9 KB55 KB8 KB199219991998Kobe, SpomenkaKomelj, Matejletnik:32številka:6str. 513-514ISSN:1318-0010COBISSID:92842URN:URN:NBN:SI:doc-7AAZ33XQenInštitut za kovinske materiale in tehnologijeŽelezarna JeseniceŽelezarna RavneŽelezarna ŠtoreKovine zlitine tehnologijealuminijAluminij MostaraluminumferomagnetimagnetineodimzlitineželezoCalculation of the Curie temperature in the system Nd2Fe(17-x)Alx| Izračun Curiejeve temperature v sistemu Nd2Fe(17-x)Alx|The ferromagnetic alloy ?$Nd_2Fe_{17}$? has a low Curie temperature (=330K). By substituting some of the Fe atoms in the crystal latice with Al atoms the volume of the unit cell is increased and consequently, the Curie temperature increases up to a maximum of =470K. Therefore the alloy ?$Nd_2Fe_{17-x}Al_x$? is potentially suitable as a permanent magnet material. From the electronic structure we have predicted the relative changes of the Curie temperature in the spin fluctuation approximation. We have calculated the electronic structure within the framework of the Density Theory and the Local Spin Density Approximation using the LMTO methodFeromagnetna zlitina ?$Nd_2Fe_{17}$? ima nizko Curiejevo temperaturo (=330K). Z zamenjavo nekaterih atomov Fe v kristalni mreži z atomi Al se poveča prostornina osnovne celice in zato tudi Curiejeva temperatura do največ =470K. To pomeni, da je zlitina ?$Nd_2Fe_{17-x}Al_x$? potencialno primerna kot material za izdelavo trajnih maganetov. Iz elektronske strukture smo v okviru približka spinskih fluktuacij napovedali relativne spremembe Curiejeve temperature zaradi prisotnosti Al. Elektronsko strukturo smo izračunali v okviru teorije gostotnih funkcionalov in približka lokalne spinske gostote z uporabo metode LMTONadaljuje se kot: Materiali in tehnologijeTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaInštitut za kovinske materiale in tehnologije