NDLI: Electric relaxation and Mn$^{3+}$/Mn$^{4+}$ charge transfer in Fe-doped Bi$_{12}$MnO$_{20}$–BiMn$_{2}$O$

Content Provider	Springer Nature Link
Author	Leonarska, A. Kądziołka Gaweł, M. Szeremeta, A. Z. Bujakiewicz Korońska, R. Kalvane, A. Molak, A.
Copyright Year	2016
Abstract	Fe-doped Bi$_{12}$MnO$_{20}$–BiMn$_{2}$O$_{5}$ ceramics was sintered at 1130 K for 6 h in ambient air. Two centro-symmetric phases formed thermodynamically stable self-composite material that was deduced from X-ray pattern analysis. The lattice parameters were a = 10.147(8) Å—for the cubic I23 Bi$_{12}$MnO$_{20}$ phase; and a = 7.545(4) Å, b = 8.538(1) Å, c = 5.758(3) Å—for the orthorhombic Pbam BiMn$_{2}$O$_{5}$ phase. The $^{57}$Fe Mössbauer spectrum, recorded at room temperature, has shown pure electronic quadrupolar split. The major doublets reflected the occurrence of Fe$^{3+}$ ions distributed in two sites, i.e., octahedral Fe$^{4+}$O$_{6}$ and square pyramidal Fe$^{3+}$O$_{5}$, with preferential occupation of the pyramidal sites, that was consistent with the Pbam phase symmetry. The third doublet resulted from the presence of iron Fe$^{3+}$ in tetrahedral Fe$^{3+}$O$_{4}$ coordination and corresponded to a small admixture of the I23 phase. The DC resistivity ρ $_{DC}$(T) dependence on temperature has shown thermally activated features, and the value of E $_{a,DC}$ varied in the range of 0.22–0.37 eV. The electric impedance was measured in the f = 20 Hz–1 MHz and 100–690 K range. Two electrical relaxations were determined using the electric modulus formalism M″(T). Low-temperature relaxation has shown the temperature-dependent activation energy E $_{A,1}$ = 0.14–0.20 eV and characteristic time values of τ $_{01}$ = 10$^{−10}$–10$^{−12}$ s in 100–200 K range. It was attributed to the charge transfer between Mn$^{4+}$/Mn$^{3+}$ sites. The other relaxation occurred in the 170–220 K range, and it exhibited the following values: τ $_{02}$ = 10$^{−11}$ s, and E $_{A,2}$ = 0.27 eV. A disorder-related VRH polaron model was proposed for ρ $_{DC}$(T) and for electric relaxation processes.
Starting Page	2222
Ending Page	2231
Page Count	10
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	52
Issue Number	4
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2016-10-24
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography and Scattering Methods Classical Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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