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6.7: Neumann's Principle

Last updated

Jul 1, 2023
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- 6.6: Metric tensor
- 6.8: Piezoelectricity

Online Dictionary of Crystallography
International Union of Crystallography

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Neumann's principle, or principle of symmetry, states that, if a crystal is invariant with respect to certain symmetry elements, any of its physical properties must also be invariant with respect to the same symmetry elements, or otherwise stated, the symmetry elements of any physical property of a crystal must include the symmetry elements of the point group of the crystal. It is generalized to physical phenomena by Curie laws.

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