Synthesis and stability of Nb/sub 3/Ge made by electron-beam codeposition

Journal Article · Wed Sep 01 04:00:00 EDT 1976 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.89060· OSTI ID:7343689

Hallak, A B; Hammond, R H; Geballe, T H

Niobium-germanium (Nb-Ge) films which remain superconducting up to about 22.5 degreeK have been prepared using high-rate (33--133 A/sec) electron-beam codeposition. The presence of oxygen in the deposition chamber is necessary for stabilizing the high-T/subc/ A15 phase. Analysis of Nb-Ge films shows that oxygen extends, with some temperature dependence, the Ge-rich range of the A15 phase with an accompanying decrease in the lattice constant. An amorphous component in the films is first detected below a deposition temperature of 800 degreeC. It increases rapidly at lower temperatures and becomes dominant at about 600 degreeC. The A15 phase diagram was determined for the first time for temperatures below 875 degreeC. (AIP)

• Research Organization: W. W. Hansen Laboratories of Physics, Stanford University, Stanford, California 94305
• OSTI ID: 7343689
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 29:5; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
BEAMS
CHEMICAL COATING
CHEMICAL PREPARATION
CHEMICAL VAPOR DEPOSITION
CRYOGENIC FLUIDS
DEPOSITION
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRON BEAMS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
FILMS
FLUIDS
GERMANIUM ALLOYS
LATTICE PARAMETERS
LEPTON BEAMS
METASTABLE STATES
NIOBIUM ALLOYS
NIOBIUM BASE ALLOYS
NONMETALS
OXYGEN
PARTICLE BEAMS
PHASE STUDIES
PHYSICAL PROPERTIES
STABILITY
STABILIZATION
SUPERCONDUCTIVITY
SURFACE COATING
SYNTHESIS
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE