日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 4 (1987),
pp. 285-291

Increase of Electrical Resistivity with Ordering of Fe-(50--80 at%)Pd Alloys

Takasi Takezawa1, Takashi Miwa2 and Toru Yokoyama3

1Faculty of Education, Yokohama National University, Yokohama
2Graduate Student, Yokohama National University, Yokohama. Present address: Device Development Center, Hitachi Ltd., Tokyo
3Faculty of Engineering, Yokohama National University, Yokohama

Abstract:

Electrical resistivity measurements, X-ray diffractometry and transmission electron microscopy of Fe-Pd alloys have been carried out. The electrical resistivity of 50--80 at%Pd alloys increases rapidly with ordering below the order-disorder transition temperature (Tc), while it is nearly constant in the disordered phase above Tc. Below Tc these alloys have the FePd superlattice (L10 type) in the range of 50--58 at%Pd and the FePd3 superlattice (L12 type) in the range of 63--77.5 at%Pd. All of the alloys below Tc are formed with long-range order. Fe-Pd ordered alloys are the first to show an increase in electrical resistivity associated with the formation of long-range order. It is suggested that the formation of superlattice of Fe-Pd system can be explained by the Brillouin Zone effect.


(Received 1986/10/14)

Keywords:

iron-palladium alloys, order-disorder transformation, ordered alloy, superlattice, electrical resistivity, phase stability


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