We report a scanning tunneling microscopy study on the SrTiO3(110) surface treated with Ar+ sputtering followed by annealing. Two types of termination coexist on the surface, which are spatially identified as the 4×1 reconstructed SrTiO layer and the O layer covered by Ti-rich oxide clusters, respectively. The relative areal ratio of the two types is tuned by sputtering dose reproducibly, and monophased surface with either SrTiO or O termination is obtained. The surface is stable at temperatures up to 1100°C and under oxygen partial pressures from 6×105mbar to ultra high vacuum, providing us a flexible epitaxial growth template.

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