Journal
APPLIED PHYSICS LETTERS
Volume 106, Issue 2, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4905596
Keywords
-
Categories
Funding
- Natural Science Foundation of China [51202153, 11274237, 51228201, 11004145, 11174130]
- Ministry of Education of China [20123201120028]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- U.S. National Science Foundation [NSF-1007969]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1007969] Funding Source: National Science Foundation
Ask authors/readers for more resources
The impedance spectroscopy of Z-type hexaferrite Sr3Co2Fe24O41 (SCFO) has been investigated as a function of temperature from 303 to 503 K. The frequency dependent impedance (Z '') and modulus (M '') spectra show that for the air annealed SCFO, the electrical responses of SCFO are thermal activated and there is a distribution of relaxation times. The scaling behaviors of Z '' and M '' spectra further suggest that the distribution of relaxation times is temperature independent. The Cole-Cole plots in impedance formalism show that the electrical response of SCFO originates from both the grain and the grain-boundaries. The activation energies for grain and grain boundary are 0.66 eV and 0.67 eV, respectively. The frequency dependent conductivity (sigma') spectra follow the universal power law. The fitting results of sigma' spectra show that the small polaron hopping is the most probable conduction mechanism for SCFO. Moreover, the scaling behavior of sigma' spectra further confirms that the distribution of local electrical response times is temperature independent. The air plus O-2 annealed SCFO shows thermally activated electrical responses and scaling behaviors as well. The above results show that although the electrical responses of SCFO are temperature dependent, the relaxation mechanism in SCFO is temperature independent. (C) 2015 AIP Publishing LLC.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available