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Structure of a perovskite with a chemical formula ABX 3.The red spheres are X atoms (usually oxygens), the blue spheres are B-atoms (a smaller metal cation, such as Ti 4+), and the green spheres are the A-atoms (a larger metal cation, such as Ca 2+).Pictured is the undistorted cubic structure; the symmetry is lowered to orthorhombic, tetragonal or trigonal in many perovskites.
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