Abstract
Abstract Gadolinium zirconate (Gd 2 Zr 2 O 7 ) prepared by solid state reaction exhibited a defect fluorite-type structure. Reactions between Gd 2 Zr 2 O 7 ceramic and vanadium pentoxide (V 2 O 5 ), sodium sulfate (Na 2 SO 4 ), and V 2 O 5 + Na 2 SO 4 mixture were investigated from 700 to 1000 °C in air using an X-ray diffractometer (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). V 2 O 5 reacts with Gd 2 Zr 2 O 7 to form gadolinium vanadate (GdVO 4 ) and monoclinic zirconia ( m -ZrO 2 ) at 900 and 1000 °C in air. However, no chemical reaction product between Na 2 SO 4 and Gd 2 Zr 2 O 7 is found at 900 and 1000 °C in air. V 2 O 5 reacts with equal molar Na 2 SO 4 to form sodium vanadate (NaVO 3 ) at 610 °C. In the temperature range of 700–1000 °C, Na 2 SO 4 + V 2 O 5 mixture reacts with Gd 2 Zr 2 O 7 in air to form the final reaction products of GdVO 4 and m -ZrO 2 .
Published Version
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