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Production and Characterization of Magnesium‐Doped Copper Chromite Fibers
Author(s) -
Kaya Ismail C.,
Akyildiz Hasan
Publication year - 2018
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.201700795
Subject(s) - materials science , doping , magnesium , copper , electrospinning , band gap , transmittance , hexagonal phase , analytical chemistry (journal) , chemical engineering , nuclear chemistry , metallurgy , hexagonal crystal system , crystallography , composite material , chemistry , polymer , optoelectronics , chromatography , engineering
In this study, Mg‐doped CuCr 1− x Mg x O 2 ( x = 0, 0.01, 0.03, 0.05) fibers are synthesized via electrospinning process followed by a two‐step heat treatment in air and Ar atmospheres. The produced samples are all crystalline with a fiber diameter ranging from 120 to 140 nm. The effect of Mg 2+ substitution for Cr 3+ on the structural, morphological, and optical properties of CuCrO 2 fibers is investigated systematically. Structural characterizations indicate that the solubility limit of Mg 2+ is around 3 at.% and beyond this concentration the formation of MgO phase is observed. This also leads to the formation of Cu cations with ( + 2) oxidation state. In addition, the incorporation of Mg into the CuCrO 2 lattice hinders the formation of perfect hexagonal‐shaped isolated grains and contribute to the preservation of fiber morphology after the final sintering step. Further, the optical transmittance in the visible range decreases with increasing Mg‐doping ratio. The corresponding optical band gaps are determined to be 3.53, 3.47, 3.30, and 3.22 eV, respectively, for x = 0, 0.01, 0.03, 0.05.