body-centered cubic (bcc) - wordpress.com · fcc rešetka i brillouinova zona zašto je grafit...
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Body-centered cubic (bcc)
Face-centered cubic (fcc)
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Difrakcija X-zraka na kristalima Ewaldova sfera:
von Laueov metod: NEmonohromatski, metod rotirajućeg kristala: kolimisan snop X-zračenja monohromatski, kolimisan snop, kristal rotira
Debye-Scherrerov metod: monohromatski, kolimisan snop; uzorak je polikristalan ili praškast
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Zonska struktura metala: Al, Cu, Ag
Al2713 : 1s2 2s2 2p6 3s2 3p1
Cu6429 : 1s2 2s2 2p6 3s2 3p6 3d10 4s1
Ag10847 : 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s1
fcc rešetka I Brillouinova zona
Zašto je grafit provodnik a dijamant izolator?
graphite diamond
eV
F
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Cu
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Cu
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4eV
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2eV
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bcc
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fcc
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fcc: I BZ
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II BZ
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h - inside the surface!
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e - in the pockets
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