New Ferroelastic-Ferroelectric Compound: Tanane

Bordeaux, D.; Bornarel, Jean; Capiomont, A.; Lajzérowicz-Bonneteau, J.; Lajzérowicz, J.; Legrand, J.F.

doi:10.1103/physrevlett.31.314

Cited by 72 publications

(35 citation statements)

References 5 publications

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“…This feature is quite promising for finding new paradigms with various structure–property relationships, for instance, such as crystal symmetry and dimensionality. Polarity switching over two dimensions as seen for MBI is significantly advantageous for improving the polarization performance of the randomly orientated polycrystalline state, such as the thin-film form, compared with the uniaxial polarity available in other organic ferroelectrics except TEMPO24 (tanane). An improved crystal symmetry also permits the formation of non-180° domains (that is, the 90° domain for MBI), which have often been utilized as high-performance ferroelectric or piezoelectric properties in ferroelectric oxides.…”

Section: Discussionmentioning

confidence: 99%

Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles

et al. 2012

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The imidazole unit is chemically stable and ubiquitous in biological systems; its proton donor and acceptor moieties easily bind molecules into a dipolar chain. Here we demonstrate that chains of these amphoteric molecules can often be bistable in electric polarity and electrically switchable, even in the crystalline state, through proton tautomerization. Polarization–electric field (P–E) hysteresis experiments reveal a high electric polarization ranging from 5 to 10 μC cm−2 at room temperature. Of these molecules, 2-methylbenzimidazole allows ferroelectric switching in two dimensions due to its pseudo-tetragonal crystal symmetry. The ferroelectricity is also thermally robust up to 400 K, as is that of 5,6-dichloro-2-methylbenzimidazole (up to ~373 K). In contrast, three other benzimidazoles exhibit double P–E hysteresis curves characteristic of antiferroelectricity. The diversity of imidazole substituents is likely to stimulate a systematic exploration of various structure–property relationships and domain engineering in the quest for lead- and rare-metal-free ferroelectric devices.

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Section: Discussionmentioning

confidence: 99%

Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles

et al. 2012

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“…or At lower temperature, as q increases, the ratio u/ r¡ is also expected to increase and we get for the completely ordered system (I q I = 1) : or These last values appear to be much overestimated in comparison with the spontaneous shear strain measured at low temperature [1] :…”

Section: Fig 2 -Schematic Diagram Showing the Four Differentmentioning

confidence: 75%

“…This analysis also reveals an important biquadratic coupling term which is supposed to enhance the instability of the structure in the vicinity of Tc. 1. Introduction.…”

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Ferroelastic and ferroelectric phase transition in a molecular crystal : tanane - 3. — From ab initio computation of the intermolecular forces to statistical mechanics of the transition

Legrand

Lajzérowicz

Lajzérowicz-Bonneteau

et al. 1982

J. Phys. France

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“…The permanent dipoles of polar molecules generate an electric polarization in most conventional single-component low-molecular-weight compounds such as thiourea 10 and (2,2,6,6-tetramethylpiperidine 1-oxyl) (TEMPO), 11 as well as in polymer ferroelectrics 12 and vinylidene fluoride (VDF) oligomers. 13 In contrast, the ferroelectricity of many ferroelectric oxides arises from the relative displacement of ions, which often results in low-field polarization reversal and a high dielectric response.…”

Section: Introductionmentioning

confidence: 99%

Ionic versus Electronic Ferroelectricity in Donor–Acceptor Molecular Sequences

et al. 2013

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Molecular displacement in an alternating chain of donors and acceptors triggers ferroelectric switching of large electric polarization with a low electric field in some charge-transfer complexes. While the displacement of a point charge (i.e., static charge) provides a good picture of the polarization for spinPeierls-type transition in an ionic complex of tetrathiafulvalene (TTF) and p-bromanil (BA), it completely fails to explain both the magnitude and direction of the observed spontaneous polarization in the neutral-ionic transition of TTFp-chloranil (CA). The most spectacular behavior is that the TTF cations are displaced toward the anode and the CA anions toward the cathode. Recent experimental and theoretical research has highlighted the strong effects of dynamic electrons traveling in the intermolecular space of TTFCA. The new "electronic ferroelectricity" mechanism can also be envisioned as a powerful guide for guaranteeing high-performance dielectric and related electronic functionalities, especially for organic molecular systems.

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New Ferroelastic-Ferroelectric Compound: Tanane

Cited by 72 publications

References 5 publications

Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles

Above-room-temperature ferroelectricity and antiferroelectricity in benzimidazoles

Ferroelastic and ferroelectric phase transition in a molecular crystal : tanane - 3. — From ab initio computation of the intermolecular forces to statistical mechanics of the transition

Ionic versus Electronic Ferroelectricity in Donor–Acceptor Molecular Sequences

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