High pressure transformation of La₄Cu₃MoO₁₂ to a layered perovskite [5]

Perovskite structure can be stabilized through high pressure (HP) synthesis. To illustrate this, the HP synthesis of a new copper-rich layered perovskite, La₄Cu₃MoO₁₂, which is isotopic with La₂CuSnO₆ is discussed. When synthesized at ambient pressure, this perovskite forms a structure with remarkably low and unusual coordination of the constituents, which after treatment at high pressure and high temperature adopts new perovskite structure that contains unmixed copper-oxygen planes linked by mixed copper/molybdenum-oxygen planes.