Chapter10 - Chapter 10 Electrical Properties Electrical...

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Unformatted text preview: Chapter 10 Electrical Properties Electrical Conduction Charge per carrier Mobility Energy bands and number of charge carriers Conductors, semiconductors and insulators Ionic conduction Conducting polymers Superconductivity Semiconductors Intrinsic and extrinsic conduction Role of defects Simple devices Microelectronics Chapter 10 Definitions at the end of the chapter Conductors Concept of band gaps Insulators Semiconductors Intrinsic Extrinsic Superconductors Electrical conductivities for a variety of materials at room temperature Metals and alloys [( -cm)-1 ] Al 3.8 x 10 5 Ag 6.3 x 10 5 Au 4.3 x 10 5 Co 1.6 x 10 5 Cr 7.8 x 10 4 Cu 6.0 x 10 5 Fe 1.0 x 10 5 Mg 2.2 x 10 5 Ni 1.5 x 10 5 Pd 9.2 x 10 4 Pb 4.8 x 10 4 Pt 9.4 x 10 4 Sn 9.1 x 10 4 Ta 8.0 x 10 4 Zn 1.7 x 10 5 Zr 2.5 x 10 4 Plain carbon steel (1020) 1.0 x 10 5 Stainless steel (304) 1.4 x 10 4 Gray cast iron 1.5 x 10 4 Electrical conductivities for a variety of materials at room temperature Ceramics [( -cm)-1 ] ReO 3 5.0 x 10 5 CrO 2 3.3 x 10 4 SiC 1.0 x 10-1 Fe 3 O 4 1.0 x 10 2 SiO 2 <10-14 A1 2 O 3 <10-14 Si 3 N 4 <10-14 MgO <10-14 Si 1.0 x 10-4 Ge 2.3 x 10-2 Electrical conductivities for a variety of materials at room temperature Polymer [( -cm)-1 ] Nylon 10-12-10-15 Polycarbonate 5 x 10-17 Polyethylene < 10-16 Polypropylene <10-15 Polystyrene <10-16 Polytetrafluoroethylene 10-18 Polyvinylchloride 10-12-10-16 Phenolformaldehyde 10-13 Polyesters 10-11 Silicones <10-12 Aetal 10-15 Metallic Bond Ion cores of 2+ charge Delocalized cloud of valence electrons Schematic of metallic bonds in solid magnesium Electrical Conduction V = IR Ohms Law Positive potential Negative potential A R L = 1 i i i i Nq N q = = = Charge Mobility Collisions Charge Mobility Thermal vibrations Foreign atoms Vacancies Reference Conductor Temperature ( C) o( -cm) e ( C-1 ) Al 20 2.65 x 10-6 0.0043 Ag 20 1.59 x 10-6 0.0041 Au 20 2.35 x 10-6 0.0040 Co 20 6.24 x 10-6 0.0060 Cr 1.29 x 10-5 0.0030 Cu 20 1.67 x 10-6 0.0068 Fe 20 9.71 x 10-6 0.0065 Mg 20 4.45 x 10-6 0.0065 Ni 20 6.84 x 10-6 0.0069 Pd 20 1.08 x 10-5 0.0038 Pb 20 2.06 x 10-5 0.0034 Pt 20 1.06 x 101....
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This note was uploaded on 02/03/2011 for the course MSE 2001 taught by Professor Tannebaum during the Spring '08 term at Georgia Institute of Technology.

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Chapter10 - Chapter 10 Electrical Properties Electrical...

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