Ionic dynamics in the rotator phase of n-alkylammonium chlorides (C₆–C₁₀), studied by¹H nuclear magnetic resonance, electrical conductivity and thermal measurements

Conduction in ionic organic plastic crystals: The role of defects

“…This indicates that defects big enough to accommodate a cation and an anion are required for conduction, and that the rates of cation and anion diffusion are correlated. The correlation between the cation and anion diffusions has also been observed in many ammonium plastic crystals through NMR [17,25,26]. A possible explanation is a Schottky mechanism in phase III in which an ion hopping into a vacancy causes a counter-charged ion to hop into a vacancy in the vicinity to maintain local charge neutrality.…”

Phase Behavior of the [N(C₂H₅)₄][BF₄]-[N(C₃H₇)₄][BF₄] Binary System

“…24 Alkylammonium salts have been attracting attention in structural studies because they exhibit a variety of structural changes during thermal transitions and their highest temperature solid phase is often characterized as IPC phase. [25][26][27] Our previous study on plastic crystal phases of tetraalkylammonium salts of BF 4 ¹ and PF 6 ¹ showed that the size of the ions affects the structural type of their plastic crystal phases, which follows the radius ratio rule. 28 The NaCl-type structure was confirmed by indexing powder X-ray diffraction patterns for the plastic crystal phase of some salts with small cations such as N 2222 + (tetraethylammonium, see Fig.…”

Thermal analysis, nuclear magnetic resonance spectroscopy, and impedance spectroscopy of N,N-dimethyl-pyrrolidinium iodide: An ionic solid exhibiting rotator phases

“…4,5 Other organic-based materials with multiple phase transitions and rotator phases include families of quaternary-ammonium cations, imidazolium cations, and pyrrolidinium cations. [6][7][8][9][10][11] The salts based on the N-alkyl-N-methyl-pyrrolidinium cations ͑Fig. 1͒ have been extensively explored in terms of phase behavior, conductivity, etc.…”