Magnetic properties of the LiMPO 4 (M = Co, Ni) compounds

• Published in: Journal of magnetism and magnetic materials Vol. 164; no. 1; pp. 251 - 255
• Main Authors: Goñi, A., Lezama, L., Barberis, G.E., Pizarro, J.L., Arriortua, M.I., Rojo, T.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 1996
• Subjects: EPR; LiCoPO 4; LiNiPO 4; Magnetic properties; Solid state synthesis; LiCoPO 4; Solid state synthesis; LiNiPO 4; EPR; Magnetic properties
• ISSN: 0304-8853
• DOI: 10.1016/S0304-8853(96)00394-0

Powder samples of LiNiPO 4, LiCoPO 4 together with LiMgPO 4 doped with 0.1% of Co 2+ were prepared by solid state reactions. Magnetic susceptibility measurements of the LiNiPO 4 and LiCoPO 4 compounds are consistent with 3D antiferromagnetic behaviour. The magnetic exchange value for the LiNiPO 4 phase is −5.61 K, with a g-value of 2.15. The EPR study of LiMgPO 4 doped with 0.1% of Co 2+ shows the large magnetic anisotropy of the Co 2+ ion in a distorted octahedral geometry. The obtained values at 4.2 K for the spin Hamiltonian parameters are g 1 = 6.16, g 2 = 4.14, g 3 = 2.53 and A 1 = 246 × 10 −4, A 2 = 89 × 10 −4and A 3 < 20 × 10 −4cm −1.