Samples of Tb0.3Dy0.7Fe2−x where x=0.05–0.10 (TERFENOL-D) were characterized for electrical resistivity and thermal diffusivity between room temperature and the Curie temperature, which for this composition is 360 °C. Additionally, the thermal diffusivity of one of the samples was measured to 1000 °C. Measurements were performed on two different orientations of standard, production-grade, grain-oriented TERFENOL-D produced by a Bridgman growth technique at ETREMA Products, Inc. The orientations were parallel and normal to the 〈112〉 crystallographic direction. The electrical resistivity and thermal diffusivity both exhibited isotropic behavior over the temperature range studied. The electrical resistivity of all samples increased monotonically from 0.06 mΩ-cm at room temperature to 0.14 mΩ cm at 360 °C, consistent with behavior expected for normal metals. The thermal conductivity was found to decrease with temperature from 135 mW/cm °C at room temperature to 122 mW/cm °C at 360 °C. The thermal diffusivity was found to exhibit a sharp cusp in the vicinity of the Curie temperature, TC, increasing with temperature for T>TC. Application of the Wiedemann–Franz law indicates that over 86% of the heat is carried by electrons.

1.
L. J.
van der Pauw
,
Philips Res. Rep.
13
,
1
(
1958
).
2.
Z.
Ndlela
and
C.
Bates
,
Rev. Sci. Instrum.
60
,
3482
(
1989
).
3.
G. T. Meaden, Electrical Resistance of Metals (Plenum, New York, 1965), p. 143.
4.
Jean Francis Baumard, in Compendium of Thermophysical Property Measurements, Survey of Measurement Techniques, Vol. 1, edited by K. D. Maglic, A. Cezairliyan, and V. E. Peletsky (Plenum Press, New York and London, 1984).
5.
Metals Handbook: Titanium Alloys (ASM International, 1994).
6.
M.
Senthil Kumar
,
K. V.
Reddy
, and
K. V. S.
Rama Rao
,
J. Appl. Phys.
77
,
4589
(
1995
).
7.
J. D.
Verhoeven
,
J. E.
Ostenson
,
E. D.
Gibson
, and
O. D.
McMasters
,
J. Appl. Phys.
66
,
772
(
1989
).
8.
K. R.
Dhilsha
and
K. V. S.
Rama Rao
,
J. Appl. Phys.
73
,
1380
(
1993
).
9.
M.
Senthil Kumar
,
K. V.
Reddy
, and
K. V. S.
Rama Rao
,
J. Appl. Phys.
77
,
4589
(
1995
).
10.
M. P.
Kawatra
,
S.
Skalski
,
J. A.
Mydosh
, and
J. I.
Budnick
,
Phys. Rev. Lett.
23
,
83
(
1969
).
11.
M. P.
Kawatra
,
J. A.
Mydosh
, and
J. I.
Budnick
,
Phys. Rev. B
2
,
665
(
1970
).
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