The Structure of Crystalline Solids - Silicate Ceramics

6 important questions on The Structure of Crystalline Solids - Silicate Ceramics

Why are silicates not considered to be ionic?

The interatomic Si-O bond has a significant covalent character. Non the less the SiO44- tertrahedron has a formal charge of -4. Various structures can arise from this tetrahedron.
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What is the chemical formula and structure of silica?

SiO2 or silicon dioxide, where each corner of the tetrahedron is also the corner of an other tetrahedron.
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What are the three primary polycrystalline forms of silica?

Quartz, cristobalite and tridymite. With low densities and high melting points.
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What is fused silica?

Fused silica or vitreous silica is a form of noncrystalline silica with a high degree of atomic randomness.
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What are examples of network formers?

B2O3, GeO2 and SiO2
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What are layered silicates?

Sheets of (Si2O5)2- where the negative charge is associated with oxygen atoms sticking out and compensated with a second layer of cations.
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