lezione solidi
TRANSCRIPT
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IL RETICOLO CRISTALLINOE LA CELLA ELEMENTARE
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TRICLINO MONOCLINO
ORTOROMBICO TETRAGONALE
ROMBOEDRICO
CUBICO
SETTE SISTEMI CRISTALLINI
ESAGONALE
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Celle elementari del sistema cubico
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Le tre celle elementari cubiche
Cella elementare cubica semplice
numero di coordinazione = 6
atomi/cella elementare = 1/8 * 8 = 1
1/8 di atomo in 8 vertici
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Le tre celle elementari cubiche
Cella elementare cubica
a corpo centrato
1/8 di atomo in 8 vertici
1 atomo nel centro della
cella
atomi/cella elementare = (1/8*8) + 1 = 2
numero di coordinazione = 8
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Le tre celle elementari cubiche
Cella elementare cubica
a facce centrate
numero di coordinazione = 12atomi/cella elementare = (1/8*8)+(1/2*6) = 4
1/8 di atomo in 8 vertici
1/2 di atomo nel centro di
6 facce
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Impaccamento di sfere
Cella elementare cubica semplice (52%)
cella elementare cubica
a corpo centrato (68%)
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FACE CENTERED CUBIC (fcc)OR CUBIC CLOSE PACKED
HEXAGONAL CLOSE PACKED (hcp)
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Impaccamentocubico compatto dell’argon
solidificato Impaccamentocubico compatto del metano solidificato
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Il carattere ionico dei legami chimici
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Carattere ionicopercentuale in funzione della differenza
di elettronegatività (Dx)
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DIAMANTE
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GRAFITE
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FULLERENE - C60
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DIOSSIDO DI SILICIO SIO2 CRISTALLINO E AMORFO
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SILICATI
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SILICATI
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LA STRUTTURA DEL CLORURO DI SODIO - NACL
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La struttura del cloruro di cesio - CsCl
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La struttura della zincoblenda
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La struttura della fluorite
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Strutture cristalline dei metalli
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A
B
C
D FE
A’
B’
DIFFRAZIONE A RAGGI X