solid alpha Argon | SSHADE

Solid phase

Official name: solid alpha Argon

Name and identifiers

Secondary names: solid alpha-Ar; alpha-Ar
CAS number: 7440-37-1

Family: covalent network solid
Class: tridimentional covalent network solid
Compound type: elemental solid

Chemical composition

Formula: $Ar$
Chemical formula: Ar
Elemental formula: Ar
Isotope mixture type: terrestrial abundance

2.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Ar$	Argon	element	1	1.0	1	pure	main

Class: molecular solids with apolar molecules (01)
Type: with monoatomic apolar molecules (A) (01.01)

Associated phases

Equivalent liquid: Liquid Argon

Crystallography

Phase name: $\alpha$ -phase
Phase type: crystalline
Crystal system: isometric (cubic)
Crystal class: hexoctahedral
Crystal class symbol: m-3m (Oh)
Crystal spacegroup: Fm-3m

Physical properties

Molar mass: 39.948 $g/mol$
Density: 1.622 (83 K) - 1.77 (20K) ( $g/cm^3$

Thermodynamical properties

State NTP

gas

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid Ar	83.81 K (−189.34 °C)

Optical properties

Refringence type: isotropic
Refraction index $n_{\alpha}$: 1.265 (83.8K) - 1.307 (20 K) @578 nm
Pure color: colorless
Diaphaneity: transparent
Luster: vitreous

Links and Publications

Links

Wikipedia: Argon