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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.

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Volltext §
DOI: 10.5445/IR/1000060522
Originalveröffentlichung
DOI: 10.1039/c6tc02731h
Scopus
Zitationen: 8
Web of Science
Zitationen: 9
Coverbild
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Karlsruhe Nano Micro Facility (KNMF)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator ISSN: 2050-7526, 2050-7534
urn:nbn:de:swb:90-605223
KITopen-ID: 1000060522
HGF-Programm 43.22.01 (POF III, LK 01)
Erschienen in Journal of materials chemistry / C
Band 4
Heft 38
Seiten 8889-8896
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Web of Science
Scopus
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