ΜΕΛΕΤΗ ΔΟΜΙΚΩΝ ΚΑΙ ΜΑΓΝΗΤΙΚΩΝ ΙΔΙΟΤΗΤΩΝ ΣΕ ΥΛΙΚΑ ΜΟΝΙΜΩΝ ΜΑΓΝΗΤΩΝ: ΟΙ ΥΠΟΚΑΤΕΣΤΗΜΕΝΟΙ ΜΕ ΖΝ ΕΞΑΓΩΝΙΚΟΙ ΦΕΡΙΤΕΣ ΜΝ2-W

STUDY OF SYNTHESIS AND MIXED ALKALINE EARTH AND TRANSITION METALS OXIDES, NAMELY THE W-TYPE HEXAGONAL FERRITES CONTAINING ZN AND MN, WITH CHEMICAL FORMULAE SRZNXMN2-XFE16027 AND BAZNXMN2- XFE16O27O. THE STRUCTURAL AND MAGNETIC PROPERTIESOF THESE SERIES ARE STUDIED AND THEIR TECHNOLOGICAL INTEREST AS PERMANENT MAGNET MATERIALS IS EXAMINED. SINGLE PHASE POLYCRYSTALLINE SAMPLES HAVE BEEN PREPARED BY SOLID STATE REACTION OF OXIDES AND CATIONATES. THE PURITY CONTROL AND CRYSTALLOGRAPHIC CHARACTERIZATION HAVE BEEN PERFORMED BY MEANS OF X-RAY DIFFRACTION. THE CURIE TEMPERATURE HAS BEEN OBTAINED FROM SUSCEPTIBILITY MEASUREMENTS OF HIGH TEMPERATURES. HIGH FIELD (UP TO 180 KOE) MAGNETIZATION MEASUREMENTS HAVE BEEN PERFORMED IN THE TEMPERATURE RANGE 4.2- 300K. A THOROUGH ANALYSIS OF THE MAGNETIZATION CURVES ACCORDING TO THE LAW OF APPROACH TO SATURATION PROVIDED THE VALUES OF SATURATION MAGNETIZATION (MO), ANISOTROPY FIELD (HA) AND SUPERIMPOSEDSUSCEPTIBILITY (X). THE RESOLUTION OF THE CRYSTAL AND MAGNETIC STRUCTURES HAS BEEN ACHIEVED BY MEANS OF NEUTRON DIFFRACTION AT HIGH (500 C) AND LOW (4.2K) TEMPERATURES. THE NATURE AND VALENCY OF THE CATIONS IN EACH SUBLATTICE, THE EXACTCOMPOSITION AND CHEMICAL FORMULA AS WELL AS THE MAGNETIC STRUCTURE (I.E. THE VALUE AND DIRECTION OF THE MAGNETIC MOMENTS IN THE SEVEN SUBLATTICES) HAVE BEEN DETERMINED. FROM THE RESULTS, IT IS CONCLUDED THAT, REGARDING THE POSSIBILITY OF TECHNOLOGICAL APPLICATIONS, AN IMPROVEMENT OF THE MAGNETIC PROPERTIES IS OBTAINED BY PARTIAL SUBSTITUTION OF MN BY ZN.

Grantor dc:publisher

Aristotle University Of Thessaloniki (AUTH)

Year dc:date

1989

Authors dc:creator

• Λιτσαρδάκης, Γιώργος
• Litsardakis, Georgios

• ΕΞΑΓΩΝΙΚΟΙ ΦΕΡΡΙΤΕΣ
• ΘΕΩΡΙΑ ΑΝΑΠΑΡΑΣΤΑΣΕΩΝ
• Κρυσταλλική δομή
• ΜΑΓΝΗΤΙΚΕΣ ΜΕΤΡΗΣΕΙΣΣΕ ΥΨΗΛΑ ΠΕΔΙΑ
• Μαγνητική δομή
• Μόνιμοι μαγνήτες
• ΝΟΜΟΣ ΤΗΣ ΠΡΟΣΕΓΓΙΣΗΣ ΣΤΟΝ ΚΟΡΟ
• ΠΑΡΑΣΚΕΥΗ ΚΕΡΑΜΙΚΩΝ ΥΛΙΚΩΝ
• Πεδίο ανισοτροπίας
• Περίθλαση νετρονίων
• Anisotropy field
• Crystal structure
• HEXAGONAL FERRITES
• HIGH FIELD MAGNETIZATION MEASUREMENTS
• LAW OF APPROACH TO SATURATION
• Magnetic structure
• Neutron diffraction
• Permanent magnets
• REPRESENTATION THEORY
• SYNTHESIS OF CERAMIC POWDERS
• Επιστήμες Μηχανικού και Τεχνολογία
• Επιστήμη Ηλεκτρολόγου Μηχανικού, Ηλεκτρονικού Μηχανικού, Μηχανικού Η/Υ
• Engineering and Technology
• Electrical Engineering, Electronic Engineering, Information Engineering

Language dc:language

gre

Identifier

10.12681/eadd/1276

OAI identifier oai:identifier

oai:10442/1276