Pyroelectric enthalpimetric detection

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Abstract
A pyroelectric enthalpimetric calorimeter for the H-O reaction was constructed using Pd and Au electrodes on a 2.5-cm-diam, 0.3-mm-thick LiTaO3 wafer. The counter (or common) electrode was of Au. The detector was placed in a chamber and various gases were admitted at pressures slightly above atmospheric. 100 ppm H2 in N2 was used as the hydrogen source and pure O2 as the oxygen source. A thermal signature was obtained on the Pd electrode that was confirmed by a thermocouple attached to the pyroelectric calorimeter. A delayed thermal signature was observed on the Au electrode resulting from thermal diffusion in the LiTaO3 substrate of the heat generated at the Pd electrode. The results on the H-O reaction are in general agreement with the literature on Pd metal oxide semiconductor (MOS) structures. The results demonstrate the utility of the pyroelectric calorimeter.

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