Texture and structural refinement using neutron diffraction data from molybdite (MoO3) and calcite (CaCO3) powders and a Ni-rich Ni50.7Ti49.30 alloy

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dc.contributorVirginia Techen
dc.contributor.authorSitepu, H.en
dc.contributor.departmentGeosciencesen
dc.date.accessed2014-07-15en
dc.date.accessioned2014-07-21T15:49:44Zen
dc.date.available2014-07-21T15:49:44Zen
dc.date.issued2009-12en
dc.description.abstractPreferred orientation or texture is a common feature of experimental powder patterns. The mathematics of two commonly used models for preferred orientation-the March-Dollase and the generalized spherical-harmonic models-is reviewed. Both models were applied individually to neutron powder data from uniaxially pressed molybdite (MoO3) and calcite (CaCO3) powders in Rietveld analyses, as well as the as-received powders. The structural refinement results are compared to single-crystal structures. The results indicate that reasonable refinement of crystal structures can be obtained using either the March model or generalized spherical-harmonic description. However, the generalized spherical-harmonic description provided better Rietveld fits than the March model for the molybdite and calcite. Therefore, the generalized spherical-harmonic description is recommended for correction of preferred orientation in neutron diffraction analysis for both crystal structure refinement and phase composition analysis. Subsequently, the generalized spherical-harmonic description is extended to crystal structure refinement of annealed and the aged polycrystalline Ni-rich Ni50.7Ti49.30 shape memory alloys. (C) 2009 International Centre for Diffraction Data. [DOI: 10.1154/1.3257906]en
dc.description.sponsorshipCOMPRES under NSF Cooperative Agreement No. EAR 01-35554en
dc.format.mimetypeapplication/pdfen
dc.identifier.citationSitepu, H., "Texture and structural refinement using neutron diffraction data from molybdite (MoO3) and calcite (CaCO3) powders and a Ni-rich Ni50.7Ti49.30 alloy," Powder Diffr., Vol. 24(4), 2009. DOI: 10.1154/1.3257906en
dc.identifier.doihttps://doi.org/10.1154/1.3257906en
dc.identifier.issn0885-7156en
dc.identifier.urihttp://hdl.handle.net/10919/49655en
dc.identifier.urlhttp://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8491214&fulltextType=RA&fileId=S0885715600001767en
dc.language.isoenen
dc.publisherCambridge University Pressen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectpreferred orientationen
dc.subjecttextureen
dc.subjectneutron powder diffractionen
dc.subjectmarch modelen
dc.subjectgeneralized spherical harmonicsen
dc.subjectmolybditeen
dc.subjectcalciteen
dc.subjectti50.70ni49.30en
dc.subjectshape memory alloyen
dc.subjectshape-memory alloyen
dc.subjectpreferred orientationen
dc.subjectrietveld refinementen
dc.subjectx-rayen
dc.subjectcrystal-structureen
dc.subjectphaseen
dc.subjectmodelen
dc.subjectdistributionsen
dc.subjectintensitiesen
dc.subjectdensityen
dc.subjectmaterials science, characterization & testingen
dc.titleTexture and structural refinement using neutron diffraction data from molybdite (MoO3) and calcite (CaCO3) powders and a Ni-rich Ni50.7Ti49.30 alloyen
dc.title.serialPowder Diffractionen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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