Formation of oriented silver telluride on single and polycrystalline Ag films

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Abstract

The formation, structure and morphology of silver telluride developed by the reaction of both (0 0 1) single or polycrystalline Ag films with subsequently vacuum deposited Te was investigated. Silver films 30-40 nm in thickness were deposited at 90-120°C onto water and chlorine treated, or, on carbon coated NaCl substrates. Tellurium was deposited at temperatures both below and above the monoclinic to FCC polymorphic phase transformation temperature (Tc = 145°C) of Ag2Te. The Ag-Te reaction occurred during the Te deposition. The samples were investigated by TEM, SAED and EDS: The Ag-Te compound developed at 200°C (above Tc) exhibited large oriented crystals of mainly monoclinic phase regardless of the substrate. Films developed at 115°C (below Tc) on the (0 0 1) Ag single crystal and on the randomly oriented Ag showed a monoclinic Ag2Te phase of oriented mosaic crystals and of random polycrystalline Ag2Te film, respectively. The influence of the polymorphic phase transition on the structure and morphology was revealed: As the random Ag-Te compound films passes Tc on cooling, during a heating-cooling cycle, nucleation and growth of a textured large grain monoclinic Ag2Te phase occurs attributed to the enthalpy difference of ΔH = 0.17 kcal/mol and minimisation of surface energy.

Original languageEnglish
Pages (from-to)299-305
Number of pages7
JournalVacuum
Volume71
Issue number1-2 SPEC.
DOIs
Publication statusPublished - May 9 2003

Keywords

  • Microstructure formation
  • Polimorphic phase transition
  • Solid-vapour phase reaction
  • TEM

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films

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