Section 1: Crystal Structure
Wigner-Seitz primitive cell. All the space of the crystal may be filled by these primitive cells, by translating the unit cell by the lattice vectors. y x a1 a2 a T Fig.4 . Physics 927 E.Y.Tsymbal 3 The unit cell can be primitive and non-primitive (or conventional). The unit cell discussed above is
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Section 5: Lattice Vibrations - University of Nebraska ...
unlcms.unl.eduPhysics 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.
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 …
Section 15: Magnetic properties of materials
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Section 2: X-ray Diffraction and Reciprocal Lattice
unlcms.unl.eduPhysics 927 E.Y.Tsymbal Diffraction condition and reciprocal lattice.Later von Layer introduced a different approach for x-ray diffraction. He regarded a crystal as composed of identical atoms placed at the lattice sites T and assumed that each atom …
Section 16: Magnetic properties of materials (continued)
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 ...
Section 4: Elastic Properties
unlcms.unl.eduThe elastic properties are described by considering a crystal as a homogeneous continuum medium rather than a periodic array of atoms. In a general case the problem is formulated as follows: (i) Apply forces, which are described in terms of stress σ, and determine displacements of atoms which are described in terms of strain ε.
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
unlcms.unl.edulevel of reliability in an LRFD-format specification. AASHTO chose this reliability to be 3.5 @ inventory level And 2.5 @ operating level Calibration continued Only the strength limit states of the LRFD Specifications are calibrated based upon the theory of structural reliability, wherein statistical load and resistance data are required.
Section 4: Electrostatics of Dielectrics
unlcms.unl.eduThis property of dielectrics is known as polarizability. Basically, polarizability is a consequence of the fact that molecules, which are the building blocks of all substances, are composed of both positive charges (nuclei) and negative charges (electrons). When an electric field
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