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After a few days, I cannot find an answer to this question:

Besides mechanical stress, is there another way to induce a negative charged surface on quartz?

Note: several scholarly articles kept referring to photons/light but never gave an example or explanation. This is one example of not finding adequate material. Of course, I found other discussions which usually went into silicon and semiconductors. Not what I am looking for.

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  • $\begingroup$ I think your question would be better suited for the physics stack exchange. At EESE, we talk more so about the design of electronic devices. $\endgroup$
    – Funkyguy
    Dec 31 '14 at 8:44
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According to the triboelectric series, rub a Teflon rod with a piece of silk, then separate them and touch the rod to the surface of the quartz, and some charge will be transferred to the quartz surface.

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Besides mechanical stress, one way to induce a voltage across a quartz-crystal is a change in temperature, since quartz is also a pyroelectrica. The crystal structure changes in response to a different temperature, and induces polarization.

This is not always the case for piezoelectrica, since not all piezoelectrica are pyroelectrica:

Relationship between pyro, piezo and ferroelctrica.

The generated voltage will gradually disappear due to leakage current.

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