期刊
PHYSICAL REVIEW LETTERS
卷 90, 期 4, 页码 -出版社
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.90.046104
关键词
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We use low-energy electron microscopy to show that changing the temperature of oxygen-deficient, rutile-structure crystals causes steps on the (110) surfaces to move. This motion occurs because the concentration of bulk oxygen vacancies changes with temperature, requiring that material be added to or subtracted from the surface. During cooling below a bulk-stoichiometry-dependent temperature, the surface reconstructs into a 1x2 structure in the regions surface steps have swept through, showing that the structural and compositional changes needed to form the 1x2 phase are facilitated by the surface-to-bulk mass flow.
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