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The motions between the CFUs which form a crystalline assembly are along the directions of the joins between them. For the simple cubic crystal shown in the figure, the motions are depicted as arrows. The CFUs are represented as cubes. Each CFU belongs to three mutually perpendicular planes and moves in unison with each of the other CFUs of each of those three planes. The direction of the motion is perpendicular to the plane.
THERM links to ThermalBook.pdf an excerpt from Octahedron1sEd.pdf which describes the thrermal motion of CFUs in different crystal classes, thermal and electrical conductivity, thermal expansion of solids, the Wiedemann-Frantz relationship, thermoelectricity, kinetic theory, and specific heat.
HEAT links to a menu of files related to heat--emission, photo electric effect, electrolysis;matter and motion, fission and fusion; radiation and absorption.
OCTA links to the 500-page file Octahedron1stEd.pdf which describes the discovery that the periodicity of the Atomic Elements is octahedral. It follows that each atom is a crystalline association of identical regular octahedra and leads to the conceptual evolution briefly sketched in <Octahedron info> using the link at the top of the page.
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