It has been determined the crystallite size by XRD technique using Scherrer equation and Williamson-Hull Plot method. While the particle size is determined by SEM using Image-J software. For this purpose, synthesized samples of compound Gd0,95La0.05Ba2Cu3O7-d phase. From the calculation results, obtained the crystallite size in nanometers order, however the crystallite size resulting from the Scherrer equations and Scherrer Modified is different, i.e. 63.1675 nm and 67.0005 nm. The results of the crystallite size calculation by the scherrer equation directly and modified differed from that of the Williamson-Hull Plot method (97,3040 nm). Meanwhile, the results of the Williamson-Hull Plot methods and SEM show almost the same value (98.7297nm).
A study of the current-voltage (I-V) curve of the chitosan-silver nanoparticle composite membrane (Ch-AgNP) has been conducted. Membranes were prepared by casting method using chitosan as matrix, acetic acid 1% as solvent and silver nanoparticle (AgNP) as filler. AgNP used was 100 ?g. As a comparison is a pure chitosan membrane (membrane Ch). The I-V measurement was performed using a cell model consisting of 2 chambers, chambers 1 and 2. The voltage (V) was measured using Ag/AgCl calomel electrode in electrolyte solution of KCl and CaCl2 with concentration of 0.025 M. All measurements were done at room temperature ± 28 0C. The result shows that in the current range 0.66-0.98 mA, the I-V curve of the Ch-AgNP membrane is ohmic. The conduction value of the composite membrane is smaller than that of the chitosan membrane and the value is greater in the KCl solution than in CaCl2 solution.
The research of determination of the oxide mineral contents of the Tegal Lenga Beach iron sand by using XRD has been done. Iron sand samples were taken from the top layer of the Tegal Lenga Beach sand. The three sand samples were taken from three different places which were separated at a distance of 15 m one another. The separation process is carried out using magnetic separation method. The characterization methods include mass fraction and X-ray diffraction (XRD). It obtained that the average mass fraction of the Tegal Lenga Beach iron sand is 54.71%. The minerals oxide contained are magnesium diiron (III) oxide (Mg Fe2 O4 and iron iron (III) titanium aluminum magnesium vanadium manganese silicon oxide (Fe4.42 Fe5.245 Ti4.72 Al0.7 Mg0.4 Cr0.3 V0.15) (Fe7.82 Mn0.114Si0.06) O32). The main oxide mineral compound is Magnesioferrite (MgFe2O4) oxide mineral of 51.34%. Abstract -Penelitian penentuan kandungan mineral oksida pasir besi Pantai Tegal Lenga dengan menggunakan XRD telah dilakukan. Sampel pasir besi diambil dari lapisan atas pasir Pantai TegalLenga. Tiga sampel pasir diambil dari tiga tempat berbeda yang dipisahkan pada jarak 15 m satu sama lain. Proses pemisahan dilakukan dengan menggunakan metode pemisahan magnetik. Metode karakterisasi meliputi fraksi massa dan difraksi sinar-X (XRD). Diperoleh bahwa fraksi massa rata-rata pasir besi Pantai Tegal Lenga adalah 54,71%. Mineral oksida yang terkandung adalah magnesium diiron (III) oksida (Mg Fe2 O4) dan besi besi (III) titanium aluminium magnesium vanadium silikon oksida mangan (Fe4.42 Fe5.245 Ti4.72 Al0.7 Mg0.4 Cr0.3 V0.15) (Fe7.82 Mn0.114Si0.06) O32). Senyawa mineral oksida utama adalah mineral oksida Magnesioferrite (MgFe2O4) yaitu 51.34%.Kata kunci: Mineral oxide, pasir besi Pantai Tegal Lenga, X-ray diffraction (XRD)
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