Ferroelectric ordering in imidazolium perchlorate

The Journal of Chemical Physics
Zdzisław PająkZ Fojud

Abstract

Imidazolium perchlorate has been synthesized and studied over a wide range of temperatures by differential scanning calorimetry, x-ray diffraction, proton magnetic resonance, optical observation, and dielectric spectroscopy. Polymorphic solid-solid phase transitions have been disclosed at 487, 373, and 247 K. The crystal structure at 298 K has been determined as trigonal, space group R3m, Z=1 with a=5.484(1) A and alpha=95.18(2) degrees. The imidazolium cations are strongly disordered, while the perchlorate ions are well ordered. At 385 K the crystal structure remains trigonal, space group R3m, a=5.554(1) A and alpha=95.30(2) degrees . Both ionic sublattices are orientationally disordered. Temperature evolution of the molecular dynamics of the imidazolium cation has been characterized. In spite of a high cationic disorder, dielectric measurements have revealed the polar properties of the crystal. It appears to be a new ferroelectric compound with the Curie point at 373 K. The spontaneous polarization originates predominantly from the behavior of slightly distorted perchlorate anion.

References

Jan 1, 1994·Physical Review. B, Condensed Matter·P CzarneckiJ Wasicki

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Citations

Dec 20, 2012·Nature Communications·Sachio HoriuchiYoshinori Tokura
Mar 23, 2012·Acta Crystallographica. Section B, Structural Science·Hanna MałuszyńskaZdzisław Pająk
Apr 7, 2016·Chemical Society Reviews·Ping-Ping ShiRen-Gen Xiong
Nov 11, 2009·Chemistry : a European Journal·David B CordesRobin D Rogers
Jun 3, 2017·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Tamara J BednarchukMarek Wołcyrz
Oct 6, 2020·Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials·Daria BudzikurKatarzyna A Ślepokura
Oct 1, 2021·Nature Communications·Yong HuShenqiang Ren

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