Ferroelectric Relaxor Behavior and Impedance Spectroscopy of Pr and Sn-Doped La0.57Ba0.33MnO3 Ceramics

• Published in: Journal of low temperature physics Vol. 178; no. 5-6; pp. 272 - 284
• Main Authors: Rhouma, F. I. H., Dhahri, A., Lahmar, L., Khirouni, K., Dhahri, J.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 2015
• Subjects: Characterization and Evaluation of Materials; Condensed Matter Physics; Magnetic Materials; Magnetism; Physics; Physics and Astronomy; X-ray diffraction; Ferroelectricity; Dielectric properties; Manganites
• ISSN: 0022-2291; 1573-7357
• DOI: 10.1007/s10909-014-1260-z

The ceramic sample is synthesized in the solid-state with a nominal chemical formula
La
0.57
3
+
Pr
0.1
3
+
Ba
0.33
2
+
Mn
0.67
3
+
Mn
0.23
4
+
Sn
0.1
4
+
O
3
2
-
(LPBMS). X-ray diffraction patterns confirm the formation of a single-phase cubic crystal symmetry (
Pm
3
¯
m
)
. Furthermore, the complex impedance plots display a single semicircle highlighting the influence of grain resistance on the electrical behavior. A detailed study of impedance parameters shows the non-Debye temperature of relaxation phenomena in the system. Over four decades in frequency, sample Nyquist plots were fitted by adopting an equivalent circuit using constant phase elements. The temperature dependence of dielectric permittivity was investigated in the sample, and the dielectric relaxation behavior was observed in these ferroelectrics with diffused phase transition. Quasiferroeletric state theory has been introduced to explain the dielectric results of the LPBMS relaxors.