Objectif 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. Champ scientifique engineering and technologymaterials engineeringcrystalsnatural scienceschemical sciencesinorganic chemistrytransition metalsnatural scienceschemical sciencesinorganic chemistrymetalloids Programme(s) 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 Thème(s) Data not available Appel à propositions Data not available Régime de financement Data not available Coordinateur University of Amsterdam Contribution de l’UE Aucune donnée Adresse Valkenierstraat 65 1018 XE AMSTERDAM Pays-Bas Voir sur la carte Coût total Aucune donnée Participants (3) Trier par ordre alphabétique Trier par contribution de l’UE Tout développer Tout réduire Centre National de la Recherche Scientifique (CNRS) France Contribution de l’UE Aucune donnée Adresse 25 avenue des Martyrs 38042 Grenoble Voir sur la carte Coût total Aucune donnée ICAM UNIVERSITY OF ZARAGOZA Espagne Contribution de l’UE Aucune donnée Adresse Voir sur la carte Coût total Aucune donnée Istituto Maspec Parma Italie Contribution de l’UE Aucune donnée Adresse Voir sur la carte Coût total Aucune donnée
