| Autor: |
Ponomareva, V. G., Bagryantseva, I. N., Bulina, N. V., Uvarov, N. F. |
| Zdroj: |
Ionics; Oct2022, Vol. 28 Issue 10, p4667-4674, 8p |
| Abstrakt: |
The properties of high-temperature phases of Et4NHSO4 and the temperature ranges of their stability were investigated. The sequence of the reversible phase transitions at 147°C and 160°C with the enthalpies of − 3.28 J/g and − 8.99 J/g, respectively, was observed. It was shown that at 160° C the I41/acd phase with the unit cell parameters a = 14.0430(8) Å, c = 25.686(3) Å with higher degree of sulfate tetrahedra disordering was formed. This phase exists up to the melting of Et4NHSO4, 245°C. The proton conductivity of Et4NHSO4 was determined firstly and the temperature dependence varies widely from 10−8 S/cm at 90°C up to ~ 10−2 S/cm at the melting. The conductivity of the Et4NHSO4 is rather low and does not exceed 5*10−6 S/cm at temperatures below 210°C. The structural closed dimers of hydrogen-bonded sulfate anions at low temperatures hinder the effective proton transfer. Spectral characteristics of room-temperature phase also have been discussed. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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