Plasma-sprayed gadolinium-doped ceria (GDC) for intermediate temperature solid electrolyte
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10 mol% gadolinium-doped cerium (IV) oxide was prepared by solid-state reaction route and deposited as a thick film usingthermal (plasma) spray technique. The phase development, microstructure and topography were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The mechanical strength of thedeposited film was determined by pull-off adhesion test. The plasma-sprayed GDC was characterized for its electricalproperties by dc four-probe conductivity experiments. The maximum conductivity for plasma-sprayed GDC was found to be3.60 × 10−2 Scm−1, which was lesser than 2.25 × 10−1 Scm−1for the CIP-sintered GDC at 1000 oC and pO2= 0.21 atm. Thedecrease in the conductivity is attributed to the larger intergranular spaces and uneven networking observed in themicrostructure resulted in higher activation energy and low conductivity.
Abstract
10 mol% gadolinium-doped cerium (IV) oxide was prepared by solid-state reaction route and deposited as a thick film usingthermal (plasma) spray technique. The phase development, microstructure and topography were characterized by X-raydiffraction (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The mechanical strength of thedeposited film was determined by pull-off adhesion test. The plasma-sprayed GDC was characterized for its electricalproperties by dc four-probe conductivity experiments. The maximum conductivity for plasma-sprayed GDC was found to be3.60 × 10−2 Scm−1, which was lesser than 2.25 × 10−1 Scm−1for the CIP-sintered GDC at 1000 oC and pO2= 0.21 atm. Thedecrease in the conductivity is attributed to the larger intergranular spaces and uneven networking observed in themicrostructure resulted in higher activation energy and low conductivity.
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