Cel TO DEVELOP EVALUATE KOREL HIGH-COERCIVITY MELT-SPUN RARE-EARTH-IRON ALLOYS AS PERMANENT MAGNET MATERIALS CONTAINING NO COBALT. THE FIRST PHASE WILL CONSIST OF PREPARING BINARY R1-XFEX ALLOYS WITH R = PR, ND, SM, AS A FUNCTION OF X AND SUBSTRATE VELOCITY TO ESTABLISH THE SYSTEMATIC BEHAVIOUR OF THEIR REMANENCE AND COERCIVITY. MAGNETIC STRUCTURES OF THE ALLOYS WILL BE INFERRED FROM MOESSBAUER SPECTRA IN AN APPLIED FIELD, AND FROM HIGH-FIELD MAGNETIZATION DATA. IF NECESSARY, THE LATTER MEASUREMENTS IN VERY HIGH FIELDS WILL BE PERFORMED. X-RAY DIFFRACTION, SCANNING ELECTRON MICROSCOPY AND DIFFERENTIAL SCANNING CALORIMETRY WILL BE USED TO CHARACTERIZE THE MICROSTRUCTURE OF MATERIALS PREPARED UNDER DIFFERENT CONDITIONS, AND TO DETERMINE THEIR THERMAL STABILITY. THE LONG-TERM STABILITY OF THE RELEVANT MAGNETIC PROPERTIES AT AMBIANT TEMPERATURE WILL ALSO BE OBSERVED OVER PERIODS OF 1-2 YEARS, AND KINETIC STUDIES WILL BE UNDERTAKEN. DURING THE NEXT PHASE, DETAILED INVESTIGATIONS OF THE MAGNETIC PROPERTIES AS A FUNCTION OF TEMPERATURE WILL FOLLOW, IN THE RANGE 4.2K-T TO EXTABLISH A MODEL FOR THE COERCIVITY AND REMANENCE. PARALLEL STUDIES OF METHODS TO INCREASE TC, FOR IRON-BASED AMORPHOUS ALLOYS, WILL FOCUS ON THE CHANGES IN THE MAGNETIC PROPERTIES ON HYDROGENATING MELT-SPUN T1-XFEX, WHERE T= Y, ZR... X-RAY STRUCTURAL STUDIES OF THE PRODUCTS WILL BE CARRIED OUT. SURFACE CONTAMINATION TECHNIQUES WILL BE USED TO PRESERVE THE HIDRIED, AND THEIR EFFECTIVENESS IN TIME AND AT ELEVATED TEMPERATURES WILL BE EXAMINED. IN THE LIGHT OF THESE RESULTS, CHEMICAL SUBSTITUENTS OTHER THAN HYDROGEN MAY BE DEVISED TO ENHANCE TC, AND ALSO TO FACILITATE FABRICATION IN BROAD RIBBONS. A LATER PHASE OF THE RESEARCH WILL EXPLORE THE POSSIBILITY OF APPLYING A TANGENTIAL FIELD TO THE QUENCH AREA, TO IMPROVE THE REMANENCE AND (BH) MAX. FIELD ANNEALING WILL ALSO BE INVESTIGATED. FINALLY, FUNDAMENTAL STUDIES OF THE NATURE OF THE RANDOM MAGNETIC ANISTROPY FOR RARE-EARTH IONS IN AMORPHOUS MATRICES WILL BE CARRIED OUT, BASED ON AY,75AL25 WHICH HAS ALREADY BEEN SUCCESSFULLY MELT-SPUN. CLOSE COLLABORATION IN VARIOUS PARTS OF THIS PROJECT WILL TAKE PLACE WITH THE LABORATOIRE LOUIS NEAL (SNCI) AND INSTITUT LAUE LANGEVIN (ILL), BOTH AT GRENOBLE, (FRANCE) AND WITH KENFORSCHUNGZENTRUM (KFK), KARLSRUHE (FRG).L Program(-y) PRE-RAWMAT 2C - Research and development programme (EEC) in the raw materials sector, 1982-1985 Temat(-y) Data not available Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator UNIVERSITY OF DUBLIN Wkład UE Brak danych Adres TRINITY COLLEGE DEPT.OF PURE AND APPLIED PHYSICS DUBLIN 2 Irlandia Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (3) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko Centre National de la Recherche Scientifique (CNRS) Francja Wkład UE Brak danych Adres 25 avenue des Martyrs 38042 Grenoble Zobacz na mapie Koszt całkowity Brak danych Forschungszentrum Karlsruhe Technik und Umwelt GmbH Niemcy Wkład UE Brak danych Adres 76021 Karlsruhe Zobacz na mapie Koszt całkowity Brak danych Institut Laue Langevin (ILL) Francja Wkład UE Brak danych Adres Avenue des Martyrs 38042 Grenoble Zobacz na mapie Koszt całkowity Brak danych
