STRUCTURAL AND MAGNETIC CHARACTERISTICS OF TiFe$sub 2$-ZrFe$sub 2$ AND ZrCo$sub 2$-ZrFe$sub 2$ ALLOYS

Journal Article · Mon Jul 01 04:00:00 EDT 1963 · Journal of Chemical Physics (U.S.)

DOI:https://doi.org/10.1063/1.1733990· OSTI ID:4651180

Piegger, E; Craig, R S

Structures and unit-cell dimensions for a number of alloys of TiFe/sub 2/ - ZrFe/sub 2/ and of ZrCo/sub 2/- ZrFe/sub 2/ were determined at room temperature, and the magnetic properties of alloys of the two systems were investigated over a range of temperature extending from 4 to 850 deg K. Results for the by a two-phase region extending from 56 to 85 mole% ZrFe/sub 2/. TiFe/ sub 2/ behaves like a strongly paramagnetic substance with a susceptibility that is practically temperature independent, whereas ZrFe/sub 2/ is ferromagnetic with a Curie temperature of 355 deg C. The effective moment per iron atom, obtained from the observed saturation magnetization at 4 deg K, is 1.62 mu /sub B/. The reduced moment in both the TiFe/sub 2/ and ZrFe/sub 2/ phases compared to that for elemental iron is attributed to a transfer of charge from Ti or Zr to iron. The ZrCo/sub 2/- ZrFe/sub 2/ alloys form a single phase system that approximately obeys Vegard's law. ZrCo/sub 2/ is found to be fairly strongly paramagnetic at room temperature, while at low temperature it appears to be either very weakly ferromagnetic or paramagnetic with a susceptibility that is field dependent and shows saturation effects. As ZrCo/sub 2/ is dissolved in ZrFe/sub 2/, the shapes of the magnetizationtemperature curves change in a way that indicates that the destruction of the ferromagnetism occurs over an unusually large temperature interval. The effect is attributed to microscopic variations in the molecular field in the solid solutions. The small values of the observed magnetic moments suggest that in these materials zirconium donates electrons to iron and cobalt. When Fe in ZrFe/sub 2/ is progressively replaced by Co, the average moment of Co and Fe is observed to decrease initially and to reach a minimum at about 40 mole% ZrFB/sub 2/. (auth)

• Research Organization: Univ. of Pittsburgh
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-036312
• OSTI ID: 4651180
• Journal Information: Journal of Chemical Physics (U.S.), Journal Name: Journal of Chemical Physics (U.S.) Vol. Vol: 39; ISSN JCPSA
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

ATOMS
COBALT ALLOYS
DIAGRAMS
ELECTRONS
FERROMAGNETIC MATERIALS
INTERMETALLIC COMPOUNDS
IRON ALLOYS
LATTICES
LOW TEMPERATURE
MAGNETIC MOMENTS
MAGNETISM
METALS, CERAMICS, AND OTHER MATERIALS
MOLECULES
PHASE DIAGRAMS
QUANTITATIVE ANALYSIS
SOLID SOLUTIONS
TEMPERATURE
TITANIUM ALLOYS
VARIATIONS
VEGARD LAW
ZIRCONIUM ALLOYS