beta Tantalum(V) oxide | SSHADE

Solid phase

Official name: beta Tantalum(V) oxide

Name and identifiers

Secondary names: Ditantalum pentaoxide; Tantalum pentoxide; beta Tantalum pentoxide; beta-Ta2O5
CAS number: 1314-61-0

Family: covalent network solid
Class: pseudometal (semi-conductor)
Compound type: oxide

Chemical composition

Formula: $\beta - Ta_2O_5$
Chemical formula: Ta2O5
Elemental formula: Ta2 O5
Isotope mixture type: terrestrial abundance

14.0

	Formula	Name	Family	Number min-max	Mole fraction	Isotope mole fraction	State	Relevance
	$Ta$	Tantalum	element	2	0.2857142857142857	1	constituent element	main
	$O$	Oxygen	element	5	0.7142857142857143	1	constituent element	main

Oxides composition

Oxides

Formula	$Ta_{2}O_{5}$
Mass fraction (%)	100.0

Class: pseudometals (14)
Type: homovalent bilayer pseudometals (14.02)

Crystallography

Phase name: L- or $\beta-Ta_2O_5$
Phase type: crystalline
Crystal system: orthorhombic
Crystal class: pyramidal
Crystal class symbol: mm2 (C2v)
Crystal spacegroup: Pmm2

Physical properties

Molar mass: 441.893 $g/mol$
Density: 8.18 $g/cm^3$

Thermodynamical properties

State NTP

solid

Phase transitions

Phase transition type	Other phases	Temperature - Pressure
solid-liquid	liquid Ta2O5	1872°C (2145 K)
solid-solid	H- or alpha-Ta2O5	1000 - 1360°C (1270 - 1630 K)

Optical properties

Refringence type: biaxial
Refraction index $n_{\alpha}$: 2.275
Pure color: colorless
Color: colorless, white
Diaphaneity: transparent to translucent

Links and Publications

Links

Wikipedia: Tantalum pentoxide