ZIB

Hits per page

hits 1 - 2 | 2 hits

Sorting

Electronic Resource

Thermal stability of Mo–V epitaxial multilayers (1999)

Dudás, A. ; Langer, G. A. ; Beke, D. L. ; [et al.]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 86 (1999), S. 2008-2013

add to mindlist on the mindlist

Details

ISSN: 1089-7550

Source: AIP Digital Archive

Topics: Physics

Notes: By use of transmission electron microscopy and x-ray diffraction the degradation of the structure of epitaxial crystalline Mo–V multilayers has been studied during annealing between 1000 and 1250 K. In low vacuum (10−4 mbar), first, a polygonization (driven by the elastic mismatch due to the oxidation of V) took place, which led to a grain size in the order of the thickness of the individual layers (i.e., 1–2 nm). At longer annealing times, a partial recrystallization of Mo—parallel with a grain-boundary assisted discontinuous structural transformation—was observed. The (200) texture was preserved during the degradation process. At low temperatures and in low vacuum, this process was fast, while with improving the vacuum (up to 10−7 mbar) the polygonization was slower and above 1200 K the bulk diffusion controlled intermixing was observed with a final state of completely homogeneous solid solution. © 1999 American Institute of Physics.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.371001

Permalink

Library	Location	Call Number	Volume/Issue/Year	Availability

Others were also interested in ...

Paper (German National Licenses)

Fulltext

Electronic Resource

Starpolymers by soft-hard-soft block copolymers (1997)

Kéki, S. ; Bogács, C. ; Bogács, L. ; [et al.]

Weinheim : Wiley-Blackwell

Angewandte Makromolekulare Chemie 245 (1997), S. 183-191

add to mindlist on the mindlist

Details

ISSN: 0003-3146

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Physics

Description / Table of Contents: Es wird über eine neuartige Synthese für Sternpolymere aus einem Weich-hartweich-Triblockcopolymeren berichtet. Das Dreiblock-Copolymere wurde durch insitu-Addition von Isobuten (IB) zu einer mit Dicumylchlorid/TiCI4/Pyridin initiierten lebenden Polymerisation von Styrol (S) erhalten. Untersuchungen mittels Transmissionselektronenmikroskopie und Differentialkalorimetrie zeigen eine Mikrophasenseparation des PIB-PS-PIB-Copolymeren. Durch Umsetzung des Triblock-Copolymeren mit CCI4 in Gegenwart von AICI3 wurde das Sternpolymere erhalten, dessen Anzahl der Arme mittels Größenausschlußchromatographie zu 20 bestimmt wurde.

Notes: A novel synthesis of starpolymers from a soft-hard-soft triblock has been reported. The triblock was obtained by adding isobutene (IB) “in situ” to the living styrene (S) polymerization mixture initiated by the p-dicumylchloride/TiCl4/pyridine system. Microphase separation was observed by transmission electron microscopy and differential scanning calorimetry. Treatment of the PIB-PS-PIB triblock with CCI4 in the presence of AICI3 led to the starpolymer and the number of arms was estimated by size-exclusion chromatography to be 20.

Additional Material: 5 Ill.