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@@ When a temperature change under a vacuum condition is applied to a pyroelectriccrystal such as lithium tantarate (LiTa03) and lithium niobate (LiNb03)，anelectric field is produced due to uncompensated charges on the surface of thepyroelectric crystal．As a result．quite small amounts of suspended electrons and ionsin the condition are accelerated by the electric field．In the present study，applying thisproperty．