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All sources NASA NTRS DOE OSTI

DOE OSTI2020

Materials Data on Co3B by Materials Project

Co3B is Cementite structured and crystallizes in the orthorhombic Pnma space group. The structure is three-dimensional. there are two inequivalent Co1+ sites. In the first Co1+ site, Co1+ is bonded in a 3-coordinate geometry to three equivalent B3- atoms. There are two shorter (2.05 Å) and one longer (2.27 Å) Co–B bond lengths. In the second Co1+ site, Co1+ is bonded in a distorted bent 150 degrees geometry to two equivalent B3- atoms. There are one shorter (2.02 Å) and one longer (2.03 Å) Co–B bond lengths. B3- is bonded in a 6-coordinate geometry to eight Co1+ atoms.

36 MATERIALS SCIENCE↗

NASA NTRS1991

Microstructural and magnetic characterization of rapidly solidified and annealed Pt-Co-B alloys

Significant increases in intrinsic coercivity (Hic) of Pt-Co alloys have been obtained by the addition of boron and the application of rapid solidification processing. After rapid solidification by double anvil splat quenching with subsequent annealing at 650 C for 30 min, an alloy of Pt42Co45B13 exhibits an Hic as high as 14 kOe. Annealing of the Pt-Co-B influences the L1(0) superlattice structure and grain size of the matrix, the crystal structure and size of Co-boride precipitate, and the distribution of magnetic domain walls. A microstructural analysis shows that the maximum H(ic) occurs when Co borides, having the Co3B structure, are within the single magnetic domain size. The magnetic hardening mechanism in Pt-Co-B is believed to be a combination of inhibited magnetic domain nucleation and difficult reverse magnetic domain growth caused by the interaction of the magnetically anisotropic Co borides with the L1(0) Pt-Co matrix.

Qiu, N.↗