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Framework contraction in Na-stuffed Si(cF136).

Matt Beekman1, Emmanuel N Nenghabi, Koushik Biswas

  • 1Department of Physics, University of South Florida, Tampa, Florida 33620, USA.

Inorganic Chemistry
|May 28, 2010
PubMed
Summary
This summary is machine-generated.

Introducing sodium (Na) into silicon clathrate II (Si(cF136)) cages causes lattice contraction when filling Si(28) cages, but lattice expansion when filling Si(20) cages. This nonmonotonic response reveals distinct guest-framework interactions.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Crystallography

Background:

  • Silicon clathrates are promising materials for thermoelectric applications.
  • Understanding guest-framework interactions is crucial for tuning clathrate properties.
  • The structure of silicon clathrate II (Si(cF136)) consists of Si(20) and Si(28) cages.

Purpose of the Study:

  • To investigate the structural response of silicon clathrate II to sodium (Na) guest incorporation.
  • To elucidate the differing guest-framework interactions within Si(20) and Si(28) cages.
  • To correlate structural changes with the extent and location of Na filling.

Main Methods:

  • Systematic crystal structure refinements using powder X-ray diffraction (PXRD) data.
  • First-principles density functional theory (DFT) calculations.
  • Analysis of guest occupancy in different cage types (Si(20) and Si(28)).

Main Results:

  • Introduction of Na solely into Si(28) cages leads to a lattice contraction of Si(cF136).
  • Subsequent filling of Si(20) cages with Na results in a contrasting lattice expansion.
  • The nonmonotonic structural behavior indicates dissimilar Na-framework interactions in Si(20) vs. Si(28) cages.

Conclusions:

  • The structural response of silicon clathrate II to guest filling is highly dependent on the specific cage type occupied.
  • Distinct guest-framework interactions govern the observed lattice contraction and expansion.
  • This finding provides fundamental insights into the design principles for functional clathrate materials.