TbO+ in a calcium apatite matrix featuring a triple trigger-type relaxation of 
magnetization

Kazin, Pavel E.; Zykin, Mikhail A.; Magdysyuk, Oxana V.; Utochnikova, Valentina V.; Gorbachev, Evgeny A.; Kremer, Reinhard K.; Schnelle, Walter; Felser, Claudia; Jansen, Martin

doi:10.1039/c9dt01120j

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TbO⁺ in a calcium apatite matrix featuring a triple trigger-type relaxation of magnetization

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Schnelle, Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Felser, Claudia
Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Jansen, Martin
Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Kazin, P. E., Zykin, M. A., Magdysyuk, O. V., Utochnikova, V. V., Gorbachev, E. A., Kremer, R. K., et al. (2019). TbO⁺ in a calcium apatite matrix featuring a triple trigger-type relaxation of magnetization. Dalton Transactions, 48(16), 5299-5307. doi:10.1039/c9dt01120j.

Cite as: https://hdl.handle.net/21.11116/0000-0003-91D8-5

Abstract

Tb for Ca substituted hydroxyapatite ceramic samples with composition Ca10-xTbx(PO4)(6)(OH1-x/2-)(2), where x = 0.1, 0.5, were synthesized by solid-state reaction at 1300 degrees C in air, and their crystal structure, vibrational spectra, luminescence, and magnetic properties were studied. Implanting Tb3+ into the calcium apatite crystal lattice results in formation of an effective TbO+ ion which displays a short terbium-oxygen bond of 2.15 angstrom and a stretching vibration at 534 cm(-1). The Tb3+ electronic structure has been revealed by analyzing the luminescence spectra and dc/ac magnetization data. Accordingly, the ground state represents a pseudo doublet with M-J = +/- 6 and the first exited level is by 112 cm(-1) higher in energy. The ion exhibits field induced magnetic bistability with the magnetization reversing over the first exited state. Three paths of magnetization relaxation with field-temperature controlled switching between the paths have been identified.