| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1815129 | Physica B: Condensed Matter | 2007 | 5 Pages |
An attempt is made to synthesize Nd2Co14C compound by mechanical alloying Nd16Co76B8−xCx (0⩽x⩽8) alloys and subsequent annealing. Phase formation and magnetic properties of Nd2Fe14B-type Nd16Co76B8−xCx alloys and their hydrides are investigated. The Nd2Co14(B,C) phase with Nd2Fe14B-type structure is formed for Nd16Co76B8−xCx (0⩽x⩽7) alloys, while NdCo7Cδ phase with TbCu7-type structure is observed in Nd16Co76C8 alloy. The lattice parameter c of the Nd2Co14(B,C) phase decreases with increasing the carbon content. A limit volume of the unit cell to form the Nd2Fe14B-type structure is estimated to be 0.870 nm3. The spin-reorientation temperature TSR increases with increasing the carbon content, due to an enhancement of magnetocrystalline anisotropy caused by carbon substitution for boron. After hydrogenation, the lattice expansion is observed for Nd16Co76B8−xCx (0⩽x⩽7) alloys. The spin-reorientation temperature of Nd16Co76B8−xCxHy (0⩽x⩽7) is much lower than that of the host alloys. Some structural and magnetic properties of hypothetic Nd2Co14C and Nd2Co14CHy compounds are estimated by extrapolation.
