Erbium
Irene Kramer-Schwenk
Chemie, Physikalische Chemie, Er, Element der Gruppe der Lanthanoide des Periodensystems, Ordnungszahl 68. Erbium besitzt die Elektronenkonfiguration [Xe]4f126s2 und kommt in der Natur in sechs Isotopen vor (Tabelle 1). [AFM]
Erbium 1: Wichtige Isotope.
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Isotop |
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Natürliche |
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Atommasse |
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Halbwerts- |
|
162Er |
0,14 |
161,928787 |
stabil |
|
164Er |
1,56 |
163,929211 |
stabil |
|
166Er |
33,4 |
165,930305 |
stabil |
|
167Er |
22,9 |
166,932061 |
stabil |
|
168Er |
27,1 |
167,932383 |
stabil |
|
169Er |
0 |
168,934588 |
9,4 d |
|
170Er |
14,9 |
169,935476 |
stabil |
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171Er |
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0 |
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170,938027 |
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7,52 h |
Erbium 2: Allgemeine, chemische und festkörperphysikalische Eigenschaften.
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relative Atommasse (12C = 12,0000) |
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167,26 |
|
Dichte [g cm-3] |
9,045 |
|
Molvolumen [cm3] |
18,44 |
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Oxidationszahl |
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III |
Erbium 3: Thermische und elektromagnetische Eigenschaften.
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Siedetemperatur [K] |
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2783 |
|
Schmelztemperatur [K] |
1795 |
|
Siedeenthalpie [kJmol-1] |
281 |
|
Schmelzenthalpie [kJmol-1] |
17,2 |
|
Wärmeleitfähigkeit [Wm-1K-1] |
14,3 |
|
spezifische Wärme [kJkg-1K-1] |
0,168 |
|
thermischer Längenausdehnungskoeffizient [10-6 K-1] |
9,2 |
|
spezifischer Widerstand [10-8 Wm] |
87 |
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spezifische magnetische Suszeptibilität [10-6 kg-1m3] |
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3,33 |
Erbium 4: Atom- und kernphysikalische Eigenschaften.
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Termsymbol |
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3H6 |
|
1. Ionisierungsenergie [eV] |
6,108 |
|
2. Ionisierungsenergie [eV] |
11,93 |
|
Elektronenaffinität [eV] |
<0,5 |
|
Elektronegativität (Pauling) |
1,24 |
|
effektive Kernladung (Slater) |
2,85 |
|
Ionenradius (Er3+) [nm] |
0,088 |
|
Kovalenzradius [nm] |
0,157 |
|
Atomradius [nm] |
0,1757 |
|
Kernspin (167Er) |
7/2 |
|
kernmagnetisches Moment [mK] (167Er) |
-0,564 |
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Einfangquerschnitt
für thermische Neutronen [barn] |
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0,16±0,03 |
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