Low temperature physical properties of superconductive zirconium-based and magnetic cobalt-manganese-boron amorphous alloys

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

OSTI ID:7008857

Wang, L Q

The author studies two amorphous metallic alloy groups (1) Zr-based superconducting alloys that included Fe/sub 100-x/Zr/sub x/ with x = 80, 75, 70, 65, 60, 35, and 10, and Ni/sub 100-x/Zr/sub x/ with x = 75, 65, 66, and 35. He measured the low temperature specific heat C/sub p/ (from 0.7 to 40 K) for all samples, the relative electrical resistivity rho/rho/sub 4.2/ or rho/rho/sub 300/ (from 1.5 K to 300K) for Fe/sub 90/Zr/sub 10/ and for the Ni-Zr alloy series, and the low-field a.c. magnetic susceptibility chi for the Fe-Zr alloys series; (2) magnetic (Co/sub 100-x/Mn/sub x/)/sub 100-y/B/sub y/ alloys with y = 11, 12, 16, 20, 24, 28 and 33, x = 9lt. slash0, 10, 20, 30, 40 and 50. These are all stable amorphous alloys of Co-Mn-B. He also measured the low-field a.c. magnetic susceptibility chi (from 1.8 K to 300K), the low temperature specific heat C/sub p/ (from 0.8 K to 40 K), and the relative electrical resistivity rho/rho/sub 300/ (from 1.5 K to 300 K). It was found, for the first time, that the critical concentration for the onset of superconductivity in the Fe/sub 100-x/Zr/sub x/ amorphous (melt-spun) alloys is x greater than or equal to 68 +/- 2, and in the Ni/sub 100-x/Zr/sub x/ amorphous alloys it is x greater than or equal to 37 +/- 2. Comparison of low temperature specific heat measurements for Fe-Zr and Ni-Zr with available results for Cu-Zr alloys shows that the composition trends of N/sub 0/(E/sub F/) are consistent with recent theoretical models and photoemission results.

• Research Organization: Delaware Univ., Newark (USA)
• OSTI ID: 7008857
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
ALLOYS
BORON ALLOYS
CHEMICAL COMPOSITION
COBALT ALLOYS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
IRON ALLOYS
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
NICKEL ALLOYS
PHYSICAL PROPERTIES
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
ZIRCONIUM ALLOYS