Impedance spectroscopy and dielectric analysis in KH2PO4 single crystal

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

doi:10.1016/j.ssi.2006.05.053

Impedance spectroscopy and dielectric analysis in KH₂PO₄ single crystal

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

^*Corresponding author for this work

Department of Physics

Research output: Contribution to journal › Article › peer-review

102 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 language	English
Pages (from-to)	2857-2864
Number of pages	8
Journal	Solid State Ionics
Volume	177
Issue number	33-34
DOIs	https://doi.org/10.1016/j.ssi.2006.05.053
Publication status	Published - 2006 Nov 15

Keywords

Dielectric properties
Electrical conductivity
Impedance spectroscopy
KDP crystal

ASJC Scopus subject areas

General Chemistry
General Materials Science
Condensed Matter Physics

Access to Document

10.1016/j.ssi.2006.05.053

Cite this

@article{02790e8976d1482283cb83c2e605da54,

title = "Impedance spectroscopy and dielectric analysis in KH2PO4 single crystal",

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.",

keywords = "Dielectric properties, Electrical conductivity, Impedance spectroscopy, KDP crystal",

author = "Chen, {R. H.} and Yen, {Chen Chieh} and Shern, {C. S.} and T. Fukami",

note = "Funding Information: This work was supported by the National Science Council of ROC (Project No. NSC93-2112-M-003-013 and NSC94-2112-M-003-009). ",

year = "2006",

month = nov,

day = "15",

doi = "10.1016/j.ssi.2006.05.053",

language = "English",

volume = "177",

pages = "2857--2864",

journal = "Solid State Ionics",

issn = "0167-2738",

publisher = "Elsevier BV",

number = "33-34",

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TY - JOUR

T1 - Impedance spectroscopy and dielectric analysis in KH2PO4 single crystal

AU - Chen, R. H.

AU - Yen, Chen Chieh

AU - Shern, C. S.

AU - Fukami, T.

N1 - Funding Information: This work was supported by the National Science Council of ROC (Project No. NSC93-2112-M-003-013 and NSC94-2112-M-003-009).

PY - 2006/11/15

Y1 - 2006/11/15

N2 - 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.

AB - 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.

KW - Dielectric properties

KW - Electrical conductivity

KW - Impedance spectroscopy

KW - KDP crystal

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