Materials Science and Engineering/Doctoral review questions/Crystallography
Appearance
Tensor 1
[edit | edit source]Propagation of Waves Along One-Dimensional Crystal with Two Kinds of Atoms
[edit | edit source]- Force-balance equations
- Trial solution
- With a given value of k, there are two different waves of angular frequency that may be propagated
Interpretation of the Solutions
[edit | edit source]Solutions of Small k
[edit | edit source]Solutions with positive sign at k = 0
[edit | edit source]Solutions with negative sign at k = 0
[edit | edit source]Acoustic and optic branch
Solutions with k = kmax
[edit | edit source]Displacements at kmx
[edit | edit source]Correspondence to the Identical-Atom Problem
[edit | edit source]The optical mode is not present in the case with one kind of atom.
Tensor 2
[edit | edit source]Wave Propagation in a Continuous One-Dimensional Medium
[edit | edit source]The wave velocity is independent of
Wave Motion on a Row of Identical Atoms
[edit | edit source]Total Number of Vibrational Modes that May be Supported by the Crystal
[edit | edit source]The number of vibration modes that can be supported is equal to the number of atoms in the crystal
Tensor 3
[edit | edit source]Propagation of Elastic Waves in Crystals
[edit | edit source]Relation of stress and strain in a cubic crystal
Tensor 4
[edit | edit source]Tensor 5
[edit | edit source]Conventions of Relabeling Stress, Strain, Stiffness, and Compliance in Matrix Notation
[edit | edit source]Condensation of Tensor to Matrix Notation
[edit | edit source]Strain in Terms of Stress
[edit | edit source]Stress in Terms of Strain
[edit | edit source]Tensor 6
[edit | edit source]Property Tensors
[edit | edit source]Triclinic
[edit | edit source]Monoclinic
[edit | edit source]Orthorhombic
[edit | edit source]Tetragonal
[edit | edit source]Tetragonal
[edit | edit source]Cubic
[edit | edit source]Isotropic
[edit | edit source]Cauchy Relation
[edit | edit source]- Central Forces
- Each atom at center of symmetry
- No initial stress