Measurements of phonon dispersion curves, specific heats, and superconductivity in 4d niobium alloys

Journal Article · Sat May 15 04:00:00 EDT 1982 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.25.6096· OSTI ID:5149927

Cappelletti, R L; Wakabayashi, N; Kamitakahara, W A; Traylor, J G; Bevolo, A J

Inelastic neutron scattering measurements of symmetry-direction phonon dispersion curves at room temperature in two Zr-Nb alloys and in a Zr-Nb-Mo alloy are presented along with their low-temperature specific heats and superconducting transition temperatures. The phenomenological charge-fluctuation model (CFM) is used to fit the curves and to generate the phonon density of states for each sample. Moments of this distribution along with T/sub c/ and N/sub bs/(0) are used to determine for comparison with Butler's rigid-muffin-tin calculations. Although numerical agreement is not expected and does not occur, nevertheless the general trend around Nb is reproduced. An analysis of the longitudinal-phonon contribution to lambda on basis of the CFM is presented. Finally the Zr-Nb-Mo alloy is found to behave in detail like a Nb-Mo alloy of the same electron per atom ratio both in its dispersion curves and in other properties indicating the importance of this parameter.

• Research Organization: Department of Physics, Ohio University, Athens, Ohio 45701
• OSTI ID: 5149927
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 25:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
656102 -- Solid State Physics-- Superconductivity-- Acoustic
Electronic
Magnetic
Optical
& Thermal Phenomena-- (-1987)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALLOYS
COHERENT SCATTERING
CRYSTALS
DATA
DIFFRACTION
DISPERSION RELATIONS
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
EXPERIMENTAL DATA
HIGH VACUUM
INELASTIC SCATTERING
INFORMATION
MEDIUM TEMPERATURE
MELTING
MOLYBDENUM ALLOYS
MONOCHROMATORS
MONOCRYSTALS
MUFFIN-TIN POTENTIAL
NEUTRON DIFFRACTION
NIOBIUM ALLOYS
NUMERICAL DATA
PHASE TRANSFORMATIONS
PHONONS
PHYSICAL PROPERTIES
POTENTIALS
QUASI PARTICLES
SCATTERING
SPECIFIC HEAT
SUPERCONDUCTIVITY
THERMODYNAMIC PROPERTIES
TRANSITION TEMPERATURE
ZIRCONIUM ALLOYS
ZONE MELTING