Synthetic amorphous silica | SSHADE

Solid phase

Official name: Synthetic amorphous silica

Name and identifiers

Secondary names: fused quartz; silica
CAS number: 7631-86-9

Family: covalent network solid
Class: glass
Compound type: silicate

Chemical composition

Formula: $SiO_2$
Chemical formula: SiO2
Elemental formula: Si O2
Isotope mixture type: terrestrial abundance

6.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Si$	Silicon	element	1	0.3333333333333333	1	pure	main
	$O$	Oxygen	element	2	0.6666666666666666	1	pure	main

Class: glasses (12)
Type: metal homonuclear glasses (elemental) (12.02)

Endmembers and polymorphs

Polymorphs

Synthetic beta quartz

Crystallography

Phase name: amorphous silica
Phase type: glassy
Crystal system: amorphous

Physical properties

Molar mass: 60.084 $g/mol$
Density: 2.196 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid	1713 °C (1986 K)

Optical properties

Refringence type: isotropic
Refraction index $n_{\alpha}$: 1.458
Pure color: colorless

Links and Publications

Links