The initial charge and its decay characteristics of Teflon FEP thermoelectrets have been investigated at different polarizing and storage temperatures. The decay of the electrets strongly depends on the polarizing temperature
Tnormalp
even when they are stored under the same conditions. For low polarizing temperatures, the initial charge is fairly large but it decreases as the polarizing temperature increases. After it reaches a minimum value at
Tnormalp≃100°C
, it increases again with
Tnormalp
. On the other hand, for low
Tnormalp
the residual charge which is measured 60 min after polarization, is small in spite of the fairly large initial charge and it increases with
Tnormalp
. From these experimental results, it is concluded that the polarizing temperature plays an essential role for charge stability in electrets. Observed temperature dependence of the initial charge and its decay characteristics are discussed briefly.
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