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Registered Member #350
Joined: Mon Mar 27 2006, 05:14PM
Location:
Posts: 106
Damn. I fear those suckers might actually be multi layered which would seriously limit their usability for high voltage generation. They have a capacity of more then 1nF which means they either have a dielectric constant of 100,000 or they have to be multilayered i.e. several thin crystals stacked together and connected in parallel. After looking at various websites it seems that piezoelectric ceramics usually have dielectric constants between 100 and 5000 which means those crystals consist of 5 to 30 layers. I guess they were meant to be used in actuators. Can someone who already has some of these piezos confirm that?
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
How would you connect the layers in parallel without having A) isolating barries between the layers and B) having some kind of wires or other connectors actually connecting them in parallel? I think it should be very obvious if this was the case.
You are definitely right about the dielectric constant being huge at a capacity of 1nF (has this been confirmed?).
Madgyver, if you feel like sacrifising on of the crystals, you could just heat it up with a torch and see if it falls apart into layers. Or you could smash one, and see if you get layer-y bits :)
Registered Member #75
Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711
Wow, that is the best quote ever! I have to put that in my signature.
Actually I dont think it would be that bad: The piezo is only 1cm tall, so it will arc over at less than 10kV and short circuit any harmfull voltage. The energy it can put out will probably be no more than a fraction of a joule, so I dont think it could be dangerous from that point of view either.
Registered Member #89
Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145
Poor smashed piezo... Piezo-elements are usually not layered except for some really special purpose. With hard kick you can get maybe few tens of kV; iimpac doesnt need to be really strong but fast (see the mehanism in cigarette lighter).
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Experiments with piezos
