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Yb

Ytterbium广东快乐十分开奖结果 is a chemical element with the symbol Yb and atomic number 70. A soft silvery metallic element, ytterbium is a rare earth of the lanthanide series and is found in the minerals gadolinite, monazite, and xenotime. The element is sometimes associated with yttrium or other related elements and is used in certain steels. Natural ytterbium is a mix of seven stable isotopes.

Ytterbium is a soft, malleable and rather ductile element that exhibits a bright silvery luster. A rare earth element, it is easily attacked and dissolved by mineral acids, slowly reacts with water, and oxidizes in air.

Ytterbium has three allotropes which are called alpha, beta and gamma and whose transformation points are at −13 °C and 795 °C. The beta form exists at room temperature and has a face-centered crystal structure while the high-temperature gamma form has a body-centered crystal structure.

Normally, the beta form has a metallic-like electrical conductivity, but becomes a semiconductor when exposed to around 16,000 atm (1.6 GPa). Its electrical resistivity is tenfold larger at about 39,000 atm (3.9 GPa) but then drops dramatically, to around 10% of its room temperature resistivity value, at 40,000 atm (4 GPa).

Ytterbium is one of the lanthanides that is able to become divalent. Like the other potentially divalent lanthanides, samarium and europium, it is capable of being extracted into mercury by the use of sodium amalgam, which made it one of the easier lanthanides to purify using classical techniques. However, this divalency was not discovered until the 20th century.

TECHNICAL DATA
SymbolYbDensity (25 C)/gcm6.973
Atomic number70Melting point / °C824
No. of naturally occurring isotopes7Boiling point / °C-1427
Atomic weight173.04(+/-3)ΔHfus/kJmol-13.35
Outer electron configuration4f146s2ΔHvap/kJmol-1159
Metal radius(6-coordinate)/pm193.3ΔHf(monoatomic gas)/kJmol-1152
Ionic radius(6-coordinate)/pm III86.8ΔH(hydration Ln3+)/kJmol-13739
Ionic radius(6-coordinate)/pm II102Electrical resistivity (25 C)/μohm cm
Ionization energy/kJmol-1 I603E° (M3+(aq)\ + e→M2+(aq))/V28
Ionization energy/kJmol-1 II1175E° (M3+(aq)\ + 3e→M(s))/V-3.472
Ionization energy/kJmol-1 III2408

EVAPORATION TECHNIQUES
Temperature (oC) @Vap. PressureTechniquesRemarks
10-8 Torr10-6 Torr10-4 TorrElectron BeamCrucibleCoilBoat
520 Sublimes590 Sublimes690 SublimesGood--Tantalum



Yb
Evaporation Materials
Matierial SymbolAtomic Number     Thermal Conductivity         Theoretical Density 
W/m.Kg/cc
Yb ( pieces )Yb7034.96.98


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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