Materials Literature
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By using TEM and X‐ray diffraction, the domain structure in ceramic LaNbO 4 has been studied. It has been found that the domains have two different orientations, separated by a boundary with_irrational Miller indexes between (20) I / (402) II and (20) I /(602) II lattice planes, which is in good agreement with the bou…
Structure factors for small, hydrothermally grown samarium orthoferrite, SmFeO 3 , were measured with focused λ = 0.7 Å synchrotron radiation. Approximate high symmetry in the Δρ images indicates that cations deform the electron density far more strongly than the O atoms. The most obvious effect is on distribution of…
Abstract Pore-lining chlorite is common in Rotliegend lake shoreline aeolian sandstones from northern Germany and preserves abnormally high primary intergranular porosity. In the north of the study area, in a basinward direction, the chlorites are Mg-rich while towards the south they become Fe-rich over a distance of…
Abstract A quantification technique useful in analysis of clay-rich deposits containing sepiolite and/or palygorskite has been developed by combining diffractometric and chemical data and represents a considerable improvement on classic quantification based on X-ray diffraction. The required data are: intensity ratios…
Abstract The control of the morphology of an immiscible polymer melt is of vital importance for the mastering of the final properties of the product. As polymer blends are produced using corotating twin‐screw extruders, understanding and modeling the changes experienced by the blend during this process is of great int…
Abstract The deposition of electron beam‐induced specimen contamination in both the transmission (TEM) and scanning electron microscopes (SEM) has remained a problem since the beginning of these forms of microscopy. Generally, sources of SEM contamination can be attributed to one or a combination of three major contri…
The magnetocrystalline anisotropy energy of Y${\mathrm{Co}}_{5}$ has been calculated from first principles using the local-spin-density approximation. The easy magnetization axis is predicted correctly and the anisotropy energy is only 20% smaller than the experimental value if a recently proposed orbital polarization…
As part of an effort to understand the mechanisms of light-induced effects in a-Al2O3:C the phototransferred thermoluminescence (PTTL) peaks at ~260 K and at ~450 K have been monitored as a function of the time of illumination, the temperature to which the sample is heated between irradiation and illumination, the wav…
Abstract Single crystals of β‐Ga 2− x In x O 3 with x = 0 to 0.2 have been grown by the float zone technique using radiation heating. When x increases from 0 to 0.2, the interionic distance O‐Ga in the gallium octahedron and tetrahedron increase on the average by 1 to 1.5% and, as a consequence, the position of the st…
A new liquid crystalline photoconductor, 2-(4'-heptyloxyphenyl)-6-dodecylthiobenzothiazole exhibiting a smectic A (SmA) phase between 90° C and 100° C was synthesized and its photoconductive behavior was characterized by steady-state current-voltage measurements under ultraviolet illumination. A large photocurrent wit…
Abstract Crystallization Analysis Fractionation is a new technique for the analysis of composition distribution in semicrystalline polymers; more specifically for the analysis of branching distribution in Polyethylene and tacticity in Polypropylene type resins. CRYSTAF as well as TREF (Temperature Rising Elution Fract…
A determination of stacking fault energy (SFE) of the austenite phase of a duplex stainless steel, material no. 1.4462, has been carried out using transmission electron microscopy (TEM). Furthermore, cold rolling tests and microstructural analysis have been realized in order to allow a detailed discussion of the obtai…
Abstract The tripeptide glutathione (γ‐ L ‐Glu‐ L ‐Cys‐Gly, GSH) is thought to play an important role in the pharmacology of bismuth drugs, but to our knowledge no chemical studies of bismuth glutathione complexes have been reported. We report here studies of interactions of the antiulcer compound ranitidine bismuth c…
Pressure-induced amorphous-phase transitions (amorphization) have been observed in framework silicates like quartz and feldspars. A similar crystalline to highly disordered solid phase transition is reported in this study for two zeolites, scolecite and mesolite. Pressure-induced amorphization is demonstrated using in…
Removal of oxygen ions by thermogravimetric methods in $\mathrm{CaMn}{\mathrm{O}}_{3\ensuremath{-}\ensuremath{\delta}}$ ($0<~\ensuremath{\delta}<~0.34$) produces electron doping of the material and ${\mathrm{Mn}}^{4+}$ ions are reduced to a trivalent state. Electrical resistivity measurements in samples with con…
The crystalline structure of dried cotton fibers at varying development stages has been investigated using wide angle x-ray diffraction (WAXS) techniques. The cellulose I crystalline structure has been confirmed on dried SJ-2 Acala cotton fibers collected at varying developmental stages and at maturity. The cellulose…
The microstructures of lithiated graphite were studied using high‐resolution transmission electron microscopy (HRTEM) and x‐ray diffraction (XRD). HRTEM shows lattice images of the (001) layers of with layer spacing of 3.70 Å, consistent with XRD. The morphology and distribution of the and phases were investigated by…
The differential, total, and transport cross sections for electrons and positrons impinging on free atoms and solid targets have been calculated in the energy range of 100–5000 eV. As an application, the mean number of the wide angle collisions suffered by the particle before slowing down to rest and the backscatterin…
Abstract Prograde evolution of illite/smectite occurring in an unusually-thick (8000 m) sequence of Mesozoic-Cenozoic sediments in the Basque-Cantabrian Basin, Spain, has been studied using XRD and TEM/AEM. The sediments, which are only slightly tilted, cover the range from smectite to illite, and the most deeply buri…
Structural parameters and their thermal changes in natural magnetite, Fe 3 O 4 , have been studied using the single-crystal X-ray diffraction method in the temperature range 126–773 K. The cell dimensions, oxygen coordinate and atomic mean square displacements (m.s.d.'s) reversibly change as a function of temperature.…