Issue 16, 2019

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

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.

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

Supplementary files

Article information

Article type
Paper
Submitted
14 Mar 2019
Accepted
23 Mar 2019
First published
26 Mar 2019

Dalton Trans., 2019,48, 5299-5307

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

P. E. Kazin, M. A. Zykin, O. V. Magdysyuk, V. V. Utochnikova, E. A. Gorbachev, R. K. Kremer, W. Schnelle, C. Felser and M. Jansen, Dalton Trans., 2019, 48, 5299 DOI: 10.1039/C9DT01120J

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