Dielectric evidence of a first-order transition in KH2PO4

Okada, Kenkichi; Sugie, H.

doi:10.1016/0375-9601(71)90697-9

“…The existence of this ferroelectric critical point E cr Y T cr in the electric field ± temperature EÀT phase diagram was predicted by Ginzburg [20,21] and Devonshire [13,25,26] using the Landau mean-field theory of phase transitions. The shift of T c with the electric field and the presence of a critical point have been clearly demonstrated in BaTiO 3 [77] and KDP (KH 2 PO 4 ) [78,79], both proper ferroelectrics with first-order phase transitions, and also in a ferroelectric liquid crystal [30], a first-order improper ferroelectric in which the order parameter is the molecular tilt, not electric polarization.…”

Section: March 2000 Two-dimensional Ferroelectricsmentioning

confidence: 99%

“…Table 1 gives values of dT c adE, E cr , T cr for P(VDF ± TrFE 70 X 30) as well as for BaTiO 3 , KDP, and a ferroelectric liquid crystal. Ferroelectric polymers have a relatively large range of field-induced phase transition temperatures T cr À T co 65 AE 11 C as compared to other ferroelectric materials like BaTiO 3 [14,77], KDP [78,79], and ferroelectric liquid crystals [30] because of the relatively weak van der Waals interaction in the polymers [41]. The piezoelectric and pyroelectric effects are well established in PVDF [52,80] and its copolymers.…”

Section: March 2000 Two-dimensional Ferroelectricsmentioning

confidence: 99%

See 1 more Smart Citation

Two-dimensional ferroelectrics

Blinov¹,

Fridkin²,

Palto³

et al. 2000

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Blinov, L. M.; Fridkin, V. M.; Palto, S.P.; Bune, A. V.; Dowben, Peter A.; and Ducharme, Stephen, "Two-Dimensional Ferroelectrics" (2000). Abstract. The investigation of the finite-size effect in ferroelectric crystals and films has been limited by the experimental conditions. The smallest demonstrated ferroelectric crystals had a diameter of $ 200 A and the thinnest ferroelectric films were $ 200 A thick, macroscopic sizes on an atomic scale. Langmuir ± Blodgett deposition of films one monolayer at a time has produced high quality ferroelectric films as thin as 10 A, made from polyvinylidene fluoride and its copolymers. These ultrathin films permitted the ultimate investigation of finite-size effects on the atomic thickness scale. Langmuir ± Blodgett films also revealed the fundamental two-dimensional character of ferroelectricity in these materials by demonstrating that there is no so-called critical thickness; films as thin as two monolayers (1 nm) are ferroelectric, with a transition temperature near that of the bulk material. The films exhibit all the main properties of ferroelectricity with a first-order ferroelectric ± paraelectric phase transition: polarization hysteresis (switching); the jump in spontaneous polarization at the phase transition temperature; thermal hysteresis in the polarization; the increase in the transition temperature with applied field; double hysteresis above the phase transition temperature; and the existence of the ferroelectric critical point. The films also exhibit a new phase transition associated with the twodimensional layers.

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“…12Ã) ÏÑÐÑÔÎÑÇÄ [71]. ¿ÕÑ ÅËÔÕÇÓÇÊËÔ, ÐÂÃÎá-AEÂÄÛËÌÔâ ÇÅÓÂÐÑÏ Ä "ÔÒËÐÐËÐÅÑÄÞØ" ÒÎÇÐÍÂØ [73] [77] Ë ¬¥² [78,79], AEÄÖØ ÔÑÃÔÕÄÇÐÐÞØ ÔÇÅÐÇÕÑàÎÇÍÕÓËÍÂØ Ô ×ÂÊÑÄÞÏ ÒÇÓÇØÑAEÑÏ ÒÇÓÄÑÅÑ ÓÑAEÂ, Â ÕÂÍÉÇ Ä ÔÇÅÐÇÕÑàÎÇÍÕÓËÚÇÔÍËØ ÉËAEÍËØ ÍÓËÔÕÂÎÎÂØ, ËÏÇáÜËØ ÐÇÔÑÃÔÕÄÇÐÐÞÌ ×ÂÊÑÄÞÌ ÒÇÓÇØÑAE ÒÇÓÄÑÅÑ ÓÑAEÂ [30]. ©ÂÄËÔËÏÑÔÕß CE dPadE (Ä ×ÑÓÏÇ "ÃÂÃÑÚÍË"), ÔÐâÕÂâ ÒÓË ÓÂÊÐÞØ ÕÇÏÒÇÓÂÕÖÓÂØ Ë ÒÑÍÂÊÂÐÐÂâ ÐÂ ÓËÔ.…”

Section: àLa2mentioning

confidence: 99%

Two-dimensional ferroelectrics

Blinov¹,

Fridkin²,

Palto³

et al. 2000

Uspekhi Fizicheskikh Nauk

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“…Table 1 gives values of dT c adE, E cr , T cr for P(VDF ± TrFE 70 X 30) as well as for BaTiO 3 , KDP, and a ferroelectric liquid crystal. Ferroelectric polymers have a relatively large range of field-induced phase transition temperatures T cr À T co 65 AE 11 C as compared to other ferroelectric materials like BaTiO 3 [14,77], KDP [78,79], and ferroelectric liquid crystals [30] because of the relatively weak van der Waals interaction in the polymers [41].…”

Section: March 2000 Two-dimensional Ferroelectricsmentioning

confidence: 99%

Two-dimensional ferroelectrics

Fridkin¹,

Ducharme²,

Bune³

et al. 2000

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Blinov, L. M.; Fridkin, V. M.; Palto, S.P.; Bune, A. V.; Dowben, Peter A.; and Ducharme, Stephen, "Two-Dimensional Ferroelectrics" (2000). Abstract. The investigation of the finite-size effect in ferroelectric crystals and films has been limited by the experimental conditions. The smallest demonstrated ferroelectric crystals had a diameter of $ 200 A and the thinnest ferroelectric films were $ 200 A thick, macroscopic sizes on an atomic scale. Langmuir ± Blodgett deposition of films one monolayer at a time has produced high quality ferroelectric films as thin as 10 A, made from polyvinylidene fluoride and its copolymers. These ultrathin films permitted the ultimate investigation of finite-size effects on the atomic thickness scale. Langmuir ± Blodgett films also revealed the fundamental two-dimensional character of ferroelectricity in these materials by demonstrating that there is no so-called critical thickness; films as thin as two monolayers (1 nm) are ferroelectric, with a transition temperature near that of the bulk material. The films exhibit all the main properties of ferroelectricity with a first-order ferroelectric ± paraelectric phase transition: polarization hysteresis (switching); the jump in spontaneous polarization at the phase transition temperature; thermal hysteresis in the polarization; the increase in the transition temperature with applied field; double hysteresis above the phase transition temperature; and the existence of the ferroelectric critical point. The films also exhibit a new phase transition associated with the twodimensional layers.

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Dielectric evidence of a first-order transition in KH2PO4

Cited by 32 publications

References 6 publications

Two-dimensional ferroelectrics

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