Determination of grain size and lattice distortions in ground YBa2Cu3O7

Lönnberg, Bertil; Lundström, Torsten

doi:10.1007/bf01117612

Cited by 12 publications

(7 citation statements)

References 7 publications

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“…Most commonly the crystallite size is determined by the Scherrer formula. 31 However, this technique only takes account of the effect of the small size but neglects the strain effect, thus the result is only useful for considering trends in the change of crystallite size with milling conditions. Considering a combination of both crystallite size and lattice strain, the relationship between the peak width and the two effects is governed by following equation: 32 where B is the peak width at half the maximum intensity, θ is the Bragg angle, d is the crystallite size, λ is the wavelength of the X-radiation used, and η is the strain.…”

Section: Resultsmentioning

confidence: 99%

Mg-Based Nanocomposites with High Capacity and Fast Kinetics for Hydrogen Storage

Yao

et al. 2006

J. Phys. Chem. B

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Magnesium and its alloys have shown a great potential in effective hydrogen storage due to their advantages of high volumetric/gravimetric hydrogen storage capacity and low cost. However, the use of these materials in fuel cells for automotive applications at the present time is limited by high hydrogenation temperature and sluggish sorption kinetics. This paper presents the recent results of design and development of magnesium-based nanocomposites demonstrating the catalytic effects of carbon nanotubes and transition metals on hydrogen adsorption in these materials. The results are promising for the application of magnesium materials for hydrogen storage, with significantly reduced absorption temperatures and enhanced ab/desorption kinetics. High level Density Functional Theory calculations support the analysis of the hydrogenation mechanisms by revealing the detailed atomic and molecular interactions that underpin the catalytic roles of incorporated carbon and titanium, providing clear guidance for further design and development of such materials with better hydrogen storage properties.

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Section: Resultsmentioning

confidence: 99%

Mg-Based Nanocomposites with High Capacity and Fast Kinetics for Hydrogen Storage

Yao

et al. 2006

J. Phys. Chem. B

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“…Taking into consideration the fact that in the analysis results for the surrounding host rocks in FZB1136 and for all samples in FZB1194 and FZB1243, almost 100 wt.% of the samples were fitted by standard patterns, the size of the unfitted component, 34.5 wt.%, of the PSZ sample suggests the presence of a material with no or weak diffraction intensity. In accordance with the Scherrer equation, weak diffraction intensity of minerals is generally attributed not only to lattice distortions but also to reductions of particle size to the submicrometer to nanometer range [e.g., Lönnberg and Lundström , ]. However, not only these factors but also the presence of an amorphous surface layer, called the Beilby layer, with a thickness of 30–60 nm [ Gibb et al ., ] can contribute to weak intensity in the case of damaged quartz.…”

Section: Discussionmentioning

confidence: 99%

Mineral assemblage anomalies in the slip zone of the 1999 Taiwan Chi-Chi earthquake: Ultrafine particles preserved only in the latest slip zone

Hirono

Kameda

Kanda

et al. 2014

Geophys. Res. Lett.

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“…Furthermore, large amount of well-rounded spheroidal ultrafine particles ranging in size from submicrometer to several tens of nanometers, were observed only in the black gouge ( Figure 5). Because weak X-ray diffraction intensity of minerals could be attributed not only to lattice distortions but also to reductions of particle size to the submicrometer to nanometer range (e.g., Lönnberg and Lundström 1994), the 'missing' mineral content in the XRD analysis of black gouge sample FZ06 could be attributed to the observed ultrafine particles. Sun and McDonough (1989).…”

Section: Discussionmentioning

confidence: 99%

Geochemical and mineralogical characteristics of fault gouge in the Median Tectonic Line, Japan: evidence for earthquake slip

et al. 2014

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We carried out geochemical and mineralogical analyses on fault-zone rocks from the Anko section of the Median Tectonic Line in Nagano Prefecture, Japan, to investigate coseismic physicochemical processes in the fault zone. The latest fault zone in the Anko section contains cataclasite, fault breccia, and fault gouge of granitic composition, and brecciated basic schist. Protoliths of the granitic composition are from the Ryoke metamorphic belt and those of the basic schist from the Sambagawa metamorphic belt. X-ray diffraction analyses show a selective decrease of clay minerals coupled with an increase of amorphous phase in an intensely deformed layer of black gouge (5-to 10-cm thick). SEM observation reveals that the black gouge is characterized by a drastic reduction of grain size and abundant ultrafine particles of submicrometer to several tens of nanometers with well-rounded spheroidal shapes. These observations for the black gouge are indicative of strong mineral lattice distortion and granulation associated with earthquake slip. Geochemically, the black gouge is characterized by distinctly higher Li content and 87 Sr/ 86 Sr isotope ratio than surrounding cataclasites, breccias, and gouges, which have similar major element compositions. Model analysis reveals that the trace element composition of the black gouge is consistent with high-temperature (up to 250°C) coseismic fluid-rock interactions. Thermal and kinetic constraints indicate that there have been repeated slips on the fault at moderate depths (e.g., 600 m), although the tectonic process by which the fault zone has been uplifted and exposed in this area is not well understood.

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Determination of grain size and lattice distortions in ground YBa2Cu3O7

Cited by 12 publications

References 7 publications

Mg-Based Nanocomposites with High Capacity and Fast Kinetics for Hydrogen Storage

Mg-Based Nanocomposites with High Capacity and Fast Kinetics for Hydrogen Storage

Mineral assemblage anomalies in the slip zone of the 1999 Taiwan Chi-Chi earthquake: Ultrafine particles preserved only in the latest slip zone

Geochemical and mineralogical characteristics of fault gouge in the Median Tectonic Line, Japan: evidence for earthquake slip

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