Optical activity of ferroelectric dicalcium strontium propionate

Kobayashi, J.; Bouillot, J.; Kinoshita, Kodai

doi:10.1002/pssb.2220470227

Cited by 48 publications

(4 citation statements)

References 13 publications

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“…In the FP, the inconsistence of the rotatory direction of the crystal with that of the molecule indicates that the contribution from the helical packing in the point group 4 is opposite to that from the molecule, and the former is greater. Probably, the polarization of the crystal (see below) plays an important role in the optical rotation, as observed in other ferroelectrics 4 5 6 7 8 9 10 . In the PP, the observed weak left-handed rotation indicates that the optical activity is mainly contributed by the molecules, while the contribution from the spatial arrangement is negligible.…”

Section: Resultsmentioning

confidence: 87%

“…As polar materials, ferroelectrics should crystallize in the ten polar point groups ( C 1 , C 2 , C s , C 2 v , C 4 , C 4 v , C 3 , C 3 v , C 6 , C 6 v ), seven of which, including five enantiomorphic groups ( C 1 , C 2 , C 4 , C 3 , C 6 ,) and two non-enantiomorphic groups ( C s , C 2 v ), are optically active3. Because ferroelectric phase transitions and ferroelectric polarization reversal are accompanied by the change of the chirality of the crystals in many cases, ferroelectric optical activity is of importance for practical applications and the understanding of phase transition mechanisms45678910.…”

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confidence: 99%

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Anomalously rotary polarization discovered in homochiral organic ferroelectrics

et al. 2016

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Molecular ferroelectrics are currently an active research topic in the field of ferroelectric materials. As complements or alternatives of conventional inorganic ferroelectrics, they have been designed to realize various novel properties, ranging from multiferroicity and semiconductive ferroelectricity to ferroelectric photovoltaics and ferroelectric luminescence. The stabilizing of ferroelectricity in various systems is owing to the flexible tailorability of the organic components. Here we describe the construction of optically active molecular ferroelectrics by introducing homochiral molecules as polar groups. We find that the ferroelectricity in (R)-(−)-3-hydroxlyquinuclidinium halides is due to the alignment of the homochiral molecules. We observe that both the specific optical rotation and rotatory direction change upon paraelectric-ferroelectric phase transitions, due to the existence of two origins from the molecular chirality and spatial arrangement, whose contributions vary upon the transitions. The optical rotation switching effect may find applications in electro-optical elements.

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Section: Resultsmentioning

confidence: 87%

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confidence: 99%

Anomalously rotary polarization discovered in homochiral organic ferroelectrics

et al. 2016

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“…Effective methods to determine whether any ferroelectric crystal be proper or improper would be accurate measurements of the dielectric constants and lattice anisotropies. The latter properties contain not only lattice strains and optical birefringence but also optical activity [17]. The accurate measurement of &" in the wide temperature range is important and effective in that it provides the true electrostrictive constant and To, and accordingly gives us important information on the strength of the coupling.…”

Section: Discussionmentioning

confidence: 99%

A phenomenological theory of dielectric and mechanical properties of improper ferroelectric crystals

Kobayashi

Enomóto

Sato

1972

Physica Status Solidi (b)

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101

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A phenomenological theory has been developed for explaining the anomalous dielectric and electro-mechanical properties of some improper ferroelectrics. An ordering parameter 8, which plays the role of a trigger for the onset of the spontaneous polarization P is introduced into the thermodynamical potential function. The peculiar dielectric properties of (NH4)2S04-and Gd,(MoO,),-group crystals and the anomalous behaviour of the lattice strains of Fe-I-boracite can be well explained on the basis of this theory. A graphical investigation in a proper 8-P plane shows how the strength of the coupling between 8 and P characterizes the transition mechanisms of the improper ferroelectrics. As a result, it has become clear that the common origin of the peculiar physical properties of both crystal groups lies in the extreme weakness of the couplings. Experimental methods to disclose improper ferroelectric mechanisms are discussed.Eine ph%nomenologische Theorie wurde entwickelt, die die anomalen dielektrischen und elektromechanischen Eigenschaften einiger nichtidealer Ferroelektrika erklart. Ein Ordnungsparameter 8, der die Rolle eines Triggers fur den Einsatz der spontanen Polarisation P spielt, wird in die thermodynamische Potentialfunktion eingefuhrt. Die eigenartigen dielektrischen Eigenschaften von (NH,),SO,-und G$(Mo04)s-Kristallen und das anomale Verhalten der Gitterdeformation der Fe-I-Borazite lassen sich auf der Grundlage dieser Theorie gut erklaren. Eine graphische Untersuchung in einer geeigneten 8-PEbene zeigt, wie die Kopplungsstarke zwischen 8 und P die Ubergangsmechanismen nichtidealer Ferroelektrika charakterisiert. Als Ergebnis wird klar, daO der gemeinsame Ursprung der besonderen physikalischen Eigenschaften der beiden Kristallgruppen in der extrem geringen Kopplung liegt. Es werden experimentelle Methoden zur Aufdeckung der Mechanismen nichtidealer Ferroelektrika diskutiert.

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“…optical birefringence and activity (gyration), is one of the most important clues for studying physical properties of a crystal. In order to investigate a phase transition between two states of a crystal, the behavior of birefringence is useful for the phenomenological approach to ,: the transition mechanism (Kobayashi, Bouillot & Kinoshita, 1971). It must be stressed that the importance of the optical activity as a peculiar quantity, which can sensibly respond to the modulation of the crystal lattice and to the change of the bonding nature of constituent atoms, has become appreciated in the last few years.…”

Section: Introductionmentioning

confidence: 99%

A new optical method and apparatus `HAUP' for measuring simultaneously optical activity and birefringence of crystals. I. Principles and construction

Kobayashi¹,

Uesu²

1983

J Appl Cryst

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224

130

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A new and accurate method has been developed by which all the components of the anisotropy of the optical susceptibilities can be determined. The apparatus based on this method has been constructed, and named as HAUP (High-Accuracy Universal Polarimeter). The basic principle is to measure the intensity of the light beam, which is propagated successively through a polarizer, a specimen, and an analyser, as functions of azimuth and deflecting angle from the crossed-Nicols condition. Thus the method is characterized by its extreme simplicity, which prevents systematic errors. Considerations and tests of inevitable systematic errors are made. The systematic errors originating in the parasitic ellipticities of the polarizer and analyser are found to be serious for the measurements of optical activity; appropriate solutions to remove them are devised here. Sensitivities of measurements of optical activity and birefringence by the HAUP method reach 4.8 × 10 -8 and 2.2 × 10 -6 respectively, the accuracy being 4.2 × 10-3 and 2.2 × 10 -3 respectively. By using HAUP it has become possible to measure simultaneously all the components of optical activity, birefringence and rotation of optical indicatrix of any crystals, including those belonging to the monoclinic and triclinic systems. These measurements can be made from about 400 K down to 10 K. Also, simultaneous determinations of electrogyration and electrooptic coefficients have become feasible by applying electric fields to crystals.

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Optical activity of ferroelectric dicalcium strontium propionate

Cited by 48 publications

References 13 publications

Anomalously rotary polarization discovered in homochiral organic ferroelectrics

Anomalously rotary polarization discovered in homochiral organic ferroelectrics

A phenomenological theory of dielectric and mechanical properties of improper ferroelectric crystals

A new optical method and apparatus `HAUP' for measuring simultaneously optical activity and birefringence of crystals. I. Principles and construction

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