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Crystal Structure of Silicon dioxide

Jun 24,2024

Silicon dioxide is a ubiquitous metal oxide widely used as a refractory, coating and nanocomposite material. Its silica nanoparticles are used in various fields such as catalysts, pigment stabilisation, modified concrete, electronics and sensors.

SiO2 is a polycrystalline compound, and all crystalline forms except wolframite and fibrous silica are tetrahedral SiO4 units joined together in different arrangements by sharing vertices. The length of the SiO4 bonds varies from crystal form to crystal form. E.g., quartz (α) structure of SiO?, crystallising in the P3_221 tripartite space group.Si?? bonds with four equivalent O2 atoms to form the co-angled SiO? tetrahedron.The Si-O bond lengths have two shorter (1.61 ?) and two longer (1.62 ?) lengths.O2 bonds in a curved 150-degree geometry to two equivalent Si?? atoms.O2 bonds with two equivalent Si?? atoms.O2 bonds with two equivalent O2 atoms. - O2 is bonded to two equivalent Si?? atoms in a bent geometry using a 150 degree bend.

α-tridymite structure of Silicon dioxide

In addition, SiO? also has a high (β)-Christobalite structure, crystallising in the cubic Fd?3m space group. Si?? is bonded to four equivalent O2 atoms to form the co-angled SiO? tetrahedra. O2- is bonded to two equivalent Si? ? atoms bonded in a linear geometry using.

β-Christobalite structure of Silicon dioxide

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