Electrical and magnetic properties of binary amorphous transition metal alloys

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:6042361

Liou, S H

The electrical, superconductive, and magnetic properties of several binary transition metal amorphous and metastable crystalline alloys, Fe/sub x/Ti/sub 100-x/ (30 less than or equal to x less than or equal to 100), Fe/sub x/Zr/sub 100-x/ (20 less than or equal to x less than or equal to 93), Fe/sub x/Hf/sub 100-x/ (20 less than or equal to x less than or equal to 100), Fe/sub x/Nb/sub 100-x/ (22 less than or equal to x less than or equal to 85), Ni/sub x/Nb/sub 100-x/ (20 less than or equal to x less than or equal to 80), Cu/sub x/Nb/sub 100-x/ (10 less than or equal to x less than or equal to 90) were studied over a wide composition range. Films were made using a magnetron sputtering system, and the structure of the films was investigated by energy dispersive x-ray diffraction. The composition region of each amorphous alloys system was determined and found in good agreement with a model proposed by Egami and Waseda. The magnetic properties and hyperfine interactions in the films were investigated using a conventional Mossbauer spectrometer and a /sup 57/Co in Rh matrix source. In all Fe-early transition metal binary alloys systems, Fe does not retain its moment in the low iron concentration region and the result is that the critical concentration for magnetic order (x/sub c/) is much larger than anticipated from percolation considerations. A direct comparison between crystalline alloys and their amorphous counterparts of the same composition illustrate no clear correlation between crystalline and amorphous states. Pronounced discontinuities in the magnetic properties with variation in Fe content of all Fe-early transition metal alloys at phase boundaries separating amorphous and crystalline states were observed.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA)
• OSTI ID: 6042361
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BETA DECAY RADIOISOTOPES
COBALT 57
COBALT ISOTOPES
COPPER ALLOYS
DAYS LIVING RADIOISOTOPES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON CAPTURE RADIOISOTOPES
HAFNIUM ALLOYS
INTERMEDIATE MASS NUCLEI
IRON ALLOYS
ISOTOPES
MAGNETIC PROPERTIES
MOESSBAUER EFFECT
NICKEL ALLOYS
NIOBIUM ALLOYS
NUCLEI
ODD-EVEN NUCLEI
PHYSICAL PROPERTIES
RADIOISOTOPES
SUPERCONDUCTIVITY
TITANIUM ALLOYS
ZIRCONIUM ALLOYS