Rietveld texture analysis from TOF neutron diffraction data

Abstract

One of the advantages of a multidetector neutron time-of-flight diffractometer such as the high pressure preferred orientation diffractometer (HIPPO) at the Los Alamos Neutron Science Center is the capability to measure efficiently preferred orientation of bulk materials. A routine experimental method for measurements, both at ambient conditions, as well as high or low temperatures, has been established. However, only recently has the complex data analysis been streamlined to make it straightforward for a noninitiated user. Here, we describe the Rietveld texture analysis of HIPPO data with the computer code Materials Analysis Using Diffraction (MAUD) as a step-by-step procedure and illustrate it with a metamorphic quartz rock. Postprocessing of the results is described and neutron diffraction results are compared with electron backscatter diffraction measurements on the same sample.

Using Neutron Diffraction to Investigate Texture Evolution During Consolidation of Deuterated Triaminotrinitrobenzene (d-TATB) Explosive Powder

“…After the experiment was conducted on the SMARTS instrument to the final pressed pellet density of 1.615 g/cm 3 , the full texture of the resulting pellet was measured using all 45 detector panels of the high pressure preferred orientation (HIPPO) diffractometer [20,37] at the LANSCE Lujan Center. The data analysis performed to determine texture from data collected using HIPPO followed procedures described by Matthies et al [38], and Wenk et al [39]. The sample was not removed from the die between the in situ measurements performed using the SMARTS and the final texture measurements using HIPPO; however, a small amount of relaxation in the sample during that period of time was possible.…”

Crystallographic preferred orientations of exhumed subduction channel rocks from the Eclogite Zone of the Tauern Window (Eastern Alps, Austria), and implications on rock elastic anisotropies at great depths

“…We used the MAUD software for the texture evaluation (Lutterotti et al, 1997;Wenk et al, 2010), for the discussion of practical limitations refer to Wenk et al (2012) and Keppler et al (2014). Since RTA requires knowledge of the mineral structures present in the sample, mineral assemblages and chemical compositions were determined by means of microprobe analysis on a JEOL JXA 8200 Electron microprobe.…”

High-temperature neutron diffraction and first-principles study of temperature-dependent crystal structures and atomic vibrations in Ti3AlC2, Ti2AlC, and Ti5Al2C3

“…Structure refinement A texture analysis using the Material Analysis Using Diffraction, MAUD, code [32,34] showed a mild fiber texture for all temperature points. As the texture was weak, the data from the three rotations and the detector rings were integrated, resulting in one histogram per detector bank.…”