Ionic Size Induced Defects in Lead Titanate-Zirconate Perovskite Studied by TDPAC Method

1998 ◽  
Vol 53 (6-7) ◽  
pp. 318-322
Author(s):  
J. Mestnik Filho ◽  
A. W. Carbonari ◽  
E. F. Motta ◽  
M. Moralles ◽  
R. N. Saxena ◽  
...  
Keyword(s):  
Electric Field Gradient ◽  
Lead Titanate ◽  
Point Charge ◽  
Random Distribution ◽  
Perturbed Angular Correlation ◽  
Broad Distribution ◽  
Lead Titanate Zirconate ◽  
Time Differential ◽  
Ionic Size ◽  
Induced Defects

Abstract Time differential perturbed angular correlation (TDPAC) measurements were carried-out on PbZr0.8Ti0.2 O3 as a function of temperature. A broad distribution of electric field gradient (EFG) was observed in all cases with a second site for 181Hf-181 Ta probes in the R3c phase. The results were analyzed in terms of a model which simulates an attraction of the ions by the smaller Ti ions. The EFG was calculated within the point charge approximation, by averaging over a large number of configurations generated by random distribution of the Ti ions in an ensemble of lattice cells. It was verified that the model reproduces qualitatively the broadening of the TDPAC frequencies as well as explains the second component EFG observed experimentally.

scholarly journals TDPAC Studies of Local Defects and Phenomena in Ferroics and Multiferroics

Crystals ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 611 ◽  
Author(s):  
Juliana Schell ◽  
Georg Marschick
Keyword(s):  
Lead Titanate ◽  
Degrees Of Freedom ◽  
Perturbed Angular Correlation ◽  
Bismuth Ferrite ◽  
Lead Zirconate ◽  
Magnetic Interactions ◽  
Time Differential ◽  
Localized Defects ◽  
Local Defects ◽  
Titanate Lead

We provide an overview of time-differential perturbed angular correlation (TDPAC) measurements of ferroic and multiferroic materials. Here, we explore chalcogenide spinels, lead titanate, lead zirconate, and bismuth ferrite, describing the use of TDPAC experiments to probe the physics of localized defects and the various mechanisms that govern electronic and magnetic interactions, the coupling of the associated degrees of freedom, and the structural, charge, and orbital correlations for these materials.

Time-differential perturbed-angular-correlation study of the electric field gradient in amorphousZr68Hf2Cu30

1986 ◽  
Vol 34 (4) ◽  
pp. 2982-2984 ◽  
Author(s):  
L. A. Mendoza-Zélis ◽  
L. C. Damonte ◽  
A. G. Bibiloni ◽  
J. Desimoni ◽  
A. R. López-García
Keyword(s):  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Angular Correlation ◽  
Perturbed Angular Correlation ◽  
Correlation Study ◽  
Time Differential

scholarly journals Systematic Investigation of MF3 Crystalline Compounds (M = Al, Cr, Fe, Ga, In, Sc, Ti, and V) and Fe1-xMxF3 Mixed Series (M = Ga, Cr, V)

1994 ◽  
Vol 49 (1-2) ◽  
pp. 361-366 ◽  
Author(s):  
H.-R. Blank ◽  
M. Frank ◽  
M. Geiger ◽  
J.-M. Greneche ◽  
M. Ismaier ◽  
...  
Keyword(s):  
Angular Distribution ◽  
Electric Field ◽  
Electric Field Gradient ◽  
Field Gradient ◽  
Point Charge ◽  
Structural Parameters ◽  
Systematic Investigation ◽  
Distribution Method ◽  
Time Differential ◽  
Charge Calculations

Abstract The electric field gradient at the fluorine site of several crystalline trifluorides was measured by means of the time differential perturbed angular distribution method. The hyperfine data (vQ and η) are systematically analyzed by taking into account the structural parameters of the crystals; they are also compared to the results obtained by point charge calculations.

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