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The electrical and magnetic properties of amorphous Pd-Cu-P alloys

Citation

Tangonan, Gregory Ligot (1976) The electrical and magnetic properties of amorphous Pd-Cu-P alloys. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechTHESIS:07182014-155504331

Abstract

The amorphous phases of the Pd-Cu-P system has been obtained using the technique of rapidly quenching from the liquid state. Broad maxima in the diffraction pattern were obtained in the X-ray diffraction studies which are indicative of a glass-like structure. The composition range over which the amorphous solid phase is retained for the Pd-Cu-P system is (Pd100-xCux)80P20 with 10 ≤ x ≤ 50 and (Pd65Cu35)100-yPy with 15 ≤ y ≤ 24 and (Pd60Cu40)100-yPy with 15 ≤ y ≤ 24.

The electrical resistivity for the Pd-Cu-P alloys decreases with temperature as T2 at low temperatures and as T at high temperatures up to the crystallization temperature. The structural scattering model of the resistivity proposed by Sinha and the spin-fluctuation resistivity model proposed by Hasegawa are re-examined in the light of the similarity of this result to the Pt-Ni-P and Pd-Ni-P systems. Objections are raised to these interpretations of the resistivity results and an alternate model is proposed consistent with the new results on Pd-Cu-P and the observation of similar effects in crystalline transition metal alloys. The observed negative temperature coefficients of resistivity in these amorphous alloys are thus interpreted as being due to the modification of the density of states with temperature through the electron-phonon interaction. The weak Pauli paramagnetism of the Pd-Cu-P, Pt-Ni-P and Pd-Ni-P alloys is interpreted as being modifications of the transition d-states as a result of the formation of strong transition metal-metalloid bonds rather than a large transfer of electrons from the glass former atoms (P in this case) to the d-band of the transition metal in a rigid band picture.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:Applied Physics
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Applied Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Duwez, Pol E.
Thesis Committee:
  • Unknown, Unknown
Defense Date:12 December 1975
Record Number:CaltechTHESIS:07182014-155504331
Persistent URL:http://resolver.caltech.edu/CaltechTHESIS:07182014-155504331
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:8570
Collection:CaltechTHESIS
Deposited By: Benjamin Perez
Deposited On:21 Jul 2014 14:53
Last Modified:21 Jul 2014 14:53

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