Rietveld refinements on laboratory energy dispersive X-ray diffraction (EDXD) data

Ballirano, Paolo; Caminiti, Ruggero

doi:10.1107/s0021889801014728

Cited by 80 publications

(47 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The EBSD system was calibrated using a single-crystal silicon standard. The experimental EBSD patterns of the two Ti-dominant oxides were indexed with the structures of synthetic Ti 2 O 3 (Newnham and de Haan, 1962;Rice and Robinson, 1977;Vincent et al, 1980), synthetic Ti 3 O 5 (Onoda, 1998), Sc 2 TiO 5 (Ito, 1971), TiO (Loehman et al, 1969), TiO 2 (anatase, rutile, and brookite) reported in Howard et al (1992), Ballirano and Caminiti (2001), and Meagher and Lager (1979), synthetic Ti 4 O 7 (Marezio and Dernier, 1971), and the newly defined minerals panguite and kangite (Ma et al, , 2013. The HKL software automatically suggests indexing solutions ranked by the lowest "mean angular deviation" (MAD) as an index of "goodness of fit."…”

Section: Methodsmentioning

confidence: 99%

Mineralogical anatomy and implications of a Ti–Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite

Zhang

Sakamoto

et al. 2015

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

Titanium-rich minerals are common in Ca-Al-rich inclusions from primitive chondrites. They are important not only for testing the condensation models for a gas with a solar composition, but also for constraining the redox conditions of the early solar nebula. In this study, we report the detailed mineralogical features and its oxygen isotope compositions of a Ti-Sc-rich ultrarefractory inclusion A0031 from a CH3 chondrite Sayh al Uhaymir 290. The A0031 inclusion has a compact and layered texture with the interior consisting of panguite, Sc-rich anosovite, Ti-rich davisite, and anorthite. A few hexaferrum, perovskite, and spinel crystals are present as inclusions in these minerals. Outside of Ti-rich davisite are a layer of Al-Ti-rich diopside and two grains of enstatite. This texture strongly suggests that A0031 has a condensation origin. Panguite is its third occurrence in nature and similar in composition to the type panguite from the Allende meteorite. Sc-rich anosovite in A0031 has a chemical formula of (Ti 4+ ,Ti 3+ ,Mg,Sc,Al) 3 O 5 with the pseudobrookite structure. This is the second report of Ti 3 O 5 in nature, but is the first description of anosovite formed in the solar nebula as an ultrarefractory phase. The discovery of Sc-rich anosovite in A0031 reveals the stability of Ti 3 O 5 in the early solar nebula and supports the prediction of previous equilibrium condensation calculations. The panguite, Sc-rich anosovite, and Ti-rich davisite in A0031 show a large variation in Ti 3+ /Ti tot . The primitive nature of A0031 implies that the variations in Ti 3+ /Ti tot among different Ti-rich minerals are primary features. We propose that the distribution of Ti 3+ and Ti 4+ could be controlled mainly by their various competition abilities of incorporating into these Ti-Sc-Al-rich minerals. Similarity of Ti 3+ /Ti tot value between Ti-rich davisite from A0031 and those in other carbonaceous chondrites indicates that most refractory inclusions might have formed in highly reducing nebular settings. The 16 O-depleted isotope compositions of A0031 confirm the existence of diverse oxygen reservoirs for CH CaAl-rich inclusions in the solar nebula.

show abstract

Section: Methodsmentioning

confidence: 99%

Mineralogical anatomy and implications of a Ti–Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite

Zhang

Sakamoto

et al. 2015

Geochimica et Cosmochimica Acta

View full text Add to dashboard Cite

show abstract

“…10 The structural models for mullite, CoAl 2 O 4 and corundum were based on the data reported in references. [11][12][13] The refinement started in the space group Pbam with mullite structure without cobalt incorporation. 11 For the case of Co 2+ incorporated into mullite, cobalt atoms replaced a fraction of Al atoms at 2a octahedral site.…”

Section: Methodsmentioning

confidence: 99%

CoAl2O4–mullite composites prepared by sol–gel processes

Kurajica

Tkalčeć

Schmauch

2007

Journal of the European Ceramic Society

View full text Add to dashboard Cite

“…Several examples of interpretation procedures have been developed in an ad hoc fashion for specific purposes by several authors. In dealing with energy-dispersive diffraction data acquired from a laboratory X-ray source, Ballirano and Caminiti [1] transformed the data to angular dispersive domain for full-pattern refinement. Similarly, Steuwer et al [24] developed an approach involving the transformation of data into a format of time-of-flight neutron diffraction, and used this approach for their strain mapping investigation using energy-dispersive synchrotron XRD.…”

Section: Introductionmentioning

confidence: 99%

Measurement of Residual Elastic Strains in a Titanium Alloy Using High Energy Synchrotron X-Ray Diffraction

et al. 2006

View full text Add to dashboard Cite

Residual elastic strains in a bent bar of titanium alloy Ti-6Al-4V were measured using high energy diffraction on station 16.3 at SRS Daresbury. Using a single bounce Laue crystal monochromator, diffraction peaks were collected for reflections (00.2), (10.1), (10.2) and (11.0) from the hcp alpha phase of the titanium alloy. Reference values of the lattice spacing for each of the reflections were found from the diffraction pattern collected from a stress-free sampling volume. The residual elastic strain values calculated on the basis of each reflection were then computed and plotted as a function of position across the bent bar. The average macroscopic residual elastic strain was computed using an averaging procedure taking into account the multiplicity of each reflection. Energy dispersive white beam diffraction from the same bent bar was used to collect diffraction patterns over the range of lattice spacings between 0.8 and 2.2 Å . Detector calibration was carried out using the procedure described in Liu et al. (2005) and detailed interpretation of the energy dispersive profiles was carried out allowing the identification of average residual elastic strains in the two principal phases present in the titanium alloy considered, the a-Ti hcp and the b-Ti bcc phases. Peak-specific residual strain profiles computed on the basis of monochromatic measurements show significant differences reflecting the variation in the elastic and plastic properties with grain orientation, i.e., crystal anisotropy. Using the contrast between the elastic and plastic properties of different directions within the a-Ti hcp lattice, the difference between residual elastic strains measured for (00.2) and (11.0) reflections was plotted, as well as the Fdifference strain_ between (00.2) and (10.1) reflections. These profiles show a good qualitative correlation with the plastic strain profile introduced by inelastic bending that was computed from the analysis of Pawley refinement of the energy-dispersive diffraction measurements.

show abstract

Rietveld refinements on laboratory energy dispersive X-ray diffraction (EDXD) data

Cited by 80 publications

References 27 publications

Mineralogical anatomy and implications of a Ti–Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite

Mineralogical anatomy and implications of a Ti–Sc-rich ultrarefractory inclusion from Sayh al Uhaymir 290 CH3 chondrite

CoAl2O4–mullite composites prepared by sol–gel processes

Measurement of Residual Elastic Strains in a Titanium Alloy Using High Energy Synchrotron X-Ray Diffraction

Contact Info

Product

Resources

About