Electric-field gradients at the Zr sites inZr3Fe: Measured using perturbed-angular-correlation spectroscopy and calculated using band theory

2001 ◽  
Vol 65 (1) ◽  
Author(s):  
Arthur T. Motta ◽  
Stephen E. Cumblidge ◽  
Gary L. Catchen ◽  
Sergio B. Legoas ◽  
Andrea Paesano ◽  
...  
Keyword(s):  
Electric Field ◽  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Electric Field Gradients ◽  
Band Theory ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Field Gradients

Zirconia Characterization by Perturbed Angular Correlation Spectroscopy

1986 ◽  
Vol 73 ◽  
Author(s):  
Herbert Jaeger ◽  
John A. Gardner ◽  
Ohn C. Haygarth ◽  
Robert L. Rasera
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Simple Point ◽  
Stabilized Zirconia ◽  
Electric Field Gradients ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Field Gradients ◽  
Pure Zirconia ◽  
Cation Sites

ABSTRACTPerturbed Angular Correlation spectroscopy of 181Ta nuclei occupying cation sites has been used to investigate microscopic structural properties of several pure and stabilized zirconia materials. The PAC spectra are used to derive the electric field gradients at the tracer nucleus. Thse are compared with calculations based on a simple point-ion model. Agreement between experiment and theory is good for stabilized material and qualitatively reasonable for pure zirconia.

Perturbed -Angular -Correlation Spectroscopy on Indium- and Cadmium- Complexes in Silicon Carbide

1994 ◽  
Vol 339 ◽  
Author(s):  
J. Meier ◽  
D. Forkel-Wirth ◽  
T. Licht ◽  
U. Reislöhner ◽  
M. Uhrmacher ◽  
...  
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Spectroscopy ◽  
Axially Symmetric ◽  
Pac Spectroscopy ◽  
Electric Field Gradients ◽  
Cadmium Complexes ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Nitrogen Doped ◽  
Field Gradients

ABSTRACTComplex formation at indium and cadmium impurities implanted into samples of 3C-, 4H-and 6H- SiC was investigated by means of Perturbed Angular Correlation (PAC)-Spectroscopy. After annealing at 1600 K up to five different configurations characterized by their specific electric field gradients (EFG(i)) were observed in 6H- SiC, only four complexes in 4H- SiC; in the 3C- modification no complex was observed. All EFG's are axially symmetric and are oriented along the c- axis of the crystal. In a highly nitrogen doped 6H- SiC epi- layer an new EFG was observed. It is tentatively assigned to a close indium- nitrogen pair.

scholarly journals Perturbed Angular Correlation Studies in SrTiO3 Single Crystals

2000 ◽  
Vol 55 (1-2) ◽  
pp. 237-241
Author(s):  
P. de la Presa ◽  
K. P. Lieb ◽  
M. Uhrmacher ◽  
L. Ziegeler
Keyword(s):  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Hyperfine Interactions ◽  
Correlation Spectroscopy ◽  
Quadrupole Frequency ◽  
Perturbed Angular Correlation Spectroscopy ◽  
Temperature Range ◽  
Field Gradients ◽  
Electronic Defects ◽  
Asymmetry Parameters

The quadrupole hyperfine interactions of 111Cd/111 In probe nuclei in single-crystalline SrTiO3 perovskite samples were investigated using Perturbed Angular Correlation spectroscopy. Three electric field gradients were detected and their fractions and hyperfine parameters were measured in the temperature range from 26 to 700 K. The fraction f0 having a vanishing quadrupole frequency, as expected for 111Cd on substitutional sites in a cubic lattice, starts to develop around 300 K and reaches 100% at 700 K. Two well-defined EFG's having closely lying quadrupole frequencies and asymmetry parameters of ωQi = 49.1(3) Mrad/s, 77, η0= 0.10(2) and ωQ2 = 51.8(3) Mrad/s, η2 = 0.12(2), at room temperature, were identified in the temperature range from 250 to 530 K, and their (100) orientation in the lattice was determined. They are associated with electronic defects at the probe atoms.

scholarly journals Electric Field Gradients at the In Site in Au-In Compounds

1998 ◽  
Vol 53 (6-7) ◽  
pp. 349-354 ◽  
Author(s):  
P. Wodniecki ◽  
A. Kulińska ◽  
B. Wodniecka ◽  
A. Z. Hrynkiewicz
Keyword(s):  
High Temperature ◽  
Electric Field ◽  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
High Temperature Phase ◽  
Correlation Technique ◽  
Temperature Phase ◽  
Electric Field Gradients ◽  
Field Gradients ◽  
Temperature Dependences

Abstract The quadrupole interaction in Au-In compounds of different stoichiometrics was studied with the perturbed angular correlation technique. The electric field gradients at 111Cd probes were measured and the temperature dependences of the quadrupole frequencies were determined. A new high temperature phase of Auln above 630 K and a new metastable modification of Au7In3 were found.

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