Magnetic structure of BaCaFe4O8-analysis of neutron diffraction measurements |
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Authors: | Y Abbas F Mostafa M Fayek |
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Institution: | Reactor and Neutron Physics Department, Atomic Energy Establishment, Atomic Energy Post, Cairo, Egypt |
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Abstract: | The compound BaCaFe4O8 crystallizes in the trigonal space group Pm with one formula unit per unit cell with lattice constants and Neutron diffraction measurements carried out on a powder sample over the temperature range 300–900 K showed that the compound undergoes a magnetic transition to an antiferromagnetic state at a Néel temperature TN = 680 ± 5 K. Analysis of the room temperature neutron diffraction pattern gave a magnetic unit cell that has the same periodicty as the crystallographic one. An antiferromagnetic model is proposed with the iron spin magnetic moments parallel to the c-axis of the unit cell. The magnetic moment of the Fe3+ ion was found to be (4.5 ± 0.1)μB |
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