Materiale electrotehnice noi
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Transcript of Materiale electrotehnice noi
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I Prof.dr.ing.Florin Ciuprina
Materiale electrotehnice noi
Magnetizarea materialelor
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Structura disciplineiCapitolul Conţinutul
1 Fenomene in materialele electrotehnice1.1. Conductia electrica1.2. Polarizarea electrica1.3. Magnetizarea materialelor1.4. Pierderi in materialele electrotehnice
2 Materiale conductoare noi2.1. Materiale conductoare clasice2.2. Conductori organici si moleculari2.3. Supraconductori2.4. Materiale pentru realizarea de memristori2.5. Aplicatii moderne ale materialelor conductoare
3 Materiale semiconductoare noi3.1. Materiale semiconductoare clasice3.2. Polimeri semiconductori3.3. Materiale semiconductoare nanostructurate3.4. Aplicatii moderne (celule solare, microprocesoare de inalta frecventa, ecrane TV, laseri)
4 Materiale dielectrice noi4.1. Evolutia materialelor dielectrice4.2. Straturi subtiri4.3. Nanodielectrici4.4. Oxizi metalici4.5. Aplicatii
5 Materiale magnetice noi5.1. Evolutia materialelor magnetice5.2. Materiale magnetice amorfe5.3. Materiale magnetice nanostructurate (nanocristaline, organice)5.4. Fire si filme subtiri din materiale magnetice5.5. Aplicatii moderne (miezuri magnetice, memorii, hard-discuri, carduri magnetice)
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
1. Fenomene in materiale electrotehnice
Conductia electrica Polarizarea electrica Magnetizarea materialelor Pierderi in materialele electrotehnice
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Magnetizarea materialelor
Intensitatea campului magnetic: H [A/m]
Inductia magnetica: B [T]
Magnetizatia:
pt MMM HM mt
pmpt MHMMHMHB 0000 )1()()(
0 cand atunci , pMHB mr 1 r 0
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Materiale:
diamagnetice – particule magnetic nepolare paramagnetice feromagnetice – particule magnetic polare ferimagnetice antiferomagnetice
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Materiale:
diamagnetice – materiale nemagnetice paramagnetice feromagnetice ferimagnetice antiferomagnetice
26 1010 m
HM mt
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Materiale:
diamagnetice paramagnetice feromagnetice – materiale magnetice ferimagnetice antiferomagnetice
62 1010 m
HM mt
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Camp magnetic activ (interior):
enemagnetic materiale - 0
magnetice materiale - 1010 43
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Diamagnetismul
Materiale diamagnetice:
Cu, Au, Ag, Zn, Pb, gaze nobile, etc.
Joseph Larmor (1857-1942)
matematician si fizician irlandez
liniara HM mdd
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
ParamagnetismulMateriale paramagnetice: Al, Cr, Mn, Na, etc.
Stefan Procopiu (1890-1972),
fizician roman
neliniara HM mpp
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
FeromagnetismulMateriale feromagnetice: Fe, Co, Ni, Gd, aliaje.
biunivoca estenu si neliniara este HM m53 1010 m
Pierre-Ernest Weiss (1865-1940) fizician francez
Felix Bloch (1905-1983) fizician american nascut in Elvetia
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Feromagnetismul
Mecanismul magnetizarii:
deplasarea peretilor Bloch
Relatia Curie-Weiss:
Pierre Curie (1859-1906) fizician francez
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Feromagnetismul
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Ferimagnetismul si antiferomagnetismul
Particule magnetic polare Domenii magnetice & pereti Bloch Momentele magnetice ale atomilor
diferiti – antiparalele in acelasi domeniu
mx ≠ my – materiale ferimagnetice
mx = my – materiale antiferomagnetice
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Materiale ferimagnetice
mx ≠ my – materiale ferimagnetice
32 1010 m
Ωm 1010 61
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Facultatea de Inginerie Electrica, Materiale electrotehnice noi, 2010-2011, master IPE, anul I
Fenomene in materiale: magnetizarea materialelor
Materiale antiferomagnetice
mx = my – materiale antiferomagnetice
23 1010 m
Louis Eugene Felix Neel(1904-2000), fizician francez