Electrical properties of a new mixed cesium–ammonium dihydrogen phosphate–arsenate: Cs0.55(NH4)0.45H2(PO4)0.39(AsO4)0.61
| Autor: | K. Jaouadi, Nabil Zouari, Tahar Mhiri, Samia Chouchene, Abdelaziz Daoud |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
Phase transition Condensed matter physics Chemistry General Chemical Engineering General Engineering Analytical chemistry General Physics and Astronomy 02 engineering and technology Dielectric Atmospheric temperature range Conductivity 021001 nanoscience & nanotechnology 01 natural sciences Ammonium dihydrogen phosphate chemistry.chemical_compound Phase (matter) 0103 physical sciences General Materials Science 0210 nano-technology Spectroscopy Solid solution |
| Zdroj: | Ionics. 23:169-176 |
| ISSN: | 1862-0760 0947-7047 |
| DOI: | 10.1007/s11581-016-1798-7 |
| Popis: | Partial substitution of P by As and of Cs by NH4, leading to the solid solution Cs1-x(NH4)xH2(PO4) y (AsO4)1-y, with x = 0.45 and y = 0.39 (abbreviated as CADPA) has been shown. Two phase transitions at T 1 = 204 K and T 2 = 407 K were detected and studied by dielectric measurements and impedance and modulus spectroscopy. The evolution of the dielectric constant as a function of frequency and temperature revealed that the first transition (204 K) to be first order and antiferroelectric–paraelectric. The high-temperature phase transition (407 K) leads to a superionic protonic phase, characterized by an unusual high conductivity. The conductivity relaxation parameters associated with the high-disorder protonic conduction have been determined from analysis of the M″/M″ max spectrum measured in a wide temperature range. Transport properties in this material appear to be due to proton hopping mechanism. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink