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

DOI: 10.1039/C9DT01120J DOI Help

Authors: Pavel E. Kazin (Lomonosov Moscow State University) , Mikhail A. Zykin (Lomonosov Moscow State University) , Oxana V. Magdysyuk (Diamond Light Source) , Valentina V. Utochnikova (Lomonosov Moscow State University) , Evgeny A. Gorbachev (Lomonosov Moscow State University) , Reinhard K. Kremer (Max Planck Institute for Solid State Research) , Walter Schnelle (Max Planck Institute for Chemical Physics of Solids) , Claudia Felser (Max Planck Institute for Chemical Physics of Solids) , Martin Jansen (Max Planck Institute for Solid State Research; Max Planck Institute for Chemical Physics of Solids)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Dalton Transactions , VOL 365

State: Published (Approved)
Published: March 2019
Diamond Proposal Number(s): 14465

Abstract: Tb for Ca substituted hydroxyapatite ceramic samples with composition Ca10−xTbx(PO4)6(OH1−x/2−δ)2, where x = 0.1, 0.5, were synthesized by solid-state reaction at 1300 °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 Å 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 MJ = ±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.

Subject Areas: Materials, Chemistry, Physics

Instruments: I12-JEEP: Joint Engineering, Environmental and Processing