Composition

Sm2Co17

XG 32 30 28 26 24 22

SmCo5
XG 24 22 20 18

Physical characteristics

Curie temperature

℃

800 to 850

700 to 750

(K)

(1073 to 1123)

(973 to 1023)

Thermal expansion coefficient

C//

1℃

8×10-6

6×10-6

(1K)

(8×10-6)

(6×10-6)

C⊥

1℃

11×10-6

13×10-6

(1K)

(11×10-6 )

(13×10-6)

Thermal conductivity

Kcal/mhr℃

10

11

(W/mK)

(12)

(13)

Specific heat

Cal/g℃

8×10-2

9×10-2

(J/kgK)

(335)

(377)

Specific resistivity

Ω-cm

8.6×10-5

5.3×10-5

Mechanical characteristics

Deflection strength

Kg/mm2

15

18

(N/m2)

(1.5×108)

(1.8×108)

Compressive strength

Kg/mm2

82

102

(N/m2)

(8×108)

(10×108)

Tensile strength

Kg/mm2

3.6

4.1

(N/m2)

(3.5×107)

(4×107)

Young’s modulus

Kg/mm2

1.2×104

1.6×104

(N/m2)

(1.2×1011)

(1.6×1011)

Vickers hardness

Hv

500 to 600

450 to 500

Temperature

-100℃ to -20℃

20℃ to 100℃

100℃ to 200℃

Sm2Co17 XG32 30 28 26 24 22

-0.030%/℃

-0.030%/℃

-0.035%/℃

SmCo5 24 22 20 18

-0.045

-0.045

-0.050