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This Post Has Been Edited by the Author
In Reply to: RE: It would help if your understanding of piezo phenom were clearer to the rest of us. posted by bartc on April 08, 2011 at 16:33:51
When a crystal is placed on a wall or on a pane of glass the mechanism cannot be piezoelectricity because there is no squeezing of the crystal since the force (of vibration) is in one direction only. The *squeezing* of the crystal is what produces a voltage - i.e., the piezoelectric effect. Same for when the crystals are placed on top of a CD player or top of a speaker cabinet - there is no squeezing, thus no piezoelectric effect. The mechanism I'm referring to lies in how the atoms - which are aligned in precise, symmetrical arrangements in the crystal lattice - move along their directions of motion when perturbed by an external force. It's the excitation of the atoms that is absorbing the vibration.
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