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

Reitz, Christian 1; Suchomski, Christian; Wang, Di ORCID iD icon 1,2; Hahn, Horst 1; Brezesinski, Torsten ORCID iD icon 1
1 Institut für Nanotechnologie (INT), Karlsruher Institut für Technologie (KIT)
2 Karlsruhe Nano Micro Facility (KNMF), Karlsruher Institut für Technologie (KIT)

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.

Volltext §
DOI: 10.5445/IR/1000060522
DOI: 10.1039/c6tc02731h
Zitationen: 17
Zitationen: 17
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2016
Sprache Englisch
Identifikator ISSN: 2050-7526, 2050-7534
KITopen-ID: 1000060522
HGF-Programm 43.22.01 (POF III, LK 01) Functionality by Design
Erschienen in Journal of materials chemistry / C
Verlag Royal Society of Chemistry (RSC)
Band 4
Heft 38
Seiten 8889-8896
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Dimensions
Web of Science
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