The Electrical And Magnetic Properties Of Amorphous Pd Cu P Alloys
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Author | : Gregory Ligot Tangonan |
Publisher | : |
Total Pages | : 186 |
Release | : 1976 |
Genre | : Amorphous substances |
ISBN | : |
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[subscript x]Cu[subscript x])0P20 with 10 d"x d"50 and (Pd65Cu35)100−[subscript y]P[subscript y] with 15 d"y d"24 and (Pd60Cu40)100−[subscript y]P[subscript y] with 15 d"y d"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.
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Release | : 1973 |
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The magnetic properties of Pd- Co- P alloys show that they are ferromagnetic with a Curie temperature between 272 and 399 deg K as the cobalt concentration increases from 15 to 50 at.%. Below 20 at.% Co the short-range exchange interactions which produce the ferromagnetism are unable to establish a long-range magnetic order and a peak in the magnetization shows up at the lowest temperature range undei an applied field of 6.0 KOe. The electric resistivity measurements were performed from liquid helium temperature up to the vicinity of the melting point (900 deg K). The electrical resistivity of Pd-Co- P shows the coexistence of a Kondo-like minimum with ferromagnetism. The minimum becomes less important as the transition metal concentration increases and the coefficients of In T and T/sup 2/ become smaller and strongly temperature dependent. The spin ordering in these kinds of alloys can be simulated as the ordering due to an applied external field or as an increase in internal fields, due to an increase in transition metal concentration. The negative magnetoresistivity is a strong indication of the existence of localized moment. (auth).
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Release | : 1973 |
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The electric and magnetic properties of amorphous Pd-Mn-P alloys were studied in the range of 15 to 38 at.% manganese at a constant phosphorus concentration of 23 at.% and keeping the metallic contents at (Pd/sbu 70/Mn/sub 30/)/sub 100-y/P/sub y/ the concentration of phosphorus could vary from 17 to 26 at.%. The effect of the 3d band filling of the first transition metal group, the phosphorus concentration effect that acts as an electron donor, and the transition metal concentration effect were studied. (MCW).
Author | : Neville Ingersoll Marzwell |
Publisher | : |
Total Pages | : 394 |
Release | : 1973 |
Genre | : Electronic dissertations |
ISBN | : |
The influence of composition on the structure and on the electric and magnetic properties of amorphous Pd-Mn-P and Pd-Co-P prepared by rapid quenching techniques were investigated in terms of (1) the 3d band filling of the first transition metal group, (2) the phosphorus concentration effect which acts as an electron donor and (3) the transition metal concentration.
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Release | : 1971 |
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Author | : Dawning Pan |
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Total Pages | : |
Release | : 1974 |
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Total Pages | : 612 |
Release | : 1976 |
Genre | : Nuclear energy |
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Release | : 1975 |
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Total Pages | : 724 |
Release | : 1983 |
Genre | : Aeronautics |
ISBN | : |
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author | : R.W. Cochrane |
Publisher | : Elsevier |
Total Pages | : 590 |
Release | : 1988-01-01 |
Genre | : Technology & Engineering |
ISBN | : 0080984827 |
Rapidly Quenched Metals 6: Volume 3