Magnetic And Electronic Properties Of Amorphous Fe Al P C Alloys
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Electronic and Magnetic Properties of Amorphous Fe--P--B Alloys. [75 to 83 At. % Fe].
| Author | : |
| Publisher | : |
| Total Pages | : |
| Release | : 1976 |
| Genre | : |
| ISBN | : |
The ternary diagram of the amorphous phase in the splat-cooled Fe--P--B system was investigated by x-ray diffraction measurements. Alloys were found to be amorphous within the Fe concentration range 75 less than or equal to c/sub Fe/ less than or equal to 83 at. percent. For a fixed Fe concentration, B substitutes for P over a large scale, the maximum substitution occurring for c/sub Fe/ = 80 at. percent. Concentration dependence of the electronic and magnetic properties was systematically studied in alloys within the whole amorphous diagram by means of bulk magnetization, anti .mu. (4.2/sup 0/K), Curie temperature, T/sub c/, and electrical resistivity, rho, measurements from 4.2/sup 0/K up to the amorphous-crystal transformation. The composition dependence of anti .mu. and T/sub c/ when B substitutes for P at c/sub Fe/ constant suggests the existence of two different short-range orders in the amorphous alloys, corresponding to the epsilon and epsilon/sub 1/ crystal structures in the Fe/sub 3/P/sub 1-x/B/sub x/ compounds. The concentration dependence of anti .mu. and T/sub c/ when P (or B) substitutes for Fe at c/sub B/ (or c/sub P/) constant is explained by a comparison between the amorphous Fe and the fcc Fe. A minimum in the variation of rho as a function of the temperature T occurs at T/sub m/. The temperature dependence of rho is expressed by a phenomenological law: rho(T) = rho/sub 0/ + A log T + B T/sup 2/ + CT. The concentration dependence of T/sub m/ and of the coefficients A and B is discussed in relation with the magnetic and structural properties of the amorphous Fe--P--B alloys. 10 figures, 1 table.
Amorphous Magnetism
| Author | : Takahito Kaneyoshi |
| Publisher | : CRC Press |
| Total Pages | : 198 |
| Release | : 2018-01-18 |
| Genre | : Science |
| ISBN | : 1351078062 |
This book presents some of the methods used in the theory of amorphous magnetism, from a single standpoint that amorphous magnets have a topologically disordered structure of the type given by the dense random packing of hard spheres.The primary aim is to show systematically the present theoretical apparatus in a form which would allow the reader to use it in investigations of still unsolved problems. Even within these limits, the theory of amorphous magnetism is now a very large subject. This book is not designed to review all the developments in this rapidly developing area. It is primarily intended for the novice in this field, rather than the specialist.
Structure and Properties of an Amorphous Ferromagnetic Alloy
| Author | : Stephen Chung-hsiung Lin |
| Publisher | : |
| Total Pages | : 160 |
| Release | : 1968 |
| Genre | : Electronic dissertations |
| ISBN | : |
The structure and the electrical and magnetic properties of an amorphous alloy containing approximately 80 at .% iron, 13 at.% phos phorus and 7 at.% carbon (Fe80Fe13C7) obtained by rapid quenching from the liquid state have been studied. Transmission electron diffraction data confirm the amorphous nature of this alloy. An analysis of the radial distribution function obtained from X-ray diffraction data indicates that the number of nearest neighbors is approximately seven, at a distance of 2.6A. The structure of the alloy can be related to that of silicate glasses and is based on a random arrangement of trigonal prisms of Fe2P and Fe3C types in which the iron atoms have an average ligancy of seven. Electrical resistance measurements show that the alloys are metallic. A minimum in the electrical resistivity vs. temperature curve is observed between 10° K to 50° K depending on the specimen, and the temperature at which the minimum occurs is related to the degree of local ordering. The Fe-P-C amorphous alloys are ferromagnetic. The Curie temperature measured by the induction method and by Mossbauer spectroscopy is 315° C. The field dependence of the magneto-resistance at temperatures from liquid helium to room temperature is similar to that found in crystalline iron. The ordinary Hall coefficient is approximately 10−11 volt-cm/amp-G. The spontaneous Hall coefficient is about 0.6 x 10−9 volt-cm/amp-G and is practically independent of temperature from liquid helium temperature up to 300° c.
Concentration Dependence of the Magnetic Properties in Amorphous Fe-P-B Alloys
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| Publisher | : |
| Total Pages | : |
| Release | : 1976 |
| Genre | : |
| ISBN | : |
The variation with composition of the magnetic properties of amorphous Fe--P--B alloys obtained by splat-cooling is discussed. For a given Fe concentration, the magnetic moment per atom anti .mu. and the Curie temperature T/sub c/ both increase with the substitution of B for P. The variation of anti .mu. and T/sub c/ as a function of the B content had the same discontinuity as that occurring between the two phases epsilon and psilon1 of the crystalline Fe3P/sub 1-x/B3 compounds. The variation of anti .mu. and T/sub c/ was also studied when one metalloid (P or B) substitutes for Fe, the other metalloid remaining constant. The value of anti .mu. was found to decrease when the P or B content is increased, as expected from a rigid band model. In the same concentration range, T/sub c/ increases with either P or B. The different behaviors of anti .mu. and T/sub c/ are tentatively explained by assuming that the amorphous Fe has two magnetic states (ferro and antiferromagnetic) as already suggested for crystalline Fe in a fcc environment.
