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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
SymbolCrIonic radius(6-coordinate)/pm IV55
Atomic number24Density (20°C)/gcm-37.14
No. of naturally occurring isotopes4Melting point / °C1900
Atomic weight51.996Boiling point / °C2690
Electronic configuration[Ar]3d54s1ΔHfus/kJmol-121 (+/-2)
Ionization energy/kJmol -1653ΔHvap/kJmol-1342 (+/-6)
II1592ΔHf(monoatomic gas)/kJmol-1397 (+/-3)
III2987Electrical resistivity
Metal radius(12-coordinate)/pm128(20°C)/ μohm cm13
Ionic radius(6-coordinate)/pm VI44Electronegativity χ1.6
Ionic radius(6-coordinatc)/pm V49

EVAPORATION TECHNIQUES
Temperature (oC) @Vap. PressureTechniquesRemarks
10-8 Torr10-6 Torr10-4 TorrElectron BeamCrucibleCoilBoat
837 Sublimes977 Sublimes1157 SublimesGoodVitreous GraphiteTungstenCr plated rod or stripFilms very adherent. High rates possible. Cr plated rods are ideal for depositing Cr.



Cr
Precision Alloys
AlloyDin SymbolElectrical Resistivity at 20°C     Conductivity  Density   
                 μΩ/Cm         S/W      g/cm3
NEXOHM®NiCr20AlSi1320.768
NEXTMNC6015NiCr60151110.908.2
NEXTMNC8020NiCr80201080.938.3
NEXTMNC3020NiCr30201040.967.9
NEXTMCC0.3CuCr0.31.92-8.9

Thermo-electric Alloys
Model No.Symbol Melting Point                 Temp ToleranceTemp Range
°C                            °C 
KPNi, Si, Fe,Cr1430±2.2°C or ±0.75% (t90)0 to 1260
NPNi, Si, Cr1394±2.2°C or ±0.75% (t90)0 to 1260
EPNi, Si, Fe,Cr1430±1.7°C or ±0.5% (t90)0 to 870
KPXNi, Si, Fe,Cr1430±2.2°C0 to 200
NPXNi, Si, Cr1394±2.2°C0 to 200
EPXNi, Si, Fe, Cr1430±1.7°C0 to 200






Sputtering Targets
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
Chromium_CrCr24947.2

Evaporation Materials
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
Cr ( pieces )Cr24947.2



Below is the periodic table of chemical elements。The elements in red are the ones Nexteck's product contain。 Click them, you will come to the details。

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