A. Fajar
Center for Technology of Nuclear Industry Materials, BATAN Puspiptek Serpong, Tangerang, Indonesia

Published : 4 Documents
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Crystallite Size and Microstrain Measurement of Cathode Material after Mechanical Milling using Neutron Diffraction Technique Fajar, A.; Gunawan, Gunawan; Kartini, E.; Mugirahardjo, H.; Ihsan, M.
Atom Indonesia Vol 36, No 3 (2010): December 2010
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (295.277 KB) | DOI: 10.17146/aij.2010.27

Abstract

The measurements of neutron diffraction patterns of commercially product and 10 hour mechanically milled cathode material lithium cobaltites (LiCoO2) have been performed. Rietveld analysis using FullProf does not show the change of crystal structure due to milling process, but the diffraction pattern has a lower intensity and the diffraction-line was broadening. The results of line-broadening study on milled sample using Rietveld methods detected that the microstrain was occurred in the sample with value 0.127080(35) % and the average crystallite size was 424.78(20) Å.Received: 7 October 2010; Revised: 31 October 2010; Accepted: 1 November 2010
QUANTITATIVE PHASE ANALYSIS OF THE ZrNbMoGe ALLOYS USING NEUTRON DIFFRACTION TECHNIQUES ., Parikin; Fajar, A.; Insani, A.; Ismoyo, A. H.; Bandriyana, B.
Jurnal Sains Materi Indonesia Vol 13, No 2 (2012): Februari 2012
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (41.825 KB)

Abstract

Quantitative analysis by neutron diffraction technique can be utilized to measure not only the type of compounds but also the amount of compounds present in a solid or powder system. The technique has been proven for a composition analysis due to offering some advantages particularly for elements with very similar atomic numbers, and for their high penetrating power. A quantitative phase analysis experiment by using neutron diffraction has recently been carried out to determine the amount present of phases in ZrNbMoGe system. The data analysis was obtained by Rietveld refinement method. The result shows that the profiles have a very good fitting (Rwp = 12.62 %, 15.45 % and 16.39 %) with the number of reliable factor among 1.0 and 2.0. The phases of Zr, ZrMo2, Zr3Ge and ZrGe are identified in the specimens. The ZG1 specimen contains of 94.19 %wt of Zr phase, 2.05 %wt of ZrMo2 phase, 3.15 %wt of Zr3Ge and 0.59 %wt of ZrGe phase. Whereas the ZG2 specimen comprises of: 84.45 %wt of Zr phase, 4.16 %wt of ZrMo2 phase, 10.18 %wt of Zr3Ge and 1.20 %wt of ZrGe phase. The volume fraction of the minor phases on specimens shows an increase as addition in Ge content.Keywords: ZrNbMoGe alloys, Rietveld method, Neutron diffraction.
The Performance of Fine Resolution Neutron Powder Diffractometer at PTBIN-BATAN Fajar, A.; Mugirahardjo, H.
Atom Indonesia Vol 36, No 1 (2010): April 2010
Publisher : PPIKSN-BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1207.823 KB) | DOI: 10.17146/aij.2010.5

Abstract

We describe the performance of a fine resolution neutron powder diffractometer, DN3, which has been installed at the neutron guide (NG2) in the Neutron Guide Hall about 71 m away from the Multipurpose G. A. Siwabessy reactor core. DN3 has a multi-detector system which consists of 32 3He neutron detectors and soller-type collimation. The resolution curve of the instrument was found to have little variation over a wide angular region. The best resolution is Δ2θ (FWHM) of 0.23º and Δd / d of 5x10-3, where 2θ and d are scattering angle and d-spacing, respectively. The instrument provides sample environment of low temperatures using a cryostat having a temperature range of 10-300K. Several experimental results, interlaboratory comparison study and he next activities to improve the performance of DN3 equipment have also been discussed. Received: 15 October 2009; Revised: 12 April 2010; Accepted: 21 April 2010
QUANTITATIVE PHASE ANALYSIS OF THE ZrNbMoGe ALLOYS USING NEUTRON DIFFRACTION TECHNIQUES Parikin, Parikin; Fajar, A.; Insani, A.; Ismoyo, A. H.; Bandriyana, B.
Jurnal Sains Materi Indonesia Vol 13, No 2: FEBRUARI 2012
Publisher : BATAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3257.931 KB) | DOI: 10.17146/jsmi.2012.13.2.4718

Abstract

QUANTITATIVE PHASE ANALYSIS OF THE ZrNbMoGe ALLOYS USING NEUTRON DIFFRACTION TECHNIQUES. Quantitative analysis by neutron diffraction technique can be utilized to measure not only the type of compounds but also the amount of compounds present in a solid or powder system. The technique has been proven for a composition analysis due to offering some advantages particularly for elements with very similar atomic numbers, and for their high penetrating power. A quantitative phase analysis experiment by using neutron diffraction has recently been carried out to determine the amount present of phases in ZrNbMoGe system. The data analysis was obtained by Rietveld refinement method. The result shows that the profiles have a very good fitting (Rwp = 12.62 %, 15.45 % and 16.39 %) with the number of reliable factor among 1.0 and 2.0. The phases of Zr, ZrMo2 , Zr3Ge and ZrGe are identified in the specimens. The ZG1 specimen contains of 94.19 %wt of Zr phase, 2.05 %wt of ZrMo2 phase, 3.15 %wt of Zr3Ge and 0.59 %wt of ZrGe phase. Whereas the ZG2 specimen comprises of: 84.45 %wt of Zr phase, 4.16 %wt of ZrMo2 phase, 10.18 %wt of Zr3Ge and 1.20 %wt of ZrGe phase. The volume fraction of the minor phases on specimens shows an increase as addition in Ge content.