| Summary: | 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
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