High Temperature Dielectric Anomaly of Ammonium Sulfate ((NH4)2SO4) Crystal.

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  • Kim Yong–Hae
    Department of Physics, Korea Advanced Institute of Science and Technology, 373–1 Kusung–dong, Yusung–ku, Taejon 305–701, Korea
  • Kim Bog–Gi
    Department of Physics, Korea Advanced Institute of Science and Technology, 373–1 Kusung–dong, Yusung–ku, Taejon 305–701, Korea
  • Kim Jong–Jean
    Department of Physics, Korea Advanced Institute of Science and Technology, 373–1 Kusung–dong, Yusung–ku, Taejon 305–701, Korea

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  • High Temperature Dielectric Anomaly of
  • High Temperature Dielectric Anomaly of Ammonium Sulfate [(NH<sub><b>4</b></sub>)<sub><b>2</b></sub>SO<sub><b>4</b></sub>] Crystal

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Dielectric anomalies were observed in ammonium sulfate [(NH4)2SO4] crystals at T0≅ 413K after the crystal was heated above 413K. Frequency dependence of dielectric loss across T0≅ 413K observed in the 2nd heating-up cycle could be best fitted by two overlapping relaxation functions of the Cole-Cole type. The fast component in higher frequency region depicts a sharp discontinuity of relaxation frequency at T0≅ 413K while the slow component in lower frequency region shows a continuous slowing down to zero relaxation frequency as temperature increased to T0≅ 413K.

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