Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 7 of 7 for “"spinel ferrites"”.
-
Comparative of Flammable and Toxic Gas Sensing behavior for Rare-Earth Elements Substituted Cobalt based Spinel Ferrites
… work, we present a variety of cobalt-based spinel ferrites doped with 4f electron rare-earth ions to be used as flammable gas sensors. These spinel ferrites were fabricated following a glycol hydrothermal chemical-process. Due to their electronic configuration and charge dynamics, they are …
-
ΚΑΤΑΛΥΤΙΚΕΣ ΙΔΙΟΤΗΤΕΣ ΧΗΜΙΚΩΝ ΟΞΕΙΔΙΩΝ ΤΟΥ ΣΙΔΗΡΟΥ ΚΑΘΑΡΩΝ ΚΑΙ ΜΙΚΤΩΝ ΣΤΗ ΜΕΤΑΤΡΟΠΗ ΤΟΥ ΜΟΝΟΞΕΙΔΙΟΥ ΤΟΥ ΑΝΘΡΑΚΑ ΤΟΥ ΥΔΡΑΕΡΙΟΥ
PURE MAGNETIDE AND MIXED SPINEL FERRITES CONTAINING IN VARIOUS CONCENTRATIONS CR, CO OR NI AS A PROMOTER WERE PREPARED BY COPRECIPITATION, CALCINATION AND, WHEN NEEDED, REDUCTION X-RAY DIFFRACTION AND MOSSBAUER SPECTROSCOPY CONFIRMED THEFORMATION OF SPINEL FERRITES. THE ACTIVITIES OF THE PREPARED …
-
Chemical Correlation of Magnetic Permeability and Microwave Absorption in Spinel Ferrite Nanoparticles
Spinel ferrites (MFe₂O₄, where M = Mn²⁺, Co²⁺, Zn²⁺, etc.) are magnetic nanomaterials with tunable properties that are valuable for wireless communication, memory storage, and electronics. Their complex permeabilities that are governed by composition, particle size, and spin-orbit interactions play …
-
Investigation of co1-2xnixmnxceyfe2-yo4 double-substitution spinel for highly efficient detection of flammable and hazardous liquefied petroleum gas: sensing performance
… consider. In this research, double substitution spinels with chemical formula Co1-2xNixMnxFe2-yCeyO4, where 0 ≤ x = y ≤ 0.3, were prepared via the glycol thermal technique. The final products following the appropriate substitution were CoFe2O4 (dried naturally), CoFe2O4 (dried with Infrared …
-
Investigation of Spinel Ferrite Thin Films for Spintronics Applications
Spinel ferrite thin films have garnered special attention due to their usefulness in recent technological advances. They hold a significant promise for various device applications, including microwave devices, memory chips, transformer cores, antenna rods, and millimeter-wave integrated circuitry. …
-
Comparative study of rare- earth based ferrites for flammable and volatile organic compound gas sensors
… diffraction results indicated that a pure cubic spinel phase was formed for samples having a low concentration of Ce, but the high Ce doping (x ≥ 0.2) of magnesium ferrite resulted in the formation of secondary phases. The crystallite size of the compounds ranged from 2.2 nm to 15.3 nm. The 57Fe …
-
ΜΕΛΕΤΗ ΤΗΣ ΕΠΙΔΡΑΣΗΣ ΤΗΣ ΠΑΡΑΣΚΕΥΑΣΤΙΚΗΣ ΔΙΑΔΙΚΑΣΙΑΣ ΣΤΙΣ ΦΥΣΙΚΟΧΗΜΙΚΕΣ ΙΔΙΟΤΗΤΕΣ ΣΠΙΝΕΛΛΙΚΩΝ ΦΕΡΡΙΤΩΝ ΝΙΚΕΛΙΟΥ. ΕΦΑΡΜΟΓΗ ΣΤΙΣ ΚΑΤΑΛΥΤ...
Σ'ΑΥΤΗ ΤΗΝ ΕΡΓΑΣΙΑ ΜΕΛΕΤΗΘΗΚΕ Η ΔΙΑΔΙΚΑΣΙΑ ΠΑΡΑΣΚΕΥΗΣ ΣΠΙΝΕΛΛΙΚΩΝ ΦΕΡΡΙΤΩΝ ΝΙΚΕΛΙΟΥ ΚΑΙ Η ΕΠΙΔΡΑΣΗ ΤΗΣ ΣΤΗ ΔΙΑΜΟΡΦΩΣΗ ΤΩΝ ΦΥΣΙΚΟΧΗΜΙΚΩΝ ΤΟΥΣ ΙΔΙΟΤΗΤΩΝ. ΓΙΑ ΤΗΝ ΠΑΡΑΣΚΕΥΗ ΤΩΝ ΦΕΡΡΙΤΩΝ ΕΠΙΛΕΧΘΗΚΕ Η ΤΕΧΝΙΚΗ ΤΗΣ ΣΥΓΚΑΤΑΒΥΘΙΣΗΣ ΚΑΙ Η ΕΝ ΣΥΝΕΧΕΙΑ ΥΠΟΒΟΛΗ ΤΩΝ ΠΑΡΑΓΟΜΕΝΩΝ ΕΝΥΔΡΩΝ ΟΞΕΙΔΙΩΝ ΣΕ ΠΥΡΩΣΗ. …