Electrical properties of a new mixed cesium–ammonium dihydrogen phosphate–arsenate: Cs_0.55(NH₄)_0.45H₂(PO₄)_0.39(AsO₄) _{详细信息    查看全文}

• 作者：Samia Chouchene ; Khaled Jaouadi ; Tahar Mhiri ; Nabil Zouari ; Abdelaziz Daoud
• 关键词：Inorganic materials ; Cs0.55(NH4)0.45H2(PO4)0.39(AsO4)0.61 ; Antiferroelectric–paraelectric phase transition ; Superprotonic phase transition ; Proton hopping mechanism
• 刊名：Ionics
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：23
• 期：1
• 页码：169-176
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Electrochemistry; Renewable and Green Energy; Optical and Electronic Materials; Condensed Matter Physics; Energy Storage;
• 出版者：Springer Berlin Heidelberg
• ISSN：1862-0760
• 卷排序：23

文摘

Partial substitution of P by As and of Cs by NH₄, leading to the solid solution Cs_1-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 T₁ = 204 K and T₂ = 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.