Premium
Study on mechanical, dielectric and magnetic properties of Pr 1– x Sr x FeO 3 ceramics
Author(s) -
Zhu Weili,
He Ju,
Ti Ruixia,
Jin Yaming,
Xu Tingting,
Yue Chen,
Huang Fengzhen,
Lu Xiaomei,
Zhu Jinsong
Publication year - 2014
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201431193
Subject(s) - dielectric , relaxation (psychology) , materials science , arrhenius equation , magnetization , condensed matter physics , anomaly (physics) , spectral line , ceramic , modulus , nuclear magnetic resonance , analytical chemistry (journal) , activation energy , magnetic field , chemistry , composite material , physics , psychology , social psychology , chromatography , quantum mechanics , astronomy , optoelectronics
The mechanical spectra of Pr 1– x Sr x FeO 3– δ ( x = 0.5, 0.55, and 0.6) ceramics were performed at kHz frequencies from 100 to 350 K. An internal friction (IF) peak associated with modulus defect around 130 K and a modulus kink at 200 K were observed. This IF peak temperature shows frequency‐dispersive behavior. The dielectric spectra and magnetization measurements were used to clarify the origin of the anomaly in IF and modulus. The dielectric spectra provide clear evidence for the relaxation behavior of IF peak and the activation energies of 0.14, 0.13, and 0.11 eV were derived from the Arrhenius law for Pr 0.5 Sr 0.5 FeO 3 , Pr 0.45 Sr 0.55 FeO 3 , and Pr 0.4 Sr 0.6 FeO 3 samples, respectively. The relaxation behavior is ascribed to the charge‐carrier hopping between Fe 3+ and Fe 4+ . Furthermore, the magnetization measurement confirms that the kink in the reduced Young's modulus is associated with a spin‐glass transition. In addition, another dielectric anomaly at 200 K may be related to the magneto dielectric effect.