Abstract
Magnetic and structural behaviour and phase relationships of materials of composition R3Ni7B2 (R = Nd-Lu) were investigated. Detailed X-ray analysis yields that two hexagonal structures are encountered. For the heavy rare earth (Gd-Lu) the compounds crystallize in the CeNi3 structure. The space group is P63/mmc and each unit cell contains two formula units. The R3Ni7B2 where R = Nd-Sm (including Yb3Ni7B2) crystallize in the CeCo4B structure. The space group is P6/mmm and each unit cell contains one formula unit. The detailed crystal structures are discussed. The magnetic measurements show that Yb3Ni7B2 and Lu3Ni7B2 are Pauli paramagnetic. Sm3Ni7B2 is ferromagnetically ordered with a huge intrinsic magnetic hardness. The magnetization at the coercive field at low temperatures is extremely time dependent. The R3Ni7B2 which crystallize in CeNi3 structure are antiferromagnetic at low temperatures. All Mossbauer and magnetization experimental results can be explained assuming an antiferromagnetic exchange interaction in both 2(c) and 4(f) crystallographic sites and a ferromagnetic interaction between these sites.
Original language | English |
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Pages (from-to) | 43-48 |
Number of pages | 6 |
Journal | Journal of Physics and Chemistry of Solids |
Volume | 44 |
Issue number | 1 |
DOIs | |
State | Published - 1983 |