Open AccessZnx-1CuxMn2O4 Spinels; Synthesis, Structural Characterization and Electrical Evaluation
Author(s) -
Francisco Méndez-Martínez,
F. González,
Enrique Lima,
P. Bosch,
Heriberto Pfeiffer
Publication year - 2019
Publication title -
journal of the mexican chemical society
Language(s) - English
Resource type - Journals
ISSN - 2594-0317
DOI - 10.29356/jmcs.v54i1.958
Subject(s) - spinel , varistor , materials science , dielectric spectroscopy , scanning electron microscope , spectroscopy , electrical resistivity and conductivity , characterization (materials science) , copper , ceramic , infrared spectroscopy , analytical chemistry (journal) , mineralogy , metallurgy , chemistry , nanotechnology , composite material , electrochemistry , electrode , physics , organic chemistry , quantum mechanics , voltage , chromatography , electrical engineering , engineering
This work presents the structural characterization and electrical evaluation of Znx-1CuxMn2O4 spinels, which are materials presented as secondary phases into the varistor ceramic systems. Samples were analyzed by X-ray diffraction, solid-state nuclear magnetic resonance, infrared spectroscopy, scanning electron microscopy and impedance spectroscopy. Although, the addition of copper to the ZnMn2O4 spinel did not produce morphological changes, the structure and electrical behaviors changed considerably. Structurally, copper addition induced the formation of partial inverse spinels, and its addition increases significantly the electrical conductivity. Therefore, the formation of Znx-1CuxMn2O4 spinels, as secondary phases into the varistor materials, may compromise significantly the varistor efficiency.
Ceramic, Impedance Spectroscopy, spinel, Varistor, XRD.