3.012 fund of mat sci: structure – lecture 16 structure of ... · 3.012 fundamentals of materials...
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
3.012 Fund of Mat Sci: Structure – Lecture 16
STRUCTURE OF SOLIDS
Charge density in paraelectric and ferroelectric PbTiO3
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Homework for Mon Nov 7
• Study: Allen and Thomas 3.2.2 up to pag. 140, and 3.4
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Last time:
1. Symmetry operations: rotation, reflection, inversion, roto-inversion
2. Mirror+mirror=rotation3. Periodicity constrains rotations (1, 2, 3, 4, 6)
→ ten crystallographic point groups in 2d4. Bravais lattices5. International tables
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
BravaisLattice
Triclinic
Monoclinic
Orthorhombic
Tetragonal
Trigonal
Cubic
Hexagonal
Parameters Simple(P)
VolumeCentered (I)
BaseCentered (C)
FaceCentered (F)
a1 = a2 = a3α12 = α23 = α31
a1 = a2 = a3α23 = α31 = 900
α12 = 900
a1 = a2 = a3α12 = α23 = α31 = 900
a1 = a2 = a3α12 = α23 = α31 = 900
a1 = a2 = a3α12 = 1200
α23= α31= 900
a1 = a2 = a3α12 = α23 = α31 = 900
a1 = a2 = a3α12 = α23 = α31 < 1200
a3
a1
a2
4 Lattice Types
7 C
ryst
al C
lass
es
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Compound ops. with translations:4) Glides
Illustration of glide symmetry removed for copyright reasons.See p. 99, figure 3.8 in Allen, S. M., and E. L. Thomas. The Structure of Materials. New York, NY: J. Wiley & Sons, 1999.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Compound ops. with translations:5) Screw (in 3 dim)
Illustration of rotation and parallel translation removed for copyright reasons. See p. 130, figure 3.38 in Allen, S. M., and E. L. Thomas. The Structure of Materials. New York, NY: J. Wiley & Sons, 1999.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Figure of object repetition removed for copyright reasons.See page 133, Figure 3.39 in Allen, S. M., and E. L. Thomas. The Structure of Materials. New York, NY: J. Wiley & Sons, 1999.Tn mτ =
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Space groups
• All possible combinations of point group symmetries with translations
• 230 in total• We have seen 14 (Bravais lattices)• Incorporate all possible translation with
symmetries, and add screw axis and glide planes
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Bravais lattices: simple cubic
α-phase of polonium….3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Figure by MIT OCW.
Figure by MIT OCW.
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Bravais lattices: body-centered cubic
Ba, Cr, Cs, Fe, K, Li, Mo, Na, Nb, Rb, Ta, Tl, V, W…3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Bravais lattices: body-centered cubic
Figure by MIT OCW.
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Primitive unit cell and conventional unit cell
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Wigner-Seitz cell
Figure by MIT OCW.
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Crystal Structure = Lattice + Basis
Crystal Structure = Lattice + basis
Lattice
BasisFigure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Bravais lattices: face-centered cubic
Ag, Al, Au, Ca, Cu, Ir, Ni, Pb, Pd, Pt, Sc, Sr…
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Close-Packed Structures
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Interstitials in Close-Packed
Octahedral Tetrahedral
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Interstitials in Close-Packed
(001) (100) (010)
(011)(110)
(111) (111)
(101)
(111)
Figure by MIT OCW.
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Diamond and Zincblend
3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Perovskites
Figure by MIT OCW.
Perovskite CaTio3
Figure by MIT OCW.
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Sodium Chloride (rocksalt)
Source: Wikipedia
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3.012 Fundamentals of Materials Science: Bonding - Nicola Marzari (MIT, Fall 2005)
Cesium Chloride
Image of the structure of Cesium Chloride removed for copyright reasons.