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Organic enantiomeric high-T c ferroelectrics

Proceedings of the National Academy of Sciences - PNAS, 2019-03, Vol.116 (13), p.5878-5885 [Peer Reviewed Journal]

ISSN: 0027-8424 ;EISSN: 1091-6490 ;DOI: 10.1073/pnas.1817866116 ;PMID: 30850531

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  • Title:
    Organic enantiomeric high-T c ferroelectrics
  • Author: Li, Peng-Fei ; Liao, Wei-Qiang ; Tang, Yuan-Yuan ; Qiao, Wencheng ; Zhao, Dewei ; Ai, Yong ; Yao, Ye-Feng ; Xiong, Ren-Gen
  • Is Part Of: Proceedings of the National Academy of Sciences - PNAS, 2019-03, Vol.116 (13), p.5878-5885
  • Description: For nearly 100 y, homochiral ferroelectrics were basically multicomponent simple organic amine salts and metal coordination compounds. Single-component homochiral organic ferroelectric crystals with high-Curie temperature (T c) phase transition were very rarely reported, although the first ferroelectric Rochelle salt discovered in 1920 is a homochiral metal coordination compound. Here, we report a pair of single-component organic enantiomorphic ferroelectrics, (R)-3-quinuclidinol and (S)-3-quinuclidinol, as well as the racemic mixture (Rac)-3-quinuclidinol. The homochiral (R)- and (S)-3-quinuclidinol crystallize in the enantiomorphic-polar point group 6 (C₆) at room temperature, showing mirror-image relationships in vibrational circular dichroism spectra and crystal structure. Both enantiomers exhibit 622F6-type ferroelectric phase transition with as high as 400 K [above that of BaTiO₃ (T c = 381 K)], showing very similar ferroelectricity and related properties, including sharp step-like dielectric anomaly from 5 to 17, high saturation polarization (7 μC/cm²), low coercive field (15 kV/cm), and identical ferroelectric domains. Their racemic mixture (Rac)-3-quinuclidinol, however, adopts a centrosymmetric point group 2/m (C 2h), undergoing a nonferroelectric high-temperature phase transition. This finding reveals the enormous benefits of homochirality in designing high-T c ferroelectrics, and sheds light on exploring homochiral ferroelectrics with great application.
  • Publisher: United States: National Academy of Sciences
  • Language: English
  • Identifier: ISSN: 0027-8424
    EISSN: 1091-6490
    DOI: 10.1073/pnas.1817866116
    PMID: 30850531
  • Source: GFMER Free Medical Journals
    PubMed Central
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