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Bücher Englische Bücher Wissen & Bildung Naturwissenschaft, Medizin, Informatik, Technik Chemie Anorganische Chemie Magnetic Field-assisted Chemical Vapor Deposition of Iron, Vanadium and Titanium Oxides
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Magnetic Field-assisted Chemical Vapor Deposition of Iron, Vanadium and Titanium Oxides
Daniel Stadler (Broschiert, Englisch)
★★★★★
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Beschreibung
The aim of this thesis is to expand the experimental space needed to understand the effects associated with magnetic field application during MOCVD process, such as directed structure growth, stabilization of magnetic phases or reduced magnetocrystalline anisotropy. The decomposition of carbonyl and alkoxide precursors in magnetic fields up to 1000 mT led to increased photocatalytic performances… or a reduction of magnetic anisotropy, respectively. The outcome of XRD and X-PEEM experiments clearly demonstrated that the characteristic phase transition from ferrimagnetic magnetite to antiferromagnetic hematite is suppressed by the applied magnetic field. In addition, XMCD showed that the relative ratio between ferromagnetically coupled Fe(III) and Fe(II) was enlarged, if an external magnetic field was applied throughout the process.
It was also shown that the application of magnetic fields during CVD allowed additional control to alter the chemical composition of CVD deposits. A set of early transition metal alkoxides were tested in field-assisted and zero field CVD processes. Magnetic field-assisted processes were found to boost chromium carbide formation that decomposed to the trivalent oxide under zero field conditions, while solely oxide formation was found for vanadium and titanium containing precursors. Increasing the precursor sublimation temperature of chromium(IV) alkoxide under zero-field conditions also led to carbide formation, indicating that the presence of magnetic fields during CVD causes partial pressure variations of the precursor in the reactor that was also verified by online mass spectrometry.
In summary, the application of magnetic fields offer additional control over structure growth and transformation in field-assisted CVD. External fields provide additional possibilities for in-situ control over fabrication of functional materials that need to be considered as additional parameter to influence materials formation. Dieses Produkt haben wir gerade leider nicht auf Lager.
Handgeprüfte Gebrauchtware
Bis zu 50 % günstiger als neu
Der Umwelt zuliebe
Technische Daten
Erscheinungsdatum
26.04.2021
Sprache
Englisch
EAN
9783843947626
Herausgeber
Dr. Hut
Serien- oder Bandtitel
Anorganische Chemie
Sonderedition
Nein
Autor
Daniel Stadler
Seitenanzahl
185
Einbandart
Broschiert
Schlagwörter
Anorganische Chemie, CVD, Nanomaterialien
Thema-Inhalt
PNK - Anorganische Chemie
Höhe
210 mm
Breite
14.8 cm
-.-
★★★★★
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