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首页> 外文期刊>Journal of thermal analysis and calorimetry >Thermal properties, proton conductivity and vibration study of Rb2HPO4 center dot 2H(2)O
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Thermal properties, proton conductivity and vibration study of Rb2HPO4 center dot 2H(2)O

机译：Thermal properties, proton conductivity and vibration study of Rb2HPO4 center dot 2H(2)O

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摘要

Thermal properties and phase transformations of Rb2HPO4 center dot 2H(2)O have been investigated by differential scanning calorimetry and thermogravimetry and compared with ones of Cs2HPO4 center dot 2H(2)O. The absence of superionic phase transitions has been shown. Despite the isotypic structure, the thermal properties of Rb2HPO4 center dot 2H(2)O differ from those of Cs2HPO4 center dot 2H(2)O. The temperatures of the formation of dehydrated Rb2HPO4 and Rb4P2O7 salts are slightly lower than for cesium compounds. Rb2HPO4 center dot 2H(2)O was shown to decompose in two stages with the formation of Rb2HPO4 at 119 A degrees C and Rb4P2O7 at 360 A degrees C, respectively. The dehydration of Rb2HPO4 center dot 2H(2)O is characterized by non-resolved stages unlike Cs2HPO4 center dot 2H(2)O. The enthalpies of Rb2HPO4 center dot 2H(2)O dehydration and Rb2HPO4 decomposition were determined. The proton conductivity of Rb2HPO4 center dot 2H(2)O and Rb2HPO4 has been investigated by ac-impedance spectroscopy for the first time. The sharp increasing of conductivity up to 10(-2) S cm(-1) at 75-145 A degrees C was found caused by proton transport ways of crystalline hydrate water on the Rb2HPO4 grain boundaries. The proton conductivity of dehydrated Rb2HPO4 phase was shown to be quite low 10(-8) to 10(-4) S cm(-1) in the temperature range 100-250 A degrees C with the activation energy of conductivity 1.2 eV. The low conductivity values deal with the strong hydrogen bonds network which is consistent with the IR-spectroscopy data of vibration structure. The IR-spectrum at 22 A degrees C has been measured and discussed in relation to the crystal structure. IR-spectroscopy characteristics of Rb2HPO4 center dot 2H(2)O differ by strong shifts of some P-O bands of PO3(OH) tetrahedra due to the shorter interatomic distances in comparison with Cs2HPO4 center dot 2H(2)O.

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