Publicación: FAST SOLUTION SYNTHESIS OF NIO-GD0.1CE0.9O1.95 NANOCOMPOSITE VIA DIFFERENT APPROACH: INFLUENCE OF PROCESSING PARAMETERS AND CHARACTERIZATIONS
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2021
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THE SYNTHESIS OF THE NICKEL OXIDE-GADOLINIUM DOPED CERIA (NIO-GDC WITH 65:35 WT. %) NANOCOMPOSITE POWDERS WITH A STOICHIOMETRY OF GD0.1CE0.9O1.95 WAS PERFORMED VIA FAST SOLUTION COMBUSTION TECHNIQUE; USING THREE DIFFERENT MIXING METHODS: (I) CM (METAL CATIONS IN AN AQUEOUS SOLUTION), (II) HM (HAND MORTAR), AND (III) BM (BALL MILLING). THE NANOCOMPOSITE POWDERS WERE CALCINED AT 700 °C FOR 2 H AND CHARACTERIZED BY TRANSMISSION ELECTRON MICROSCOPY (TEM), X-RAY FLUORESCENCE (XRF), AND X-RAY DIFFRACTION XRD. THE TEM AND XRD ANALYSES EVIDENCED THE WELL-DISPERSED NIO AND GDC CRYSTALLITES WITH THE ABSENCE OF SECONDARY PHASES, RESPECTIVELY. LATER, THE CALCINED POWDERS (NIO-GDC NANOCOMPOSITES) WERE COMPACTED AND SINTERED AT 1500 °C FOR 2 H. THE MICROHARDNESS OF THE SINTERED NANOCOMPOSITES VARIES IN ACCORDANCE WITH THE SYNTHESIS APPROACH: A HIGHER MICROHARDNESS OF 6.04 GPA WAS OBTAINED FOR NANOCOMPOSITES SYNTHESIZED THROUGH CM, WHILE 5.94 AND 5.41 GPA WERE OBTAINED FOR BALL-MILLING AND HAND-MORTAR APPROACH, RESPECTIVELY. FURTHERMORE, IT WAS OBSERVED THAT REGARDLESS OF THE LONG TIME-CONSUMING BALL-MILLING PROCESS WITH RESPECT TO THE HAND MORTAR, THERE WAS NO SIGNIFICANT IMPROVEMENT IN THE ELECTRICAL PROPERTIES.
