A supercritical technique was proposed to synthesise cerate-zirconate ceramic compound by a highpressure-high-temperature batch-wise reactor system. TG thermogram of the dried powders for all samples showed three stages of weight loss. Each stage is corroborated by one or two exothermic peaks as shown in DTG signal. A complete thermal decomposition for all samples is accomplished at *977°C for 2 h. FT-IR and XRD patterns showed the traces of carbonate residue in the calcined samples is due to the incomplete combustion of intermediate compounds. The presence of secondary phases, namely, BaZrO 3 , BaCeO 3 , BaO 2 and CeO 2 as detected by XRD measurement indicates that the calcined samples are not in a single phase of cerate-zirconate compound.
Ceramics powder of BaCe0.54Zr0.36Y0.1O2.95 (BCZY) was synthesized using three different methods namely sol-gel (SG), supercritical fluid (SC) and sol-gel assisted supercritical fluids (SGSF).The respective prepared samples were denoted as S1, S2 and S3. The calcined powder (T= 1100 °C) was analyzed using particle size analyzer (PSA), Pcynometer and scanning electron microscope (SEM). PSA showed a single particle size distribution (PSD) for all samples except for S3 which exhibits bimodial particle distribution. PSD of the samples were in the range of 295-396 nm for the primary powder and 712-820 nm for secondary powder. High relative powder density for S1, S2, S3 were recorded at 95 %, 93 % and 99 %, respectively. Morphology of the calcined powders by SEM micrograph revealed that S1 is in spherical shape, S2 is in cubic structure and S3 showed a mixture of spherical and rod-like structure. It was found that SG and SC produce a single shape of powder with lower density compared with SGSF.
Powder of BaCe0.54Zr0.36Y0.1O2.95 (BCZY) ceramics compound was synthesized by a modi ed sol-gel method using triethylenetetraamine, TETA as a chelating agent. The samples were dried and calcined at 325 • C and 1100 • C, respectively. The resulting powder properties were characterized using Particle Size Analyzer (PSA), Scanning Electron Microscope (SEM), X-Ray Fluorescence Spectroscopy (XRF) and Energy Dispersive X-Ray (EDX). At calcination temperature of 1100 • C, the sample shows particles with high purity, spherical shape and a single particle size distribution in the range of 342 396 nm. XRF and EDX analysis revealed that the elemental composition of Ba, Ce, Zr and Y present in the sample is almost the same as the nominal stoichiometric composition of BCZY compound. Thus, TETA is one of the potential chelating agents that can be used to synthesize high purity and homogeneous spherically grained cerate-zirconate powders.
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