Frequency and temperature dependence of dielectric and electrical properties of radio-frequency sputtered lead-free K0.48Na0.52NbO3 thin films
| Autor: | Hai Joon Lee, Ill Won Kim, Jin Soo Kim, Sun-Young Lee, Su Dae Lee |
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| Rok vydání: | 2010 |
| Předmět: |
Materials science
Condensed matter physics business.industry Metals and Alloys Surfaces and Interfaces Dielectric Sputter deposition Conductivity Thermal conduction Ferroelectricity Surfaces Coatings and Films Electronic Optical and Magnetic Materials Optics Electrical resistivity and conductivity Physical vapor deposition Materials Chemistry Thin film business |
| Zdroj: | Thin Solid Films. 518:6390-6393 |
| ISSN: | 0040-6090 |
| DOI: | 10.1016/j.tsf.2010.02.078 |
| Popis: | Lead-free K 0.48 Na 0.52 NbO 3 (KNN) ferroelectric thin films were prepared using the radio-frequency magnetron sputtering method. The crystallized KNN phase was confirmed using X-ray diffraction. The KNN thin film exhibited a well-saturated ferroelectric polarization-electric field hysteresis loop with high remanent polarization. The dielectric and electrical properties of the KNN thin film were investigated over a wide range of frequencies from 10 Hz to 1 MHz, and over a wide range of temperatures from 25 °C to 500 °C. The complex impedance relaxations are shown in an impedance Cole–Cole plot. With increasing temperature, the AC conductivity increased, which obeys the power law, σ ( ω ) = σ 0 + Aω s . The activation energy for the conduction process is calculated to be 0.57 eV from the slope of the AC conductivity at the low frequency. |
| Databáze: | OpenAIRE |
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