Small-angle neutron scattering measurements of deuteride (hydride) formation and decomposition in single-crystal Pd

W. C. Chen, Brent J. Heuser

Research output: Contribution to journalArticlepeer-review

Abstract

The deuteride (hydride) precipitation and decomposition microstructure in single-crystal Pd has been investigated in a series of in situ small-angle neutron scattering (SANS) measurements. The particle morphology along the absorption and desorption branches of the 353-K pressure-composition isotherm are consistent with a loss of particle coherency, leading to the formation of large, micron-thick plates. The loss of coherency coincides with the system entering the miscibility gap, an observation that suggests irreversible dislocation formation in part drives the hysteretic behavior of the Pd-D (-H) system. SANS analysis further indicates that the decomposition process is characterized by a much higher particle dispersion, with a factor of 40 greater surface-to-volume ratio of the precipitating phase. This we attribute to a more heterogeneous transformation process, presumably at dislocations formed during initial deuteride formation.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number1
DOIs
StatePublished - 2002

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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