Hill, Van Santen, Steadman & Simpson
Method for the preparation of a pyroelectric material
 When a polycrystal or pyroelectric crystal material is manufactured by deposition of pyroelectric crystal particles in a layer, a temperature change or gradient is applied to pyroelectric binding particles which are dispersed between a pair of opposing electrodes (13, 14), before said particles are deposited on one (13) of the electrodes, for forming a layer of pyroelectric binding particles on the electrode (13) with the pyroelectrical axes of the particles oriented in advance of deposition thereof. Such temperature change or gradient may be produced by vaporization of a liquid dispersion (12) of the pyroelectric binding articles near its surface with resultant cooling of the electrode (13) and in the near-by zone in such a manner that the liquid temperature is decreased as the crystal particles approach the electrode (13). As a result, apparent electrical dipoles are produced in the pyroelectric crystal particles, whereby the pyroelectrical axes are oriented in the same direction and polarity before the particles are affixed to the electrode (13). 
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