Ordnungszahl: |
67 |
Name: |
Holmium |
Namensursprung: |
From Holmia, the Latinized name for Stockholm, Sweden. |
Entdeckung: |
1878 by J.L. Soret in Switzerland |
Beschreibung: |
Fairly soft, malleable, lustrous, silvery metal. |
Vorkommen: |
Occurs in gadolinite. Most often from monazite which is often 50% rare earth and typically 0.05% holmium. |
Verwendung: |
It has very few practical applications; however, it
has some unusual magnetic properties that offer some hope for future
applications. |
Gruppe: |
Actinide Metal |
Atomgewicht: |
164.93032 |
Schmelzpunkt: |
1474°C |
Siedepunkt: |
2700°C |
Dichte bei 293 K: |
8.80 g/cm³ |
Aggregatszustand bei Raumtemperatur: |
Solid |
Schalen: |
2,8,18,29,8,2 |
Orbitale: |
[Xe] 4f11 6s2 |
Valenzen: |
3 |
1. Ionisierungs- potential: |
6.0216 V |
2. Ionisierungs- potential: |
11.805 V |
3. Ionisierungs- potential: |
22.843 V |
Atomradius: |
2.47 Å |
Spezifische Wärme: |
0.16 J/gK |
Verdampfungswärme: |
241.0 kJ/mol |
Schmelzwärme: |
12.20 kJ/mol |
Thermischer Ausdehnungskoeffizient: |
9.8 10-6 K-1 |
Röntgenemission Energie / Wellenlänge: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
eV |
0 |
0 |
6720.08 |
7525.67 |
1347.67 |
1382.99 |
|
|
|
Å |
0 |
0 |
1.845 |
1.6475 |
9.19998 |
8.96503 |
|
|
|
|
Röntgenabsorption Energie / Wellenlänge: |
|
K |
L-I |
L-II |
L-III |
M-I |
M-II |
M-III |
M-IV |
M-V |
eV |
55615 |
9394 |
8918 |
8071 |
2129 |
1923 |
1742 |
1392 |
1352 |
Å |
0.22293 |
1.31984 |
1.39028 |
1.53618 |
5.82364 |
6.4475 |
7.11742 |
8.907 |
9.17052 |
|
Röntgen Fluoreszenz Ausbeute: |
|
KA |
KB |
LA |
LB |
MA |
MB |
|
|
|
|
94.3% |
0% |
23.1% |
0% |
0% |
0% |
|
|
|
|
Nuklide: |
|
Anteil |
Gewicht |
Spin |
Halbwertszeit |
Zerfallsmodus |
Ho163 |
0% |
163 |
7/2 |
4.57E03y |
EC |
Ho165 |
100% |
164.93 |
7/2 |
|
Stable |
Ho166 |
0% |
166 |
0 |
1.117d |
β- |
Ho166m |
0% |
166 |
7 |
1.2E03y |
β- | |