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Title: Study of mechanical and dielectric spectrum in YFe{sub 1-x}Mn{sub x}O{sub 3} ceramics

The mechanical spectra of Mn-substituted yttrium orthoferrite YFe{sub 1-x}Mn{sub x}O{sub 3} (x = 0, 0.2, 0.3, 0.4) ceramics were performed at kilohertz from 100 to 360 K. Two internal friction (IF) peaks are observed around 150 K and 230 K, respectively, and both the IF peaks exhibit frequency dispersion behavior. The IF peak around 150 K is associated with a step increase in the modulus and its mechanical relaxation rate follows the Vogel-Fulcher relation with τ{sub 0} = 4.45 × 10{sup −11}s, E{sub α} = 0.03 eV, and T{sub VF} = 155 K. This IF peak can be explained in terms of a freezing of oxygen vacancies after excluding the possible magnetic spin glass transition. Another IF peak around 230 K presents a relaxation behavior and it follows Arrhenius law. Furthermore, the relaxation behavior was verified by the dielectric spectrum and it can be ascribed to the charge carrier hopping between Fe{sup 2+} and Fe{sup 3+}.
Authors:
; ; ; ; ; ; ; ;  [1] ;  [2]
  1. National Laboratory of Solid State Microstructures and Physics School, Nanjing University, Nanjing 210093 (China)
  2. Department of Applied Physics, Hong Kong Polytechnic University, Hong Kong (China)
Publication Date:
OSTI Identifier:
22275743
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 3; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CERAMICS; CHARGE CARRIERS; CONCENTRATION RATIO; DIELECTRIC MATERIALS; ENERGY SPECTRA; INTERNAL FRICTION; IRON COMPOUNDS; IRON IONS; MANGANATES; RELAXATION; SPIN GLASS STATE; TEMPERATURE DEPENDENCE; VACANCIES; YTTRIUM COMPOUNDS