Producing Calcium Cuprum Mangan Oxide (CaCu3Mn4O12) Via Wet And Dry Chemistry Techniques

Nurul Hidayah , Ismail (2009) Producing Calcium Cuprum Mangan Oxide (CaCu3Mn4O12) Via Wet And Dry Chemistry Techniques. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

In this project, the preparation of CaCu3Mn4O12 is carried out via wet-chemistry and solid state reaction methods so that at the end of this study, the differences in the characteristic of the samples produced can be clarified. In addition, in solid state reaction method, the CaCu3Mn4O12 preparation is done by varying the time used for calcination process in order to investigate the effect of varying that parameter on the characteristics of the product. In order to achieve the objectives of the project, the study is divided into two tasks; preparation of the CaCu3Mn4O12 samples by using sol-gel and solid state reaction method and material testing on the sample produced. In sample preparation, both methods involves the same processes such as precursor preparation; mixing, stirring, drying in sol-gel method while in solid state reaction, it involves mixing and ball milling, followed by calcination, forming and sintering process. For the second task that is for sample testing, the identification of phase formation and microstructural analysis are characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) respectively, while the characterization of electrical properties is done by using impedance analyzer. The study shows that the formation of CaCu3Mn4O12 phase in x-ray diffraction pattern occurs at 600°C in sol-gel sample and at 800°C in solid state reaction sample. SEM micrograph shows the microstructure of sol-gel sample contains small particle size with high grain boundaries whereas the microstructure of sample produced via solid state reaction contains large particle size. Furthermore, experimental observation and theoretical calculation done in electrical characterization clarify that the density as well as grain boundaries are significant factors determining the electrical conductivity of CaCu3Mn4O12 samples. The result shows the solid state reaction sample has higher conductivity value compared to sol-gel sample. Moreover,the result of varying the calcination time in solid state reaction shows no significant different in their phase formation, microstructure and conductivity value.

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