Influence of Composition on the Structure, Electric and Magnetic Properties of Pd-Mn-P and Pd-Co-P Amorphous Alloys

Influence of Composition on the Structure, Electric and Magnetic Properties of Pd-Mn-P and Pd-Co-P Amorphous Alloys
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.

Electric and Magnetic Properties of Pd--Mn--P Amorphous Alloys

Electric and Magnetic Properties of Pd--Mn--P Amorphous Alloys
Author:
Publisher:
Total Pages:
Release: 1973
Genre:
ISBN:

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).

Scientific and Technical Aerospace Reports

Scientific and Technical Aerospace Reports
Author:
Publisher:
Total Pages: 1028
Release: 1994
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.

The Electrical and Magnetic Properties of Amorphous Pd-Cu-P Alloys

The Electrical and Magnetic Properties of Amorphous Pd-Cu-P Alloys
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.

Magnetic and Electrical Properties of Amorphous Pd--Co--P Alloys

Magnetic and Electrical Properties of Amorphous Pd--Co--P Alloys
Author:
Publisher:
Total Pages:
Release: 1973
Genre:
ISBN:

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).

Bibliography

Bibliography
Author: Pierre Villars
Publisher: Walter de Gruyter
Total Pages: 1827
Release: 2012-12-21
Genre: Science
ISBN: 3110276658

By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.