Obiettivo A study is proposed on magnetic interactions and thermo-magnetic properties of hard magnetic materials which are of technical interest. The emphasis will be on new classes of materials like the R(20)iron(14)carbon and the R iron(10)M(2)(where R is an element and M is a metal) compounds. The study of high field magnetisation and neutron scattering phenomena on R cobalt(5) and R titanium(17) are emphasised in order to deduce consistent sets of microscopic parameters by which the basic interactions in hard materials can be understood. The search for new crystal growth techniques is essential for this study.By means of the Czochralski method single crystals of R nickel(5), with R=yttrium, lanthanum, praseodymium, neodymium, gadolinium, terbium, dysprosium, holmium and erbium have been grown. Also large single crystals of yttrium(2)iron(17), holmium(2)iron(17) and erbium(2)iron(17) have been obtained. Pseudo binary single crystals have been made of R(cobalt(1-x)nickel(x))(5), with R=yttrium, gadolinium, praseodymium. Intense field magnetisation measurements have been performed on crystals of praseodymium(nickel(x)cobalt(1-x))(5) and praseodymium nickel(5) at low temperature. Exotic behaviour is observed, associated with the crystal field level scheme of praseodymium(3+). SPD experiments have been done rare earth iron(1-x) compounds, to study the influence of small deviations from the nominal composition. A complete characterisation of the temperature dependence of the magnetic properties was carried out for R-iron-vanadium (R=yttrium, erbium, terbium). The spin reorientation transition was studied, using susceptibility measurements. The temperature dependence of the saturation magnetisation and of the rare earth and iron sublattice anisotropies were studied using a standard VSM and SPD technique respectively. The parallel and perpendicular magnetostriction in R(2)iron(14)boron and R iron(10)vanadium(2) were measured in high pulsed magnetic fields. Exchange and crystal field interactions were studied by polarised neutron diffraction measurements on dysprosium iron(11)titanium and erbium(2)cobalt(17). The moments obtained for rare earth ions are in agreement with magnetisation measurements on these materials.A study is proposed on magnetic interactions and thermo-magnetic properties of hard magnetic materials which are of technical interest. The emphasis will be on new classes of materials like the Rd2Fe14C and the RFe10M2 compounds. The study of high-field magnetization and neutron-scattering phenomena on RCo5 and R2T17 are emphasized in order to deduce consistent sets of microscopic parameters by which the basic interactions in hard materials can be understood. The search for new crystal-growth techniques is essential for this study. Campo scientifico engineering and technologymaterials engineeringcrystalsnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural scienceschemical sciencesinorganic chemistrymetalloids Programma(i) FP2-BRITE/EURAM 1 - Specific research and technological development programme (EEC) in the fields of industrial manufacturing technologies and advanced materials applications (BRITE/EURAM), 1989-1992 Argomento(i) Data not available Invito a presentare proposte Data not available Meccanismo di finanziamento Data not available Coordinatore University of Amsterdam Contributo UE Nessun dato Indirizzo Valkenierstraat 65 1018 XE AMSTERDAM Paesi Bassi Mostra sulla mappa Costo totale Nessun dato Partecipanti (3) Classifica in ordine alfabetico Classifica per Contributo UE Espandi tutto Riduci tutto Centre National de la Recherche Scientifique (CNRS) Francia Contributo UE Nessun dato Indirizzo 25 avenue des Martyrs 38042 Grenoble Mostra sulla mappa Costo totale Nessun dato ICAM UNIVERSITY OF ZARAGOZA Spagna Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato Istituto Maspec Parma Italia Contributo UE Nessun dato Indirizzo Mostra sulla mappa Costo totale Nessun dato