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This paper reports a study on the mechanical and tribological properties of ab- and a (b) c−planes of YBa2Cu3O7−δ single crystals. The single crystals were grown using a CuO-BaO self-flux method. The oxygenation effect on the mechanical and tribological properties of ab- and a (b) c−planes is reported. For the ab- plane, the hardness and elastic modulus were around 6 and 50 GPa, respectively. In this...