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| Electronegativity INCREASES from _ to _ along rows of the periodic table |
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| Electronegativity INCREASES from _ to _ along columns of the periodic table |
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Term
r vs a in sp3?
r vs a in BCC?
r vs a in FCC? |
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Definition
((root 3)*a)/4 = 2 r
root 3 * a = 4 r
root 2 * a = 4 r |
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Definition
| Corresponds to the number of nearest neighbors surrounding a central cation |
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8 = cubic
6 = octahedron
4 = tetrahedron
3 = triangle |
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Term
| Hume-Rothery Solubility rules |
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Definition
1) atomic size difference can't be more than 15%
2) No appreciable electronegativity difference (i.e. they can't form compounds)
3) Solid crystal structure elements must match
4) Both elements have same valence |
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HCP stacking arrangement
FCC stacking arrangement |
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| Two most important considerations for solubility in metal alloys? |
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Definition
1) Crystalline Structure
2) The atomic size |
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| What two factors determine crystal structure of a significantly ionic ceramic compound? |
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Definition
1) The size of the ions
2) charge neutrality |
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| Requires heat to make it formable and retains its shape upon cooling. Repeatable process. Chain polymers with dipole bonding between chains |
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| Formed by heated/catalyzed rxn. Cross-linked structure. Cannot be remelted and reprocessed after forming b/c they decompose |
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