12 -14 c-spin_paramagnetism

1. Pertemuan 13 FISIKA ZAT PADAT SPIN PARAMAGNETIK Iwan Sugihartono, M.Si Jurusan Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam

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17. Nitrogen -Electrons -Protons and Neutrons 1s2 2p3 Electron Configuration of Nitrogen Wrong Wrong 2s2 Right 15/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

19. Magnetism is Measure in Magnetic Susceptibility ( χ m) The more susceptibility of a material has, the more magnetic property it processes 15/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id | Material Susceptibility χ m Vacuum 0 Water -1.2*10 -5 Bi -16.6*10 -5 C -2.1*10 -5 O2 0.19*10 -5 Al 2.2*10 -5 Fe 200 Co 70 Ni 110

21. Iron electron configuration Fe: 1s2,2s2,2p6,3s2,3p6,4s2,3d6 Fe: [Ar],4s2,3d6 Ar: 1s2,2s2,2p6,3s2,3p6 = [Ar] “ Core ” [Ar] -The electrons seems to align spontaneously -Pure quantum mechanics effect 15/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

24. Aluminum electron configuration [ Ne ]. 3s 2. 3p 1 Compare to Iron (Fe) [Ar] Fe: [Ar],4s2,3d6 the dipoles do not interact with one another and are randomly oriented in the absence of an external field due to thermal agitation, resulting in zero net magnetic moment What is the differences between the two?! 15/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

27. Applications of Magnetism MRI (magnetic resonance images) Superconductors 15/03/11 © 2010 Universitas Negeri Jakarta | www.unj.ac.id |

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