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http://dx.doi.org/10.25673/38227
Title: | On the incorporation of nickel into hexagonal barium titanate : magnetic properties and electron paramagnetic resonance (EPR) |
Author(s): | Böttcher, R. Langhammer, H. T. Walther, T. Kücker, S. Ebbinghaus, Stefan ![]() |
Issue Date: | 2021 |
Type: | Article |
Language: | German |
Abstract: | Systematic measurements of the magnetic moment of hexagonal 6H-BaTiO3 + 0.04 BaO + x NiO (0.005 ≤ x ≤ 0.02) ceramics were performed to study the influence of Ni ions on the magnetic properties. By temperature-dependent measurements of the paramagnetic susceptibility at 90 kOe, the Ni2+ ion was identified as the majority defect in air-sintered Ni-doped hexagonal barium titanate. Q-band EPR investigations of a 2.0 mol% Ni-doped single crystal revealed three different Ni centers located at Ti sites: first, Ni3+ ions at Ti sites in intact oxygen octahedra, second, Ni3+ associated with an oxygen vacancy and third, the presence of Ni2+ centers leading to a forbidden transition. The Ni3+—VO associate characterized by a vacancy in the face-sharing oxygen plane of the oxygen octahedra can be ruled out. The crystal field parameters of the Ni2+ defect were estimated by a combined fitting of the paramagnetic susceptibility and the EPR fine structure parameter D to B40 ≈ −17,300 cm−1, ∣∣B20∣∣ ≈ 2500 cm−1 and B43 ≈ 19,000 cm−1. |
URI: | https://opendata.uni-halle.de//handle/1981185920/38470 http://dx.doi.org/10.25673/38227 |
Open Access: | ![]() |
License: | ![]() |
Sponsor/Funder: | Publikationsfond MLU |
Journal Title: | Journal of materials science |
Publisher: | Springer Science + Business Media B.V |
Publisher Place: | Dordrecht [u.a.] |
Volume: | 56 |
Issue: | 8 |
Original Publication: | 10.1007/s10853-020-05566-7 |
Page Start: | 4967 |
Page End: | 4978 |
Appears in Collections: | Open Access Publikationen der MLU |
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Böttcher2021_Article_OnTheIncorporationOfNickelInto.pdf | 973.59 kB | Adobe PDF | ![]() View/Open |