper Januchta ◽  
Ruofu Sun ◽  
Liping Huang ◽  
Michal Bockowski ◽  
Sylwester J. Rzoska ◽  
...  
Keyword(s):  
Poisson’S Ratio ◽  
Poisson's Ratio ◽  
Oxide Glasses ◽  
Cracking Behavior ◽  
Doped Oxide

Cationic ordering in oxide glasses: the example of transition elements

2000 ◽  
Vol 64 (3) ◽  
pp. 409-424 ◽  
Author(s):  
L. Galoisy ◽  
L. Cormier ◽  
S. Rossano ◽  
A. Ramos ◽  
G. Calas ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Structural Data ◽  
Spectroscopic Properties ◽  
Oxide Glasses ◽  
Borosilicate Glasses ◽  
Transition Elements ◽  
Coordination Numbers ◽  
Cationic Distribution ◽  
X Ray Absorption ◽  
Chemically Selective

AbstractStructural data have been obtained on the cation surroundings in multi-component silicate and borosilicate glasses using chemically selective spectroscopic and scattering methods, such as extended X-ray absorption and neutron scattering with isotope substitution (NSIS). Transition elements such as Ni or Ti may occur in unusual 5-coordinated sites which coexist with other coordination numbers, depending on glass composition. Distribution of cationic sites in the glassy structure is responsible for unusual spectroscopic properties, as shown by Fe2+ Mössbauer spectroscopy. The environment of cations such as Zn, Zr or Mo, has been determined by EXAFS and discussed using the bond valence theory, which predicts the way to charge compensate the oxygen neighbours and which indicates the linkage of cationic sites with the silicate framework. Cation-cation correlations are given by NSIS up to ∼8 Á, indicating an extensive Medium Range Ordering (MRO) with corner- and edge-linked cationic polyhedra, for Ti and Ni-bearing glasses, respectively. This heterogeneous cationic distribution in glasses is consistent with the presence of two-dimensional domains in which cation mixing may occur, as shown in a Ca-Ni metasilicate glass. Three-dimensional domains have also been found by Ni-K edge EXAFS in the case of low alkali borate glasses, with a local structure which mimics some aspects of crystalline NiO. The presence of ordered cationic domains, clearly illustrated by Reverse Monte Carlo simulations helps to rationalize the physical properties of multi-component silicate glasses.

Relation between the Ω6intensity parameter of Er3+ions and the151Eu isomer shift in oxide glasses

1993 ◽  
Vol 73 (12) ◽  
pp. 8451-8454 ◽  
Author(s):  
S. Tanabe ◽  
T. Ohyagi ◽  
S. Todoroki ◽  
T. Hanada ◽  
N. Soga
Keyword(s):  
Isomer Shift ◽  
Oxide Glasses
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