Abstract
Irreversible thermal reconstruction of vacuum-annealed MnO(100)−(1×1) to (2×2) and (6×6) structures has been observed with LEED with transition temperatures of 800 and 1000 K, respectively. The relatively weak (2×2) structure does not always precede (6×6) reconstruction and in particular is inhibited by the presence of small amounts of calcium impurities. The reconstructions occur with no detectable change in stoichiometry as measured by AES and XPS. The data are in general agreement with rumpling of surface oxygen as predicted by several theoretical studies of ionic crystal lattice stability.
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