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Under the high pressure conditions of the Mantle the Pyroxene Enstatite , MgSiO3, is a perovskite Polymorph and may be the most common mineral in the Earth. It is also the name of a more general group of crystals which take the same Structure . See Perovskite Structure for details. The basic chemical formula follows the pattern ABO3, where A and B are Cation s of different sizes (for example, LaMnO3).The idealized structure is primitive cube, but differences in ratio between the A and B cations can distort the structure to a number of different so-called distortions, of which tilting is the most common one. The A cation is the cation in the middle of the cube and B is on the corners. The oxygen is in the middle of the edges. There also double-perovskites for which there are two different B cations, which are ordened. Their ideal structure is a face side centred cube, with the edges extended twice the size of the original cell. The perovskite structure shares the property of Ferroelectricity with Garnet and Olivine . Many Superconducting Ceramic materials have perovskite-like structures. SEE ALSO |
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