Cristallographie Flashcards

0
Q

Coordinence

A

Nombres de plus proches voisins

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1
Q

Compacité

A

Volume des atomes /volume de la maille

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2
Q

Multiplicité

A

Nombres d’atomes entiers dans une maille

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3
Q

Cubique face centrée

A

Multiplicité = 4 Coordinence = 12 Contact : selon la diagonale du cube Compacité = 0,74 -> compacte

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4
Q

Sites octaèdriques

A

Selon l’arrête du cube plus au centre (au milieu des atomes au milieu des faces)

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5
Q

Sites tetraèdriques

A

Selon la demi-diagonale du cube

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6
Q

Hexagonale compacte

A

Multiplicité = 2 c = a (8/3)^1/2

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7
Q

Types de cristaux

A

Metalliques et ioniques

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8
Q

Types d’alliages

A

Substitution et insertion

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9
Q

CsCl

A

Cubique centrée

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10
Q

NaCl

A

Cubique face centrée de Cl- Sites octaèdriques pour Na+

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11
Q

ZnS ou blinde

A

Cubique face centrée des S2- Moitié des sites tetraèdriques en quinquonce pour Zn2+

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12
Q

CaF2

A

Cubique face centrée de Ca2+ Tous les sites tetraèdriques de F-

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13
Q

Graphite

A

Hexagonale enquinquonce de Carbone

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14
Q

Interactions de Van der Valls

A

Keesom : dipoles permanents Debye : dipole petmanent dipole induit London : dipole instantané - dipole induit Interactions en 1/r^6

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