Structural and physical properties of microwave synthesized orthorhombic perovskite erbium chromite ErCrO3 |
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Authors: | Jesús Prado-GonjalRainer Schmidt David ÁvilaUlises Amador Emilio Morán |
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Affiliation: | a Dpto. Química Inorgánica I, Facultad de CC. Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain b Dpto. Física Aplicada III, Facultad de CC. Físicas, GFMC, Universidad Complutense de Madrid, 28040 Madrid, Spain c Dpto. Química, Facultad de Farmacia, Universidad San Pablo, CEU, 28668 Boadilla del Monte, Madrid, Spain |
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Abstract: | Rare-earth chromite ErCrO3 powder was synthesized from metal nitrate precursors using microwave synthesis. (Micro-) structural characterizations were performed using X-ray diffraction, Rietveld refinement, High Resolution Transmission Electron Microscopy and Electron Micro-Diffraction. Magnetization vs. temperature measurements revealed anti-ferromagnetism with TNeel ≈ 135 K. An anti-ferrimagnetic moment of ≈0.4 μB was determined from magnetization vs. applied field measurements. Temperature dependent impedance spectroscopy (IS) indicated 3 dielectric relaxation processes: electrode interface, grain boundary and bulk. The intrinsic bulk activation energy was found to be 0.27 eV and the dielectric permittivity ?r was ≈23 in excellent agreement with Clausius-Mossotti predictions and showed no perceptible temperature dependence. This and the low ?r value suggested that ErCrO3 is a dielectric rather than ferroelectric compound. IS measurements with applied dc bias revealed the signs of an unconventional type of Schottky barrier at the metallic Au electrode/ceramic ErCrO3 interface. |
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Keywords: | A Microwave processing B Microstructure-final B X-ray methods C Dielectric properties C Magnetic properties Chromites |
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