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Midterm

1M03 Crib Sheet - 1st Midterm

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Department
Materials Science and Engineering
Course Code
MATLS 1M03
Professor
Russou

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Vanessa Raponi 1M03 Crib Sheet
Chapter 2
**where attract is +ve and repel is ve...ALWAYS **
**when FNet is zero, bond length is found**
**ensure abs value, ‘r’ in m**
**High bonding NRG -> High melting temp**
Primary Bonds:
1. Ionic: Formed between a metal cation and a NM anion.
Thermally and electrically insulated; hard; brittle; NOT
ductile. (ie. NaCl, KBr)
2. Covalent: Shared e- pairs. NOT the only form of bonding in
polymers (ie. Diamond)
3. Metallic: Good heat and electric conductors (ie. Al, Ti, all
metals), tends to form close-packed structures (crystals)
Secondary Bonds: Hydrogen (NOF), Van der Waals (LD) and
Dipole
**From weakest to strongest: Van der Waals, dipole,
hydrogen, metallic, covalent, ionic**
**Bond length corresponds to x-intercept of Force graph,
Bond NRG corresponds to y-value of lowest point on NRG
graph**
Chapter 3
Crystalline: atoms arranged into a periodic array; structure
Non-Crystalline/Amorphous: “without form”, glassy, no long-
range systematic or regular atomic structure. No ordered
arrangement over a long distance.
Allotropy/Polymorphism: going from one structure to another.
**Only occurs in crystalline materials!**
Polycrystalline: “grains”, multiple crystal structures
Grain Boundary: region where atomic mismatch overlaps
Anisotropy: direction of crystallography **as structural
symmetry decreases, anisotropy increases**
Isotropy: property independent of direction
Crystalline
Amorphous
Mixed
Metals
Usually
Rarely
Never
Ceramics
Often
Often
Often
Polymers
Never
Usually
Sometimes
FCC: ABCABCA…close-packed sequence
HCP: ABABABAB…close-packed sequence
**volume for HCP is (3sin60)(4R2)(1.63(2R)) in place of a3**
**FCC has higher density than BCC**
Miller Indices: NO FRACTIONS!! Multiply by a scalar for lines.
With planes, just look at intercepts, reciprocals, reductions (if
no intercepts, which is equivalently 0)
** **
**n=1,
𝜃
is sometimes
𝜃/2
, in these Qs use this a, not a from chart**
**'Interplanar spacing
is d and lattice
parameter is a**

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Description
Vanessa Raponi – 1M03 Crib Sheet Chapter 2 Chapter 3 Crystalline: atoms arranged into a periodic array; structure Non-Crystalline/Amorphous: “without form”, glassy, no long- range systematic or regular atomic structure. No ordered **where attract is +ve and repel is –ve...ALWAYS ** arrangement over a long distance. **when F Netis zero, bond length is found** Allotropy/Polymorphism: going from one structure to another. **Only occurs in crystalline materials!** Polycrystalline: “grains”, multiple crystal structures Grain Boundary: region where atomic mismatch overlaps Anisotropy: direction of crystallography **as structural **ensure abs value, ‘r’ in m** symmetry decreases, anisotropy increases** Isotropy: property independent of direction Crystalline Amorphous Mixed **High bonding NRG -> High melting temp** Metals Usually Rarely Never Primary Bonds: Ceramics Often Often Often 1. Ionic: Formed between a metal cation and a NM anion. Polymers Never Usually Sometimes Thermally and electrically insulated; hard; brittle; NOT ductile. (ie. NaCl, KBr) 2. Covalent: Shared e pairs. NOT the only form of bonding in polymers (ie. Diamond) 3. Metallic: Good heat and electric conductors (ie. Al, Ti, all metals), tends to form close-packed structures (crystals) Secondary Bonds: Hydrogen (NOF), Van der Waals (LD) and Dipole **From weakest to strongest: Van der Waals, dipole, hydrogen, metallic, covalent, ionic** FCC: ABCABCA…close-packed sequence HCP: ABABABAB…close-packed sequence 2 3 **volume for HCP is (3sin60)∙(4R )∙(1.63(2R)) in place of a ** **FCC has higher density than BCC** Miller Indices: NO FRACTIONS!! Multiply by a scalar for lines. With planes, just look at intercepts, reciprocals, reductions (if no intercepts,∞ which is equivalently 0) ** ** **'Interplanar spacing is d and lattice **Bond length corresponds to x-intercept of Force graph, parameter is a** Bond NRG corresponds to y-value of lowest point on NRG **n=1, 𝜃is sometimes 𝜃/2, in these Qs use this a, not a from chart** graph** Ch
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