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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 9 pps

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 1 doc

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 1 doc

... Constant E gives ever-increasing v © E.A. Fitzgerald- 199 9 4 3.225 15 • τ~10 -1 4 sec for metals in Drude model Extracting Typical τ for Metals © E.A. Fitzgerald- 199 9 3.225 16 Thermal ... Tuller-2001 For R 9 3.225 9 Equation of Motion - Impact of Collisions Assume: • probability of collision in time dt = dt/τ • time varying field F(t) v(t+dt) = ( 1- dt/τ) {v(t) +dv} = ( 1- dt/τ) ... 1 τ p E∞ =− τ p t -eEτ τ If the environment has a lot of collisions, mvavg=-eEτ vavg=-eEτ/m µ τ = e m © E.A. Fitzgerald- 199 9 Eµ−=Define v Mean-free Time Between Collisions,...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 5 ppt

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 5 ppt

... Eg=1.1eV, and let µe and µh be approximately equal at 1000cm2/V-sec (very good Si!). σ~1010cm -3 *1.602x10 -1 9 *1000cm2/V-sec=1.6x10 -6 S/m, or a resistivity ρ of about 106 ohm-m max. ... Fitzgerald- 199 9 ) 7 3.225 11 Density of Thermally Promoted of Carriers ∫ ∞ = cE dEEgEfn )()( Density of electron states per volume per dE Fraction of states occupied at a particular ... τ © E. Fitzgerald- 199 9 3 3.225 19 Expected Temperature Behavior of Doped Material (Example:n-type) • 3 temperature regimes ln(n) 1/T Intrinsic Extrinsic Freeze-out Eg/2kb Eb/kb...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 10 pps

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 10 pps

... range 500 - 90 0 °C • Extrapolated room temperature conductivity: σ = 4.4×10 -1 8 S cm -1 8 9 10 11 12 13 10 -7 10 -6 10 -5 10 -4 Y-cut σ0 = 2.1 S cm -1 EA = 105 kJ mol -1 104/T ... Photo Electro-chemical Etching - PEC • Electro-chemical etching p-type + - Light source • Photo electro-chemical etching + - h+h+semiconductor electrolyte Light source n-type 3.225 ... 23.02.2001 - 27.02.2001Steuerdatei: allgas_h2.st gMeßprotokoll: 273Schematic of Gas Sensor Structure3.22512© H.L. Tuller-2001MicroElectroMechanical Systems - MEMSMicromachining - Application of...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 9 pps

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 9 pps

... 0 .99 5 1,005 -1 6 -4 0 -5 -4 -3 -2 -1 0 1 donoracceptor -2 0 -1 2 -8 donor dopedacceptor doped 2 3.225 15 Designer Wavelengths Variation of band-gap energy with composition x of ... conductivity (I. Kosacki and H.L. Tuller, Sensors & Actuators B 2 4-2 5, 370 ( 199 5).) High Strain (Pb0 .98 La0.02(Zr0.7Hf0.3)1-xTixO3 AFE-FE System (C. Heremans and H.L. Tuller, J. ... 10 -2 0 10 -1 5 10 -1 0 10 -5 100 0,1 1 750°C 800°C 90 0°C 850°C 95 0°C electrical conductivity / (Ω cm) -1 pO2 / bar m = 0,2 Sr(Ti0,65Fe0,35)O3 Response times T / °C t 90 ...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 3 pot

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 3 pot

... E. Fitzgerald- 199 9 3.22518Ψ must be able to represent everything from a particle to a wave (the two extremes)Unification: Wave-particle Dualitywaveparticle(tkxiAeω−=Ψk and p known ... Fitzgerald- 199 9 )))33.2255Effect of Temperature (T>0): Coupled electronic- thermal properties in conductors• Electrons at the Fermi surface are able to increase energy: responsible for properties • ... MaterialmpmkE22222==hEk∆k=2π/LQuasi-continuouskmkEmkdkdE∆=∆=22hhstateselectronsEnEn-1En+1m=+1/2 ,-1 /2All e- in box accounted forEFkFkFTotal number of electrons=N=2*2kF*L/2π© E. Fitzgerald- 199 9...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 6 pps

