Small-angle neutron scattering of alkali metals at moderate uniaxial pressure and low temperature

Maciej Krystian, Manfred Prem, Wolfgang Pichl, Gerhard Krexner

Veröffentlichungen: Beitrag in BuchBeitrag in Konferenzband

Abstract

This paper reports on the development of a cryostat for neutron small-angle scattering experiments on alkali metals under uniaxial compression in a temperature range from 5 K to room temperature. The investigation was motivated by earlier observations of 'premartensitic' anomalies in metallic lithium and potassium which seem to suggest that nuclei of a low-temperature phase might be generated in the undercooled bcc structure either by cooling alone or by additional mechanical deformation. Cooling to 120 K in lithium and to 5 K in potassium, respectively, without applied load produced only very slight changes in the SANS patterns. However, after uniaxial compression of 3% at these temperatures anisotropic scattering patterns developed, suggesting the formation of small particles embedded in the bcc matrix whose orientation is related to the deformation direction. Π2005 IOP Publishing Ltd.
OriginalspracheEnglisch
TitelInternational Workshop on Medium Pressure Advances for Neutron Scattering
Seiten3173-3178
Seitenumfang6
DOIs
PublikationsstatusVeröffentlicht - 2005

Publikationsreihe

ReiheJournal of Physics: Condensed Matter
Nummer40
Band17
ISSN0953-8984

ÖFOS 2012

  • 103015 Kondensierte Materie

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