dc.creator | Parente, Carlos Benedicto Ramos | |
dc.creator | Mazzocchi, Vera Lucia | |
dc.creator | Mestnik Filho, José | |
dc.creator | Mascarenhas, Yvonne Primerano | |
dc.creator | Berliner, R. | |
dc.date.accessioned | 2016-02-29T14:56:01Z | |
dc.date.accessioned | 2018-07-04T16:53:14Z | |
dc.date.available | 2016-02-29T14:56:01Z | |
dc.date.available | 2018-07-04T16:53:14Z | |
dc.date.created | 2016-02-29T14:56:01Z | |
dc.date.issued | 2010-10 | |
dc.identifier | Nuclear Instruments and Methods in Physics Research A,Amsterdam : Elsevier Science,v. 622, n. 3, p. 678-684, Oct. 2010 | |
dc.identifier | 0168-9002 | |
dc.identifier | http://www.producao.usp.br/handle/BDPI/49688 | |
dc.identifier | 10.1016/j.nima.2010.06.203 | |
dc.identifier | http://dx.doi.org/10.1016/j.nima.2010.06.203 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1641722 | |
dc.description.abstract | A high-resolution powder diffractometer (HRPD) was installed on the IEA-R1 research reactor at IPEN-CNEN/SP, São Paulo, SP, Brazil. It is an extensive upgrade of the old IPEN-CNEN/SP multipurpose neutron diffractometer which used a single boron trifluoride (BF3) detector and a flat mosaic single crystal copper monochromator. The main modifications introduced were the installation of a position sensitive detector (PSD) and a focusing silicon monochromator. Placed at a distance of 1600 mm from sample, the PSD spans an angular range of 20° of a diffraction pattern. An extensive powder diffraction pattern can be obtained by collecting data in contiguous 20° segments. The double-focusing perfect single crystal silicon monochromator, installed in a take-off angle of 84°, can be positioned to produce 4 different wavelengths, namely 1.111, 1.399, 1.667 and 2.191 Å (nominal values). Diffraction patterns, obtained with the instrument, have shown a quite good resolution. Curves full width at half maximum (FWHM) vs. scattering angle (2θ) have been measured with powdered alumina using three vanadium sample holders 1/8, 1/4 and 3/8 in. in diameter. Such curves give the resolution that can be expected from the instrument in an interval 2θ from 5° to 130°. In comparison to the former instrument, the new diffractometer has much better resolution and is, per intensity point, ca. 600 times faster in data acquisition. | |
dc.language | eng | |
dc.publisher | Elsevier Science | |
dc.publisher | Amsterdam | |
dc.relation | Nuclear Instruments and Methods in Physics Research A | |
dc.rights | Copyright Elsevier Science | |
dc.rights | restrictedAccess | |
dc.subject | HRPD | |
dc.subject | PSD | |
dc.subject | Focusing monochromator | |
dc.title | Aurora-A high-resolution powder diffractometer installed on the IEA-R1 research reactor at IPEN-CNEN/SP | |
dc.type | Artículos de revistas | |