Effect of annealing on the structure of an amorphous (Mo/sub 0. 6/Ru/sub 0. 4/)/sub 82/B/sub 18/ alloy alloy

Journal Article · Mon Jan 31 23:00:00 EST 1983 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.27.1586· OSTI ID:6316577

Koch, C C; Kroeger, D M; Lin, J S; Scarbrough, J O; Johnson, W L; Anderson, A C

The amorphous metallic glass (Mo/sub 0.6/Ru/sub 0.4/)/sub 82/B/sub 18/ was annealed for various lengths of time at temperatures up to 650 /sup 0/C. The changes in structure due to these annealing treatments were determined by measurements of superconducting properties (T/sub c/, B/sub c/2, J/sub c/), electrical resistivity (p/sub n/), low-temperature specific heat (electronic coefficient ..gamma..), small-angle x-ray scattering (SAXS), and transmission electron microscopy (TEM). At lower annealing temperatures (< or =450 /sup 0/C) only small changes occurred in the composition-dependent parameters (T/sub c/,..gamma..) but large degradations were exhibited in those quantities (J/sub c/, fracture strain) sensitive to the defect structure. No evidence of microstructural changes was revealed by SAXS or TEM in this regime. At higher annealing temperatures (or longer times) evidence for the development of, first, phase separation, then, the beginnings of crystallization was found by SAXS and TEM. In this regime larger degradations of T/sub c/ and ..gamma.. occurred along with a change in the form of the F/sub p/(b) curve (i.e., a change in the fluxoid pinning mechanism). The above observations imply annealing-induced long-range compositional variations. The activation energy for the onset of long-range compositional inhomogeneity was determined to be 309 kJmol/sup -1/ (3.2 eV).

• Research Organization: Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 6316577
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 27:3; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals &amp; Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
&amp; Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
AMORPHOUS STATE
ANNEALING
BORON ALLOYS
COHERENT SCATTERING
CRITICAL CURRENT
CRITICAL FIELD
CURRENTS
DATA
DIFFRACTION
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
ELECTRON MICROSCOPY
ELECTRONIC SPECIFIC HEAT
EXPERIMENTAL DATA
GLASS
HEAT TREATMENTS
INFORMATION
MAGNETIC FIELDS
MICROSCOPY
MOLYBDENUM ALLOYS
NUMERICAL DATA
PHYSICAL PROPERTIES
PLATINUM METAL ALLOYS
RUTHENIUM ALLOYS
SCATTERING
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
X-RAY DIFFRACTION