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Controlling crystal surface termination by cleavage direction.

M Plomp1, W J van Enckevort, E Vlieg

  • 1RIM Laboratory of Solid State Chemistry, University of Nijmegen, Toernooiveld 1, 6525 ED Nijmegen, the Netherlands.

Physical Review Letters
|June 1, 2001
PubMed
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Potassium bichromate (K(2)Cr(2)O(7)) crystal cleavage reveals controllable surface terminations. The crystal

Area of Science:

  • Materials Science
  • Crystallography
  • Surface Science

Background:

  • Potassium bichromate (K(2)Cr(2)O(7)) exhibits a double-layered AB structure along the [001] direction.
  • Understanding crystal cleavage is crucial for controlling surface properties.

Purpose of the Study:

  • To investigate the cleaving behavior of potassium bichromate crystals.
  • To determine if surface termination can be controlled during cleavage.

Main Methods:

  • Atomic force microscopy (AFM) was employed to study crystal cleavage.
  • Cleavage was performed along the [001] plane in <100> directions.

Main Results:

  • Cleavage along the [001] plane results in surfaces with either A or B termination.

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  • The specific termination (A or B) is dependent on the cleavage direction ([100] or [*100]).
  • One of the two possible terminations is metastable and undergoes reconstruction to a stable state.

    • Conclusions:

    • The surface termination of potassium bichromate crystals can be controlled by the macroscopic direction of cleavage force.
    • This control over termination offers possibilities for tailoring crystal surface properties.