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 6 pps

... when you join these together? © E. Fitzgerald- 199 9 3.225 12 - - ++ + + Holes diffuse Electrons diffuse ++ + + - - - - ++ + + - - ++ + + An electric field forms due to ... cavityJhdiff © E. Fitzgerald- 199 9 Potential Wells - Heterojunction Lasers Energy bands of a light-emitting diode under forward bias for a double heterojunction AlGaAs-GaAs-AlGaAs structure. © H.L. ... device”EcEFEvnnnppnppeVbieVbiTkVVenpbabienn)(−−=TkVVepnbabiepp)(−−=+eVa-eVa© E. Fitzgerald- 199 973.22513Joining p and nEcEFEvpnCarriers flow under driving force of diffusion until EFis flat - - ++++Holes diffuseElectrons...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 8 pdf

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 8 pdf

... Tuller, 2001 W6 3.225 7 Characteristics of Optical Fiber © E. Fitzgerald- 199 9 3.225 8 Characteristics of Optical Fiber © E. Fitzgerald- 199 9 4 3.225 3 Ferroelectrics • ‘Confused’ ... − = 1 © E. Fitzgerald- 199 9 9 3.225 11 Interaction of the d orbitals of a central ion with six ligands in an octahedral arrangement. Octahedral Environment of Transition Metal Ion © ... 103.225 19 Dielectric Loss© E. Fitzgerald- 199 9• For convenience, imagine a low density of molecules in the gas phase• C-M can be ignored for simplicity• There will be only electronic and orientational...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 4 pps

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 4 pps

... are:)n=1,2,3,…=0,1,2,…,n-1ml =- , - +1,…,0,…, , (ms=+ or - 1/2)llll0 -1 3.6eVU(r)© E. Fitzgerald- 199 9)in -1 3.225 9 Diffraction Picture of the Origin of Band Gaps Probability Density=probability/volume ... thereπ/a−π/a© E. Fitzgerald- 199 9 ))))) 9 3.22517Relationship between Quantum NumbersspdOrigin of the periodic tablessp© E. Fitzgerald- 199 93.22518Bonding and Hybridization• Energy ... the valence band to the conduction bandEcnear band gapEvnear band gapEkE=hνCreates a ‘hole’ in the valence band© E. Fitzgerald- 199 9 3.2258Holes and Electrons• Instead of tracking...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 11 potx

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 11 potx

... material Material Type χ Paramagnetic +10 -5 -1 0 -4 Diamagnetic -1 0 -8 -1 0 -5 Ferromagnetic +105 2 5 3.225 5© E. Fitzgerald- 199 9 Microscopic Source of Magnetization • No monopoles • magnetic ... 2(atomicdistance cinteratomi2>≡arrJ is a function of distance!83.2258© E. Fitzgerald- 199 9FerromagnetismMTTC() ( )() ( )1. 4-1 .3 0.3 7-0 .33 ≈−∝≈−∝−γχβγβTTTTTTMCCHB=H+4πM‘normal’ ... µr = B/ µ0H = 1 + (M/H) = 1 + χm Magnetic Permeability and Susceptibility 4 3.225 4© E. Fitzgerald- 199 9 Maxwell and Magnetic Materials • Ampere’s law • For a permanent magnet, there...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 2 pot

Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 2 pot

... e-i(kx-ωt) are all waves e -i(kx-ωt) is the complex one and is the most general real imaginary A Acosθ iAsinθθ e iθ=cosθ+isinθ © E.A. Fitzgerald- 199 9 1 3.225 11 Wiedmann-Franz ... out of phase with E ω<<1/τ, p in phase with E ωi eE p 0 0 = 0, →∞→ pω τ00 eEp = © E.A. Fitzgerald- 199 9 3.225 2 Complex Representation of Waves sin(kx-ωt), cos(kx-ωt), and ... E.A. Fitzgerald- 199 9 3.225 10 Success and Failure of Free e- Picture • Success – Metal conductivity – Hall effect valence=1 – Skin Depth – Wiedmann-Franz law • Examples of Failure –...
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