Abstract

Abstract Large Mo 18 O 52 crystals are obtained by an appropriate crystallization method. The examination of their well developed surfaces by the use of reflection high energy electron diffraction (RHEED) proves that these are (100) surfaces stepped along [010] directions. It is concluded that this oxide surface conformation can be connected to the particular Mo 18 O 52 structure which is built up of MoO 3 slabs of finite width mutually joined by crystallographic shear planes (CS planes). Transmission electron microscopy (TEM) analysis from Mo 18 O 52 crystal flakes confirms that these are single crystals without disorder in the periodicity of the CS planes.

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