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Electrical and Mechanical Properties of Zirconia Based Cubic/Tetragonal Composite Electrolytes Prepared by Solution Coating Method
Author(s) -
Ghatee M.
Publication year - 2018
Publication title -
fuel cells
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.485
H-Index - 69
eISSN - 1615-6854
pISSN - 1615-6846
DOI - 10.1002/fuce.201700038
Subject(s) - materials science , cubic zirconia , yttria stabilized zirconia , microstructure , scanning electron microscope , composite number , composite material , vickers hardness test , indentation hardness , dielectric spectroscopy , tetragonal crystal system , coating , fracture toughness , phase (matter) , ceramic , electrochemistry , chemistry , electrode , organic chemistry
In this study, cubic/tetragonal zirconia based composite electrolytes were prepared by coating of 8YSZ powders with zirconia. At first zirconia solution was prepared and coated over the surface of 8YSZ(8 mol.% yttria stabilized zirconia) powders. The resulting powders then were formed into cylindrical specimens and sintered at various temperatures. Microstructure and phase content of samples were characterized by scanning electron microscopy (SEM) and X‐ray diffraction (XRD) techniques, respectively. The electrical conductivity of composite samples was studied by electrochemical impedance spectroscopy. In addition, hardness, toughness and fracture strength of samples were measured by Vickers microhardness indentation and ring on ring test, respectively. It was found that the homogeneous tetragonal/cubic composite electrolytes with improved electrical and mechanical properties at low temperatures can be obtained by this method.