Home Materials » Metals » Chromium, Cr

Chromium, Cr

Chromium is a chemical element which has the symbol Cr and atomic number 24. It is a steel-gray, lustrous, hard metal that takes a high polish and has a high melting point. It is also odourless, tasteless, and malleable.

Technical Data
Symbol	Cr	Ionic radius(6-coordinate)/pm IV	55
Atomic number	24	Density (20°C)/gcm^-3	7.14
No. of naturally occurring isotopes	4	Melting point / °C	1900
Atomic weight	51.996	Boiling point / °C	2690
Electronic configuration	[Ar]3d⁵4s¹	ΔH_fus/kJmol^-1	21 (+/-2)
Ionization energy/kJmol ^-1	653	ΔH_vap/kJmol^-1	342 (+/-6)
II	1592	ΔH_{f(monoatomic gas)/}kJmol^-1	397 (+/-3)
III	2987	Electrical resistivity
Metal radius(12-coordinate)/pm	128	(20°C)/ μohm cm	13
Ionic radius(6-coordinate)/pm VI	44	Electronegativity χ	1.6
Ionic radius(6-coordinatc)/pm V	49

Evaporation Techniques
Temperature (^oC) @Vap. Pressure			Techniques				Remarks
10^-8 Torr	10^-6 Torr	10^-4 Torr	Electron Beam	Crucible	Coil	Boat	Remarks
837 Sublimes	977 Sublimes	1157 Sublimes	Good	Vitreous Graphite	Tungsten	Cr plated rod or strip	Films very adherent. High rates possible. Cr plated rods are ideal for depositing Cr.

Evaporation Materials
C6-5000-M cubes 6mm x 6mm x 6mm
C6-5001-M flakes
C6-5002-M pellets 6mm diameter x 6mm long
C6-5007-M pieces 2-4.7mm
C6-5008-M pieces 3-6mm
C6-5009-M pieces 3-12mm
C6-5010-M pieces <25mm
C6-5016-M pieces 1-3mm
C6-5019-M pieces 3-5mm

Powder
C6-10000-P -60 mesh
C6-10001-P -100 mesh
C6-10004-P -200 mesh
C6-10006-P -325 mesh

Rods
C6-2000-R 0.125" (3.175mm)
C6-2001-R 0.250" (6.35mm)
C6-2002-R 0.500" (12.7mm)
C6-2003-R 2mm
C6-2004-R 10mm

Our company

My account

Testbourne Ltd
Unit C, The Loddon Centre
Wade Road
Basingstoke
Hampshire. RG24 8FL, England, UK

+44 (0)1256 467055

+44 (0)1256 362955

info@testbourne.com

Testbourne offers an ISO9001 quality assured service to companies across a wide market area from R&D through to on-line production. Our company objective is to provide a fast, efficient and personalised service, with full technical support to all our customers.