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In situ tuning of magnetization via topotactic lithium insertion in ordered mesoporous lithium ferrite thin films

Reitz, Christian; Suchomski, Christian; Wang, Di; Hahn, Horst; Brezesinski, Torsten

Abstract (englisch): The synthesis and characterization of cubic mesostructured lithium ferrite (α-LiFe5O8) with 20 nm diameter pores and nanocrystalline walls is reported. The material is prepared in the form of thin films by sol–gel dip-coating using a poly(isobutylene)-block-poly(ethylene oxide) amphiphilic diblock copolymer as the porogen. Electron microscopy, X-ray scattering and diffraction, time-of-flight secondary ion mass spectrometry, Raman and X-ray photoelectron spectroscopy all show that α-LiFe5O8 can be templated to produce high-quality films that are chemically and phase-pure and thermally stable to over 600 °C. Magnetometry measurements indicate ferrimagnetic behavior below 300 K, with the coercivity exhibiting a T1/2 dependence. This novel mesoporous spinel material – when used as an electrode in secondary battery cells – can reversibly store charge via topotactic Li insertion, which allows for the intriguing possibility of tuning the magnetization at room temperature in a facile and controlled manner. The general approach is simple and should be applicable to a variety of other magnetic materials that are capable of reacting electrochemically with Li to produce reduced phases.

Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1039/c6tc02731h
ISSN: 2050-7526, 2050-7534
URN: urn:nbn:de:swb:90-605223
KITopen ID: 1000060522
HGF-Programm 43.22.01; LK 01
Erschienen in Journal of materials chemistry / C
Band 4
Heft 38
Seiten 8889-8896
Bemerkung zur Veröffentlichung Lizenz: Dieses Werk ist lizenziert unter CC BY 3.0 DE
RSC geförderter Open Access-Artikel
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