Low-Temperature Characterization of Domain Wall Dynamics and Electrical Conduction in a Proton-Irradiated K(H$_{0.21}$D$_{0.79}$)$_2$PO$_4$ System
Low-Temperature Characterization of Domain Wall Dynamics and Electrical Conduction in a Proton-Irradiated K(H$_{0.21}$D$_{0.79}$)$_2$PO$_4$ System
- 주제(키워드) Radiation damage , Impedance spectroscopy , Dielectric properties , Defects , Ionic conductivity
- 발행기관 한국물리학회
- 발행년도 2017
- 총서유형 Journal
- UCI G704-000378.2017.67.2.019
- KCI ID ART002198726
- 본문언어 영어
초록/요약
We investigated the longitudinal electrical conductivity associated with the domain-wall dynamics in proton-irradiated K(H$_{0.21}$D$_{0.79}$)$_2$PO$_4$ single crystals a temperatures below room temperature. Frequency-dependent longitudinal dielectric-loss measurements allowed us to investigate the changes in the domain-wall dynamics of the proton-irradiated crystal with a ferroelectric phase-transition temperature increase of 8 K. Using the Vogel-Fulcher function, we found that proton irradiation produced a slight increase in the activation energy of domain freezing. The temperature dependence of the power-law exponent $n$ in frequency-dependent electrical conductivity in proton-conducting systems decreased at temperatures near the phase-transition temperature $T_{c2}$. In addition, the temperature dependence of the electrical conductivity shifted to higher temperatures because of the increased phase-transition temperature arising from the proton irradiation.
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