The Wiedemann-Franz (o) for metals: σ the Lorenz number for the following metals and prove the validity of the Wiedemann-Franz law. Metall Al Cu Zn Ag law predicts a linear relationship between thermal (A) and electronic conductivity LT. Hereby, L is the Lorenz number: L = = 2.44 · 10−8 WN/K². Calculate (25 °C) W/K cm 2.37 4.01 1.16 4.29 p(25 °C) us cm 2.71 1.73 6.04 1.62 Metall W Pt Au Pb A(25 °C) W/Kcm 1.73 0.716 3.18 0.353 P(25 °C) us cm 5.65 10.81 2.40 20.99
The Wiedemann-Franz (o) for metals: σ the Lorenz number for the following metals and prove the validity of the Wiedemann-Franz law. Metall Al Cu Zn Ag law predicts a linear relationship between thermal (A) and electronic conductivity LT. Hereby, L is the Lorenz number: L = = 2.44 · 10−8 WN/K². Calculate (25 °C) W/K cm 2.37 4.01 1.16 4.29 p(25 °C) us cm 2.71 1.73 6.04 1.62 Metall W Pt Au Pb A(25 °C) W/Kcm 1.73 0.716 3.18 0.353 P(25 °C) us cm 5.65 10.81 2.40 20.99
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Transcribed Image Text:The Wiedemann-Franz law predicts a linear relationship between thermal (A) and electronic conductivity
2
A
77.²
KB
= LT. Hereby, L is the Lorenz number: L = (*)² =
= 2.44 · 10−8 WN/K². Calculate
3
of the Wiedemann-Franz law.
(o) for metals:
σ
the Lorenz number for the following metals and prove the validity
Metall
Metall
Al
Cu
Zn
Ag
X(25 °C)
W/K cm
2.37
4.01
1.16
4.29
p(25 °C)
un cm
2.71
1.73
6.04
1.62
W
Pt
Au
Pb
A(25 °C)
W/K cm
1.73
0.716
3.18
0.353
p(25 °C)
uΩ cm
5.65
10.81
2.40
20.99
(OR)
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