Impedance spectroscopy and dielectric analysis in KH2PO4 single crystal

R. H. Chen, Chen Chieh Yen, C. S. Shern, T. Fukami

Research output: Contribution to journalArticle

85 Citations (Scopus)

Abstract

Optical observation, differential scanning calorimetry, thermogravimetric analysis, and differential thermogravimetric measurements have been carried out on KH2PO4 single crystals. As compared with the optical observation of crystal under polarizing microscope, the dehydration process occurred gradually over the crystal surface at temperatures above 195 °C and then the interior of the sample. The ac impedance measurements were performed as a function of both frequency and temperature. The electrical conduction and dielectric relaxation have been studied. The activation energy of migration is 1.02 eV in the temperature range between 150 and 179 °C. The conduction mechanism in this temperature range is attributed to the hopping of proton among hydrogen vacancies. At temperatures above 186 °C, a higher conductivity activation energy with 2.94 eV is obtained. In addition to the proton conduction, the migration of the heavier ions (such as potassium ion) is also suggested.

Original languageEnglish
Pages (from-to)2857-2864
Number of pages8
JournalSolid State Ionics
Volume177
Issue number33-34
DOIs
Publication statusPublished - 2006 Nov 15

Keywords

  • Dielectric properties
  • Electrical conductivity
  • Impedance spectroscopy
  • KDP crystal

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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