Rhenium Trioxide
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High Quality Content by WIKIPEDIA articles! Rhenium trioxide (rhenium(VI) oxide, ReO3) is a red solid with a metallic lustre. It is the only stable trioxide of the Group 7 elements (Mn, Tc, Re). Rhenium oxide forms crystals with a primitive cubic unit cell, with a lattice parameter of 3.742 Å (374.2 pm). The structure of ReO3 is similar to the Perovskite structure (ABO3), without the large A cation at the centre of the unit cell. Each rhenium atom is surrounded by six oxygen atoms, forming a ReO6 octahedron. These octahedra share corners to form the 3-dimensional structure. Upon viewing a unit…mehr

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High Quality Content by WIKIPEDIA articles! Rhenium trioxide (rhenium(VI) oxide, ReO3) is a red solid with a metallic lustre. It is the only stable trioxide of the Group 7 elements (Mn, Tc, Re). Rhenium oxide forms crystals with a primitive cubic unit cell, with a lattice parameter of 3.742 Å (374.2 pm). The structure of ReO3 is similar to the Perovskite structure (ABO3), without the large A cation at the centre of the unit cell. Each rhenium atom is surrounded by six oxygen atoms, forming a ReO6 octahedron. These octahedra share corners to form the 3-dimensional structure. Upon viewing a unit cell of ReO3, one can see that it is composed of eight fragments of rhenium atoms, and twelve fragments of oxygen atoms. These numbers reduce to 1 Re and 3 O, hence the formula of ReO3. The coordination number of Re in this compound is 6 because each rhenium atom has six neighbouring oxygen atoms which bear opposite charge. The coordination number of O in this compound is 2 because each oxygen atom has 2 neighbouring Re atoms of opposite charge.