Materialprüfung mit Röntgenstrahlen

Glocker, R.

doi:10.1007/978-3-642-52744-9

Cited by 80 publications

(11 citation statements)

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“…If the 3D spots would be due to Pt-Ru alloys with varying composition, then -according to Vegard's rule [16] -the lattice constant would be expected to vary with the number of cycles of Pt electrodeposition. No change in the reciprocal lattice distance of the diffraction spots was observed, so that this possibility can be ruled out.…”

Section: Resultsmentioning

confidence: 99%

Spontaneous and Electrodeposition of Pt on Ru(0001)

Zei

Lei

Ertl

2003

Zeitschrift Für Physikalische Chemie

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Ruthenium / Spontaneous Pt Deposition / Methanol Electrooxidation / RHEED / SEMPt was deposited onto a Ru(0001) electrode from a PtCl 6 2− -containing HClO 4 solution either electrochemically or spontaneously (i.e. without external current flow). Composition, structure and morphology of the deposit were studied by means of Auger electron spectroscopy (AES), high energy electron diffraction (RHEED), and scanning electron microscopy (SEM). At first pseudomorphic growth of a 2D-Pt adlayer takes place, while with higher coverages 3D-clusters develop for which the most densely packed [011]-rows of the Pt(111) planes are parallel with the most densely packed [1120]-rows of the Ru(0001) substrate. These Ptclusters exhibit typical diameters between 2 and 10 nm, while their average mutual separation varies with the total amount of deposit. If compared with the bare Ru(0001) surface, the samples with Pt deposits exhibit considerably enhanced activity with respect to electrooxidation of formic acid or methanol.

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Section: Resultsmentioning

confidence: 99%

Spontaneous and Electrodeposition of Pt on Ru(0001)

Zei

Lei

Ertl

2003

Zeitschrift Für Physikalische Chemie

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“…The first one is the elastic anisotropy [1]. This is relating to the different of elastic constant according to {hkl} plane.…”

Section: Introduction * * * *mentioning

confidence: 99%

Diffraction Plane Dependence of Micro Residual Stresses in Uniaxially Extended Carbon Steels

et al. 2011

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In the stress measurement using X-ray or neutron diffraction, an elastic anisotropy as well as a plastic anisotropy of crystal must be carefully considered. In the X-ray and neutron diffraction stress measurement for polycrystalline materials, a particular {hkl} plane is used in measuring lattice strains. The dependence of an X-ray elastic constant on a diffraction plane is a typical example caused by an elastic anisotropy of the crystal. The yield strength and the work hardening rate of a single crystal depend on a crystallographic direction of the crystal. The difference in the yield strength and the work hardening rate relating to the crystallographic direction develops different residual stresses measured on each {hkl} diffraction after plastic deformation of a polycrystalline material. The present paper describes the result of the neutron stress measurement on uniaxially extended low and middle carbon steels. A tri-axial residual stress state developed in the extended specimens was measured on different kind of {hkl} diffraction plane. The measurement on the {110}, {200} and {211} diffraction showed that residual stresses increased with increasing the plastic elongation and the residual stresses on {110} were compressive, {200} were tensile and those on {211} were the middle of the former two planes.

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“…Therefore NAa/a must be smaller than 0.5 or ct* < 0.1. Glocker (1958) Warren & Averbach (1950). With the help of the Fourier transforms A ,10 and A220 of two reflections one can differentiate easily between microstresses and paracrystalline distortions.…”

Section: Objections To the Concept Of Paracrystalmentioning

confidence: 99%

Novel aspects of the real paracrystal

Hösemann¹,

Vogel²,

Weick³

et al. 1981

Acta Cryst Sect A

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A revision of the mathematical concept of paracrystals is proposed. Hermann's IZ. Electrochem. (1940), 46, 425-4361 early theory of mesophases represents a special case of a paracrystal where the statistical parameters introduced were merely crystalline or gas-like. The theory of paracrystals removes the black-white picture of crystalline and amorphous phases by introducing 18 new statistical parameters into conventional crystallography. It is shown that a real paracrystal can be defined by a three-dimensional convolution polynomial in combination with an empirically derived +t* law. Hence, a missing corner-stone of colloid science is established.

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Materialprüfung mit Röntgenstrahlen

Cited by 80 publications

References 0 publications

Spontaneous and Electrodeposition of Pt on Ru(0001)

Spontaneous and Electrodeposition of Pt on Ru(0001)

Diffraction Plane Dependence of Micro Residual Stresses in Uniaxially Extended Carbon Steels

Novel aspects of the real paracrystal

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