skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Upper critical fields and superconducting transition temperatures of amorphous Zr-base transition-metal alloys

Abstract

A systematic study of H/sub c2/(T) and T/sub c/(x) on the transition-metal amorphous alloy series Zr/sub 1-xNi/sub x/, Zr/sub 1-x/CO/sub x/, (Zr/sub 1-x Ti/sub x)/sub 0.78/Ni/sub 0.22/, and (Zr/sub 1-x/Nb/sub x/)/sub 0.78/Ni/sub 0.22/ over relatively wide ranges of T and x has been performed. All samples were rapidly quenched from the melt using a melt-spinning device constructed in this laboratory. Our resistively determined H/sub c2/(T) results are consistent with the standard theory (well known to give a reasonable account of H/sub c2/(T) for highly disordered cystalline alloys) in sharp contrast to the anomalously enhanced H/sub c2/(T) curves observed in amorphous alloys by some other investigators. The present work together with recent work in other laboratories now suggests that the latter anomalies are due to alloy inhomogeneities. Our T/sub c/(x) results are consistent with the work of others for the Zr/sub 1-x/Ni/sub x/ and Zr/sub 1-x/Co/sub x/ systems and show that T/sub c/ decreases linearly with x for 21 less than or equal to x less than or equal to 40. For the iso- average valence -electron-to atom ratio) system (Zr/sub 1-x/Ti/sub x/)/sub 0.78Ni/sub 0.22/ (0 less than or equal to x less than or equal to 0.3), T/sub c/ decreasesmore » with increasing x, opposite to the behavior of the crystalline hcp Zr/sub 1-x/Ti/sub x/ system. For the (Zr/sub 1-x/Nb/sub x/)0.78 Ni/sub 0.22/ system, T/sub c/ first increases and then decreases with increasing , unlike any other metallic glass alloy system measured to date. The presently observed vagaries in T/sub c/(x) behavior suggest that concomitant measurement of the x dependence of other electronic parameters in the same systems might be particularly valuable in understanding the mechanisms controlling T/sub c/ magnitudes in amorphous alloys.« less

Authors:
Publication Date:
Research Org.:
Indiana Univ., Bloomington (USA)
OSTI Identifier:
7026259
Resource Type:
Thesis/Dissertation
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COBALT ALLOYS; CRITICAL FIELD; TRANSITION TEMPERATURE; NICKEL ALLOYS; NIOBIUM ALLOYS; TITANIUM ALLOYS; ZIRCONIUM BASE ALLOYS; AMORPHOUS STATE; EXPERIMENTAL DATA; MAGNETIC FIELDS; QUANTITY RATIO; TEMPERATURE DEPENDENCE; ALLOYS; DATA; INFORMATION; NUMERICAL DATA; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; ZIRCONIUM ALLOYS; 360104* - Metals & Alloys- Physical Properties; 656102 - Solid State Physics- Superconductivity- Acoustic, Electronic, Magnetic, Optical, & Thermal Phenomena- (-1987)

Citation Formats

Karkut, M G. Upper critical fields and superconducting transition temperatures of amorphous Zr-base transition-metal alloys. United States: N. p., 1982. Web.
Karkut, M G. Upper critical fields and superconducting transition temperatures of amorphous Zr-base transition-metal alloys. United States.
Karkut, M G. Fri . "Upper critical fields and superconducting transition temperatures of amorphous Zr-base transition-metal alloys". United States.
@article{osti_7026259,
title = {Upper critical fields and superconducting transition temperatures of amorphous Zr-base transition-metal alloys},
author = {Karkut, M G},
abstractNote = {A systematic study of H/sub c2/(T) and T/sub c/(x) on the transition-metal amorphous alloy series Zr/sub 1-xNi/sub x/, Zr/sub 1-x/CO/sub x/, (Zr/sub 1-x Ti/sub x)/sub 0.78/Ni/sub 0.22/, and (Zr/sub 1-x/Nb/sub x/)/sub 0.78/Ni/sub 0.22/ over relatively wide ranges of T and x has been performed. All samples were rapidly quenched from the melt using a melt-spinning device constructed in this laboratory. Our resistively determined H/sub c2/(T) results are consistent with the standard theory (well known to give a reasonable account of H/sub c2/(T) for highly disordered cystalline alloys) in sharp contrast to the anomalously enhanced H/sub c2/(T) curves observed in amorphous alloys by some other investigators. The present work together with recent work in other laboratories now suggests that the latter anomalies are due to alloy inhomogeneities. Our T/sub c/(x) results are consistent with the work of others for the Zr/sub 1-x/Ni/sub x/ and Zr/sub 1-x/Co/sub x/ systems and show that T/sub c/ decreases linearly with x for 21 less than or equal to x less than or equal to 40. For the iso- average valence -electron-to atom ratio) system (Zr/sub 1-x/Ti/sub x/)/sub 0.78Ni/sub 0.22/ (0 less than or equal to x less than or equal to 0.3), T/sub c/ decreases with increasing x, opposite to the behavior of the crystalline hcp Zr/sub 1-x/Ti/sub x/ system. For the (Zr/sub 1-x/Nb/sub x/)0.78 Ni/sub 0.22/ system, T/sub c/ first increases and then decreases with increasing , unlike any other metallic glass alloy system measured to date. The presently observed vagaries in T/sub c/(x) behavior suggest that concomitant measurement of the x dependence of other electronic parameters in the same systems might be particularly valuable in understanding the mechanisms controlling T/sub c/ magnitudes in amorphous alloys.},
doi = {},
url = {https://www.osti.gov/biblio/7026259}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1982},
month = {1}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: