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lec5 - Announcements NO CLASS NEXT MONDAY M lab and...

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1 Announcements • NO CLASS NEXT MONDAY !!! • M lab and discussion is held on W • T lab and discussion meet as scheduled • W lab and discussion do not meet • R lab does not meet, R discussion meets as scheduled • F discussion meets as scheduled Last Time ¤ Van der Waals Forces – Intermolecular interactions – Useful for trends in molecular properties ¤ Liquids – viscosity, surface tension ¤ Solids – metallic, ionic, molecular, network – hcp, ccp, fcp(rock salt), bcc(CsCl)
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2 Metallic Properties • Well ordered cations (+) in a delocalized array of electrons. Change nature of cations alloy. – Insulator - does not pass electricity, high R – Conductor - R increases with T – Semiconductor - R decreases with T – Superconductor - R = 0 below T c Metallic Materials Metal Mixtures – Alloys • Intentional metal defect site – solid solution – Homogeneous – brass, bronze – Heterogeneous – solder, amalgam – Substitutional – one–to–one replacement (15% radius difference) – Interstitial – random array (60% radius difference)
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