Bulletin of the Korean Chemical Society

  • 제22권11호
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  • Pages.1231-1235
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  • 2001
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  • 0253-2964(pISSN)
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  • 1229-5949(eISSN)
대한화학회 (Korean Chemical Society)
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Preparation of Pseudotetragonal $ZrO_{0.75}S$ and Its Electric Responses on Temperature and Frequency Related to Microstructural Relaxation

  • 발행 : 20011100
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초록

Pseudotetragonal ZrO0.75S whose space group is P212121 was synthesized and the cell dimensions were a=5.110(2) $\AA$, b=5.110(7) $\AA$, and c=5.198(8) $\AA.$ The space group P212121 seems to be resulted from lowering the symmetry of cubic ZrOS structure with P213 space group by lattice distortion due to the oxygen defects. In the distorted structure, bond shortening between metal-nonmetal by reduction of cell volume and alternation of Zr-Zr distance were observed. Dielectric constant and loss data of the bulk material in temperature range -170 to 20 $^{\circ}C$ and frequency range 50 Hz to 1 MHz showed that there was dielectric transition at around -70 $^{\circ}C$ originated from the relaxation of Zr-S segment. Comparing with ZrO2 exhibited the dielectirc constants, 9.0 at room temperature, ZrO0.75S showed high dielectric constant, k = 200.2 at 100 kHz. The activation energy of relaxation time due to dielectric relaxation of Zr-S was 0.47 eV (11.3 kcal/mole). According to the impedance spectra, ZrO0.75S showed more parallel circuit character between the resistance and capacitance components at the temperature (-70 $^{\circ}C)$ that the Zr-S dielectric relaxation was observed.

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참고문헌

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피인용 문헌

  1. Zirconium Titanate Thin FIlm Prepared by Surface Sol-Gel Process and Effects of Thickness on Dielectric Property vol.23, pp.5, 2001, https://doi.org/10.5012/bkcs.2002.23.5.741
  2. Effect of sulfur impurity on the stability of cubic zirconia and its interfaces with metals vol.21, pp.33, 2001, https://doi.org/10.1039/c1jm10908a