Abstract
Humidity-impedance characteristics were examined for amorphous and crystalline zirconium phosphate, their alkali salts as well as zircon samples calcined in the presence of phosphoric acid or monobasic alkali phosphates. The humidity-impedance characteristic was shown to be improved when the acidic protons of the sample were replaced with alkali cations. For calcined zircon, the impedance in a humid atmosphere was lowered when the sample was calcined with monobasic alkali phosphate as compared with the sample calcined with phosphoric acid, while the surface area hardly depended on the additives. In the case of amorphous zirconium phosphate-bases samples, replacing the acidic protons with alkali cations such as Na and K made the impedance lower and less dependent on the calcination temperature, while it decreased the surface area and the response time. Similar effects of alkali cations on impedance were also observed with crystalline zirconium phosphate.
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