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Impedance spectroscopy studies of K_2SO_4 in the intermediate temperature regime

机译：中间温度下K_2SO_4的阻抗谱研究

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Impedance spectroscopy measurements of K_2SO_4 have been carried out from 5 Hz to 13 MHz over the temperature range 403-782℃. The plots of corrected imaginary part of permittivity, ε″, and its real part ε′ vs. frequency clearly show a new dielectric relaxation around f_(max) = 1.4 x 10~4 Hz at 403℃, which shifts to higher frequencies (～ 1 MHz) as the temperatures increases. The f_(max) (calculated from the peak position of ε″) vs. reciprocal T shows an activated relaxation process over the temperature range 403-600℃ with activation energy E_a = 1.02 eV, which is close to that derived from the dc-conductivity, E_σ = 1.15 eV. We suggest that the observed dielectric relaxation could be produced by the K~+ jump and SO_4~- reorientation that cause distortion and change the local lattice polarizability inducing dipoles like KSO4.
机译：K_2SO_4的阻抗谱测量在403-782℃的温度范围内从5 Hz到13 MHz。校正后的介电常数虚部ε”及其实部ε′与频率的关系图清楚地表明，在403℃下，f_（max）= 1.4 x 10〜4 Hz附近出现了新的介电弛豫，并向更高的频率偏移（〜 1 MHz）随着温度升高。 f_（max）（由ε''的峰值位置计算）与倒数T的关系表明，在403-600℃的温度范围内，激活弛豫过程的激活能量E_a = 1.02 eV，与从dc-电导率E_σ= 1.15 eV。我们认为，观察到的介电弛豫可能是由K +跃迁和SO_4〜-重取向引起的，它们引起畸变并改变了像KSO4一样引起局部晶格极化性的偶极子。

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