The Performance of Fine Resolution Neutron Powder Diffractometer at PTBIN-BATAN

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 201

Crystallite Size and Microstrain Measurement of Cathode Material after Mechanical Milling using Neutron Diffraction Technique

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 201

Texture Characterization of Duplex Stainless Steel 2205 Using Neutron Diffraction Method

Duplex stainless steel (DSS) is widely used in chemical processes, petrochemical, oil & gas industries, and nuclear technology due to its excellent mechanical properties and exceptional generalized and localized corrosion resistance. In this study, the crystal structure, material phases, and texture characterization of DSS were carried out using the neutron diffraction method. The characterization results show that the duplex has two phases: α (ferrite) and g (austenite), each with a lattice parameter 2.8736 Angstrom and 3.6076 Angstrom, respectively. The sample symmetrization method from triclinic to orthorhombic are used to analyze pole figures. The crystallite orientation in the α and g phases have the opposite direction. The α phase has a crystallite orientation towards {110} <001> or Goss orientation, and the g phase, crystal orientation towards {100} <001> or the cube orientation. The orientation distribution function shows that the orientation strength of ferrite is much stronger than austenite. The crystallite orientation (texture) obtained by the orientation distribution function analysis follows the crystal structure analysis

Analysis of Crystal Structure of the Welds with Friction-stir Welding Method on the Retreating Side for Bimetallic Disimilar Aa6061-cu Using Neutron Diffraction Techniques

Crystal structure analysis has been performed on bimetallic disimilar Al-Cu. Neutron diffraction analysis shows that Al lattice parameter decrease from 4.09 Å to 4.05 Å while the Cu lattice parameter is relatively constant. This is due to the melting point ofAl is much lower than the melting point of Cu. Physically, during the Friction Stir Welding (FSW) process in the Stir Zone (SZ) or Nuget Welded Zone (NWZ) region, strong deformation occurs at temperatures around 500 oC. This leads to dynamic recrystallization where grains become more refined. At the Thermo Mechanically Affected Zone (TMAZ) region, atomic diffusion occurs due to a combination of strong plastic deformation at high temperatures. And for Heat Affected Zone (HAZ) area there are aluminium even with a very small percentage of weight, this is due to the exposure at a high temperature during the heating FSW process, similar with annnealing-like process, which leads to the dislocation disappears, dissolves and precipitates grain becomes rough when the temperature exceeds 250 oC

Determination of Crystal and Magnetic Structure of La0,47ca0,53mn1-ycuyo3 (0 < Y < 0.09) Using High Resolution Neutron Powder Diffractometer

Crystal and magnetic structure of La0,47Ca0,53Mn1-yCuyO3 with 0 < y < 0.09 at low and room temperature have been analyzes using High Resolution Neutron Powder Diffraction (HRPD). It is obtained that at room temperature as well as at low temperature, the samples have orthorhombic structure with Pnma space group. Increasing x value, will increase the lattice volume. At room temperature, samples have paramagnetic stucture, while at low temperature have antiferromagnetic structure. The value of magnetic moment will decrease with increasing x value

PENGGUNAAN HIGH RESOLUTION NEUTRON POWDER DIFFRACTOMETER UNTUK MENENTUKAN STRUKTUR KRISTAL DAN MAGNETIK SENYAWA La0,47Ca0,53Mn1-yCuyO3 (0 < y < 0,09)

PENGGUNAAN HIGH RESOLUTION NEUTRON POWDER DIFFRACTOMETER UNTUK MENENTUKAN STRUKTUR KRISTAL DAN MAGNETIK SENYAWA La0,47Ca0,53Mn1-yCuyO3 (0 < y < 0,09). Telah dianalisis pada suhu ruang dan suhu rendah struktur kristal dan magnetik sampel La0,47Ca0,53Mn1-yCuyO3 0 < y < 0,09 menggunakan High Resolution Neutron Powder Diffractometer (HRPD). Didapatkan bahwa pada suhu ruang dan suhu rendah, sampel mempunyai struktur kristal orthorhombic dengan space group Pnma. Semakin meningkat nilai x, maka volume kisi semakin besar juga. Pada suhu ruang sampel mempunyai sifat paramagnetik, sedangkan pada suhu rendah bersifat antiferomagnetik bercampur feromagnetik. Nilai momen magnetik semakin kecil seiring meningkatnya nilai x

The Performance of Fine Resolution Neutron Powder Diffractometer at PTBIN-BATAN

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

Crystallite Size and Microstrain Measurement of Cathode Material after Mechanical Milling using Neutron Diffraction Technique

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