This study focused on the possibility of using CaCO3 from chicken eggshell waste as a starting material for synthesizing Ca4Nb2O9 powder via
a conventional solid state reaction. The heat behavior of CaCO3 and Nb2O5 raw material mixture was studied by thermogravimetric analysis
(TGA). Phase formation of Ca4Nb2O9 was studied as a function of calcination conditions by Fourier transform infrared spectroscopy (FT-IR),
Raman spectroscopy and X-ray diffraction (XRD). The morphology and microstructure were charaterized via Scanning electron microscope
(SEM). The X-ray fluorescence (XRF) results showed that the chicken eggshell contained more than 96.0% of CaCO3 by weight. The XRD
pattern peaks matched the peaks of calcite CaCO3 ICDD No. 85-11108 very well. Furthermore, the XRD results and Rietveld refinement analysis
confirmed that the purity and single phase of Ca4Nb2O9 corresponded to the monoclinic structure (ICDD: 49-0911) obtained after the calcination
process. The non-isothermal kinetic of Ca4Nb2O9 also was investigated by the Ozawa methods. This study indicated that CaCO3 from chicken
eggshell waste is an alternative starting material for synthesizing Ca4Nb2O9 powder.
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