Hydrothermal oxidation : a new chemical oxidation method to dope oxygen in La2CuO4+δ

A new oxidation method, chemical oxidation under hydrothermal conditions, is introduced to insert oxygen into La2CuO4 compounds. X-ray powder diffraction and magnetic susceptibility measurements show that the oxidized La2CUO4+delta With orthorhombic space group becomes a superconductor with a superconducting transition up to 42 K, which indicates the method is effective in inserting oxygen into La2CuO4. In addition, the oxidation mechanism and the unique properties of the closed system are discussed.