کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5150534 | 1498237 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impedance spectroscopy studies of proton conductivity in imidazolium malonate
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
الکتروشیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Imidazolium malonate ɱstands out from other proton conducting compounds of nitrogen containing heterocyclic bases with dicarboxylic acids due to a presence of both ordered and disordered imidazolium in the crystal lattice. Our impedance spectroscopy studies of electric conductivity revealed that in the range 273 K â¤Â T â¤Â 318 K the dc conductivity is characterized by an activation energy of Ea1 = 0.50 eV and the activation energy decreases to Ea2 = 0.17 eV at temperatures 318 K â¤Â T â¤Â 358 K. Single crystal X-ray diffraction studies showed that imidazolium malonate has the same triclinic structure with P-1 space group and rather high thermal displacements factors at 280 K as well as at 340 K. The results suggest that the low-temperature activation energy can be ascribed to phonon assisted 180° flipping of ordered imidazolium cations, observed earlier in NMR experiments. The 'fast-like diffusion' of protons in the high temperature range we consider to be due to the presence of disordered imidazolium cations enhanced by high thermal displacements.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Solid State Ionics - Volume 306, August 2017, Pages 25-30
Journal: Solid State Ionics - Volume 306, August 2017, Pages 25-30
نویسندگان
PaweÅ Åawniczak, Katarzyna Pogorzelec-Glaser, Adam Pietraszko, Bożena Hilczer,