Section 5: Lattice Vibrations - University of Nebraska ...
Physics 927 E.Y.Tsymbal 3 The physical distinction between the two velocities is that vp is the velocity of the propagation of the plane wave, whereas the vg is the velocity of the propagation of the wave packet. The latter is the velocity for the propagation of energy in the medium.
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Section 3: Crystal Binding - University of Nebraska–Lincoln
unlcms.unl.eduFor example a crystal of sodium chloride is more stable than a collection of free Na and Cl atoms. This ... described by a central field repulsive potential of the form λexp(−r / ρ), where λ and ρ are some ... theory of ionic crystals. In general it is not possible to …
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unlcms.unl.eduSection 16: Magnetic properties of materials (continued) Ferromagnetism Ferromagnetism is the phenomenon of spontaneous magnetization – the magnetization exists in the ferromagnetic material in the absence of applied magnetic field. The best-known examples of ferromagnets are the transition metals Fe, Co, and Ni, but other elements and alloys ...
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Section 7: Free electron model - UNLcms: UNL Content ...
unlcms.unl.eduThe wavefunctions (7.10) are the eigenfunctions of the momentum p =−i∇, which can be easily seen by differentiating (7.10) : pψk (r) =−i∇ψk (r) =kψk (r). (7.13) The eigenvalue of the momentum is k . The velocity of the electron is defined by v =p/m =k /m.
HL-93 vs HS20 - University of Nebraska–Lincoln
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