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
... 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-...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 5 ppt
... Eg=1.1eV, and let µ e and µ h be approximately equal at 1000cm 2 /V-sec (very good Si!). σ~10 10 cm -3 *1.602x10 -1 9 *1000cm 2 /V-sec=1.6x10 -6 S/m, or a resistivity ρ of about 10 6 ohm-m max. ... Fitzgerald- 199 9 ) 7 3.225 11 Density of Thermally Promoted of Carriers ∫ ∞ = c E dEEgEfn )()( Density of electron states per volume per dE Fraction of s...
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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 σ 0 = 2.1 S cm -1 E A = 105 kJ mol -1 10 4 /T ... Photo Electro-chemical Etching - PEC • Electro-chemical etching p-type + - Light source • Photo electro- chemical etching + - h + h + semiconducto...
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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 donor acceptor -2 0 -1 2 -8 donor doped acceptor 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 (Pb 0 .98 La 0.02 (Zr 0.7 Hf 0.3 ) 1-x Ti x O 3 AFE...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 3 pot
... E. Fitzgerald- 199 9 3.225 18 Ψ must be able to represent everything from a particle to a wave (the two extremes) Unification: Wave-particle Duality wave particle ( tkxi Ae ω− =Ψ k and p known ... Fitzgerald- 199 9 ) ) ) 3 3.225 5 Effect of Temperature (T>0): Coupled electronic- thermal properties in conductors • Electrons at the Fermi surface are able to increase energy: respons...
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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 ... cavity J hdiff © E. Fitzgerald- 199 9 Potential Wells - Heterojunction Lasers Energy bands of a light-emitting diode under forward bias for a double heterojunction...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 8 pdf
... Tuller, 2001 W 6 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 Me...
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Materials Science and Engineering - Electronic and Mechanical Properties of Materials Part 4 pps
... are:) n=1,2,3,… =0,1,2,…,n-1 m l =- , - +1,…,0,…, , (m s =+ or - 1/2) l l l l 0 -1 3.6eV U(r) © E. Fitzgerald- 199 9 ) in -1 3.225 9 Diffraction Picture of the Origin of Band Gaps Probability Density=probability/volume ... there π/a −π/a © E. Fitzgerald- 199 9 ) ) ) ) ) 9 3.225 17 Relationship between Quantum Numbers s p d Origin of the periodic table s s p ©...
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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 +10 5 2 5 3.225 5 © E. Fitzgerald- 199 9 Microscopic Source of Magnetization • No monopoles • magnetic ... 2(atomic distance cinteratomi 2 >≡ a r r J is a function of distance! 8 3.225 8 © E. Fitzgerald- 199 9 Ferromagnetism M T T C () ( ) () ( ) 1. 4-1 .3...
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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 iAsinθ θ 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 ω i eE p 0 0 = 0, →∞→ pω τ 00 eEp = © E.A. Fitzgerald- 199 9 3.225 2 Complex Representation of Waves sin(kx-ωt), cos(k...
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