Piezoelectric Effect: Length Contraction & Dipole Moment

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SUMMARY

The discussion centers on the Piezoelectric effect, specifically its relationship with dipole moment and length contraction in crystals. It is established that the Piezoelectric effect arises from the alignment of spontaneous dipoles, which many crystals, such as rocksalt, lack. The conversation highlights that even when a crystal is accelerated, an outside observer would still measure a net dipole of zero if the crystal does not possess spontaneous dipoles. This reinforces the understanding that the Piezoelectric effect is not simply a result of external forces but requires specific internal structural characteristics.

PREREQUISITES
  • Understanding of the Piezoelectric effect
  • Knowledge of dipole moments in materials
  • Familiarity with crystal structures and their properties
  • Basic principles of special relativity, particularly length contraction
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  • Research the alignment of spontaneous dipoles in various crystals
  • Study the principles of special relativity and their implications on physical properties
  • Explore the applications of the Piezoelectric effect in technology
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Physicists, materials scientists, and engineers interested in the properties of crystals and the applications of the Piezoelectric effect in various technologies.

KingBigness
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From what I understand the Piezoelectric effect occurs when there is a change in dipole moment. If a crystal was to be accelerated along the x direction then the crystal will undergo a length contraction. My question is, would this not cause a change in dipole moment from an outside observer and hence create an effect analogousness to the piezoelectric effect?
 
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I think your understanding of piezoelectric is not accurate. Piezoelectric is caused by an alignment of spontaneous dipoles. Most crystals have not spontaneous dipoles. For example, if you squeeze rocksalt, the net dipole in the material is still zero. Check out wikipedia for getting a basic understanding.
 
Supposing we did have such a crystal and it was wired to a sensitive voltmeter. We could ask a inertially passing lab to look at the voltmeter readout as they fly by. Obviously everyone sees the same reading - zero.
 

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