SINTESIS SENYAWA AURIVILLIUS LAPIS EMPAT, SrBi4-xLaxTi4O15 DENGAN METODE HIDROTERMAL

HERMIS, HERMIS (2014) SINTESIS SENYAWA AURIVILLIUS LAPIS EMPAT, SrBi4-xLaxTi4O15 DENGAN METODE HIDROTERMAL. Other thesis, ANDALAS UNIVERSITY.

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Abstract

ABSTRACT SYNTHESIS OF FOUR-LAYERS AURIVILLIUS PHASES, SrBi4-xLaxTi4O15 BY HYDROTHERMAL METHOD by : Hermis (0910412071) Dr. Zulhadjri, M. Eng and Prof. Dr. Syukri Arief M. Eng Aurivillius phases are metal oxide type compound with general formula [Bi2O2]2+[An-1BnO3n+1]2-. Four-layers Aurivillius phases, SrBi4-xLaxTi4O15 with x = 0; 0.5; 1; 1.5 and 2 have been synthesized by hydrothermal techinique using of NaOH 3 M, temperature of 240oC for 72 hours and precursors in the form of nitrate (Sr, Bi, La) and TIP. The products obtained were characterized by X-ray diffraction (XRD) and SEM. All X-ray diffraction data using the program Rietica direfinement Le Bail method. The results obtained showed that all samples had formed a four-layers Aurivillius phase, but still mixed with the perovskite phase and an additional three-layer Aurivillius phase for x > 1 . Along with the increasing number of La3+ in the sample, perovskite phase tends to increase, whereas for x = 1.5 and 2 in addition to the four layer Aurivillius phase and perovskite phase shows a three-layer Aurivillius phase is higher at x = 2 . The morphology of the samples were analyzed using SEM showing the surface of a slab that is the hallmark of Aurivillius phases. Synthesis of the sample x = 1 have done variations with changes in solvent concentration of NaOH (5 M), precursor (metal oxide) and autoclave heating temperature (250oC). The results obtained also showed that the presence of other phases (perovskite and three-layer Aurivillius) other than a four-layer Aurivillius phase, as for the sample with x = 1 shows the temperature of 250oC synthesis of a major phase of perovskite phase. Keywords. Aurivillius phase, Hydrothermal Method

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