Phase analysis and magnetic properties of RTiFe sub 11 minus x Co sub x (R=Y,Gd) ( x =0--11)

Journal Article · Mon Apr 15 00:00:00 EDT 1991 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.347963· OSTI ID:5492861

Cheng, S F; Sinha, V K; Ma, B M; Sankar, S G; Wallace, W E ^[1]

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1. Metallurgical Engineering and Materials Science Department, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (USA)

Both as-cast and 1000 {degree}C annealed RTiFe{sub 11} samples are nearly single phase with a small amount of Fe{sub 2}Ti. Small amounts of Co additions do not change the microstructure, but the minor phase changed to a Fe,Co,Ti solid solution. At high Co concentration, as-cast samples are multiphase (1-12, 2-17, (Fe,Co,Ti)) and high-temperature ({similar to}1200 {degree}C) annealing is needed in order to produce a single-phase microstructure. Results of x-ray analysis and magnetic measurements show that YTiFe{sub 11}, YTiCo{sub 11}, GdTiFe{sub 11}, and GdTiCo{sub 11} are uniaxial and their anisotropy fields at room temperature are 22, 18, 33, and 25 kOe, respectively. Therefore, Fe and Co sublattices are uniaxial with Fe sublattice anisotropy stronger than that of Co. In the intermediate range of composition, there is a conical-planar region for both Y and Gd systems and spin reorientations with temperature were observed. In general, the anisotropy behavior of the RTiFe{sub 11{minus}{ital x}}Co{sub {ital x}} systems (R=Y,Gd) is similar but opposite to their counterpart of R{sub 2}Fe{sub 17{minus}{ital x}}Co{sub {ital x}}. This is due to the similarity of their crystal structure, as both are derivatives of 1-5. However, the strong contribution from the {ital K}{sub 2} anisotropy constant makes the anisotropy phase diagrams of 1-12 more complicated than those of 2-17.

• OSTI ID: 5492861
• Journal Information: Journal of Applied Physics; (USA), Vol. 69:8; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COBALT ALLOYS
MAGNETIC PROPERTIES
GADOLINIUM ALLOYS
IRON ALLOYS
TITANIUM ALLOYS
YTTRIUM ALLOYS
MICROSTRUCTURE
PHASE DIAGRAMS
QUATERNARY ALLOY SYSTEMS
X-RAY DIFFRACTION
ALLOY SYSTEMS
ALLOYS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DIAGRAMS
DIFFRACTION
PHYSICAL PROPERTIES
RARE EARTH ALLOYS
SCATTERING
360104* - Metals & Alloys- Physical Properties
360102 - Metals & Alloys- Structure & Phase Studies