Study of dielectric property and high temperature phase in Rb3H(SeO4)2

• Main Authors: Lin, Sung-he, 林松鶴
• Other Authors: Chen, Ruey-hong
• Format: Others
• Language: zh-TW
• Published: 1994
• Online Access: http://ndltd.ncl.edu.tw/handle/38327421117318568730

碩士 === 國立師範大學 === 物理研究所 === 82 === At room temperature the crystal structure of Rb3H(SeO4)2 can be classified into the monoclinic space group C2/c. When heated over the phase transition temperature, the monoclinic phase is supposed to transit into rhombohedral and superionic phase. In this experiment, we set up a heating and cooling device which can coverthe range of the supposed phase transition temperature. With the temperature device and HP4194A impedance analyzer we measure the electric conductivity,capacitance and dielectric constant of the sample at the temperature cycle between 303K and 503K. The experiment data show to us an irreversible process and an abnormal climbing at around 449K which suggests the possible phase transition temperature. In B. V. Merinov's paper discussing the conductive mechanism of the superionic phase Cs3H(SeO4)2 , difference between O(X)-O(Y) binding distances contribute the conductivity of the sample. In which, the differences are around 0.7A-1.0A. Compared to my computation on Rb3H(SeO4)2 's case, which are 0.77A-0.88A, we can predict there is a similar mechanism in Rb's case, and this experiment supports this