MMT rare-earth magnets
MMT magnet types
Hysteresis characteristics
Magnetic parameters
Electric and calorimetric parameters
Mechanical parameters
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Table3.
Electric and calorimetric parameters
of the most common types of permanent magnets
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| Material |
SER,
Ohm*m |
Cp,
J/(kg_K) |
STC,
W/(m*K) |
TEC,106*Ê-1 |
| along
EMD |
across
EMD |
Barium
Ferrite |
>104 |
500-800 |
5-10 |
9.2-13.3 |
9.2-10 |
Strontium
Ferrite |
>104 |
500-800 |
6-10 |
9.2-15 |
9.2-15 |
| Iron-Chromium-Cobalt |
0.6*106 |
~400 |
- |
12.2 |
| Alnico |
(0.44-0.7)*106 |
~400 |
~25 |
11-14 |
| SmCo5 |
(0.5-0.6)*106 |
~370 |
~10 |
~7 |
~13 |
| Sm2Co17 |
(0.75-0.9)*106 |
340-390 |
~12 |
8-10 |
11-12 |
| Nd-Fe-B |
(1.2-1.6)*106 |
~440 |
~9 |
5 |
-1 |
SER,
Ohm*m - specific electrical
resistance,
Cp, Joules/(kg_K)
- specific heat capacity,
STC, Watt/(m*K) - specific thermoconductivity,
TEC,106*Ê-1
- thermal expansion coefficient
EMD - easy magnetisation direction.
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