Complex impedance study of annealing effects on polycrystalline KDP conductivity |
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| Institution: | 1. Department of Inorganic and Analytical Chemistry, Faculty of Chemistry, University of Lodz, 12 Tamka St., 91-403 Lodz, Poland;2. Institute of Materials Science and Engineering, Lodz University of Technology, 1/15 Stefanowskiego St., 90-924 Lodz, Poland,;3. Department of Materials Technology and Chemistry, Faculty of Chemistry, University of Lodz, 163 Pomorska St., 90-236 Lodz, Poland |
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| Abstract: | Annealing effects on the conductivity of KDP (KH2PO4) samples prepared either by melting under slight pressure (5.7 kgf/cm2) or by powder compression (1.3 × 103kgf/cm2) were studied in air by complex impedance spectroscopy. In both cases, annealing at 423 K reduces the conductivities to constant values: from 6.2 × 10 −6 to 1.6 × 10−7 Ω−1 cm−1 for samples prepared by melting and from 1.9 × 10∼7 to 6.1 × 10∼8 Ω−1 cm−1 for samples prepared by compression. Heating KDP at about 500 K significantly modifies its electric properties. Two relaxation processes are observed after this treatment. One of them is associated with a fairly strong dielectric polarizability. A small conductivity jump is observed close to 440 K. |
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