Electronic and magnetic properties of amorphous Fe--P--B alloys. [75 to 83 at. % Fe]
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.
- Research Organization:
- California Inst. of Tech., Pasadena (USA). W.M. Keck Lab. of Engineering Materials
- OSTI ID:
- 7213447
- Report Number(s):
- CALT-822-89
- Country of Publication:
- United States
- Language:
- English
Similar Records
Magnetic regimes in amorphous Ni--Fe--P--B alloys. [1. 7 to 300/sup 0/K]
Ferromagnetic and antiferromagnetic coupling in amorphous (Ni/sub 100-c/Mn/sub c/)/sub 78/P/sub 14/B/sub 8/. [C=0. 7 to 20 at. % 1. 7 to 270/sup 0/K]
Related Subjects
360104* -- Metals & Alloys-- Physical Properties
ALLOY SYSTEMS
ALLOYS
AMORPHOUS STATE
BORON COMPOUNDS
CHEMICAL COMPOSITION
COOLING
CURIE POINT
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON ALLOYS
IRON BASE ALLOYS
LOW TEMPERATURE
MAGNETIC MOMENTS
MAGNETIC PROPERTIES
MAGNETIZATION
MEDIUM TEMPERATURE
PHOSPHORUS COMPOUNDS
PHYSICAL PROPERTIES
SPLAT COOLING
TEMPERATURE DEPENDENCE
TERNARY ALLOY SYSTEMS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ULTRALOW TEMPERATURE
VERY LOW TEMPERATURE