PERIGO, E.A.TAKIISHI, H.MOTTA, C.C.FARIA, R.N.2014-07-152014-07-302014-07-152014-07-302007PERIGO, E.A.; TAKIISHI, H.; MOTTA, C.C.; FARIA, R.N. Microstructure and squareness factor: a quantitative correlation in (Nd, Pr)FeB sintered magnets. <b>Journal of Applied Physics</b>, v. 102, p. 113912-1 - 113912-4, 2007. DOI: <a href="https://dx.doi.org/10.1063/1.2821756">10.1063/1.2821756</a>. Disponível em: http://repositorio.ipen.br/handle/123456789/5173.0021-8979http://repositorio.ipen.br/handle/123456789/5173A quantitative correlation between the microstructure and squareness factor of R16 Fe76 B8 (R=Nd or Pr) sintered magnets is proposed. The expression was derived based on the micrographs of 19 magnets, making a total of more than 11 000 grains analyzed. This expression is independent of the determination of the sample's magnetic properties. Magnet processing conditions were used to modify the microstructure and, hence, the squareness factor. Six microstructural parameters-grain size, grain elongation, grain roundness, and their respective standard deviations-were quantified using an image analyzer software program. The squareness factor was higher for magnets with a microstructure showing rounder grains and a sharp size distribution. A comparison of the squareness factor obtained by the proposed expression with that calculated from the demagnetization curve showed a fairly good agreement. Some disparities were also found and are discussed herein.113912-1 - 113912-4openAccesssintered materialspermanent magnetsmagnetic propertiesmicrostructurepraseodymium alloysneodymium alloysmagnetsArtigo de periódico10210.1063/1.2821756