Effects of hydrostatic pressure on the paraelectric - ferroelectric phase transition in glycine phosphite

Yasuda, Naohiko; Sakurai, Tetsufumi; Czapla, Z.

doi:10.1088/0953-8984/9/23/003

Cited by 23 publications

(29 citation statements)

References 11 publications

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“…The effect of pressure is found to be significant. With increase of pressure, T c decreases with dT c /dp = −11.0 K/kbar [12]. Such a decrease is comparable with the value dT c /dp = −11.8 K/kbar reported for the BPI crystal [13], but is larger than for KDP-type ferroelectrics.…”

Section: Cooh]supporting

confidence: 79%

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Stasyuk¹,

Czapla²,

Dacko³

et al. 2003

Condens. Matter Phys.

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A microscopic model based on the consideration of the proton ordering is proposed for describing the H-bonded ferroelectric crystalline systems with a complex structure of the hydrogen bond network. The model has been used for the investigation of thermodynamics and dielectric properties of the GPI crystal. The symmetry analysis of the order parameters responsible for the mixed (ferro-and antiferroelectric) nature of ordering is performed within the model. The phase transition into the ferroelectric state is described. Changes in the dielectric susceptibility of the crystal are studied in the presence of the transverse external electric field acting along the caxis. The results of measurements of temperature and field dependences of dielectric permittivity ε c in the paraelectric phase are presented. The microscopic mechanism of the observed effects is discussed based on the comparison of theoretical results and experimental data. A conclusion is made about the significant role of the ionic groups connected by hydrogen bonds in the charge transfer. So they make an important contribution into the polarizability of the GPI crystal along the direction of H-bonded chains.

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Section: Cooh]supporting

confidence: 79%

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Stasyuk¹,

Czapla²,

Dacko³

et al. 2003

Condens. Matter Phys.

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“…The shape of the permittivity under uniaxial pressure along the y-or z-axis shifts to lower temperature with pressure, while that applied uniaxial pressure along the x-axis hardly changes. The uniaxial pressure dependence of the shift [7,8].…”

Section: Methodsmentioning

confidence: 99%

“…Kikuta et al is the weaker one in intermolecular forces. Effect of hydrostatic pressure on the dielectric properties in GPI and deuterated GPI has been reported [8,9]. Temperature of the phase transition decreases with increasing pressure with a slope dT H C /d p = −11.0 K/kbar for GPI and dT D C /d p = −5.0 K/kbar for deuterated GPI, respectively.…”

Section: /[346]mentioning

confidence: 99%

Influence of Uniaxial Pressure on the Phase Transition of Partially Deuterated Glycinium Phosphite

et al. 2004

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Influence of uniaxial pressure on the phase transition of glycinium phosphite crystal has been studied by measurement of the permittivity along the b-axis. The pressure was applied to the crystal along the three principal axes a * , b and c. It has a tendency that the phase transition temperature shifts towards lower temperature with increasing uniaxial pressure. The uniaxial pressure dependence of the each principal axes on the phase transition temperature of 75% deuterated GPI crystal is dT D75% C /dp a * = −0.07 K/kbar for the a * -axis, dT D75% C /dp b = −2.57 K/kbar for the b-axis and dT D75% C /dp c = −1.33 K/kbar for the c-axis, respectively.

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“…5) In addition, GPI shows pronounced isotope effect on T C by deuterium substitution, where T C raises to about 100 K by the deuteration. 6,7) An X-ray structure analysis performed in the P phase at 293 K and in the F phase at 193 K clarified about the oxygens in the tetrahedral HPO 2À 3 anions and the hydrogens in the hydrogen bonds forming the chains as follow. 4) In the F phase, the hydrogens are partially disordered with asymmetrical distribution of electron density and thermal parameters of the oxygens are rather reduced compared to those in the P phase.…”

Section: Introductionmentioning

confidence: 99%

Neutron Diffraction Study of Crystal Structures of Glycinium Phosphite H₃NCH₂COOH·H₂PO₃in Paraelectric and Ferroelectric Phases

2003

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Crystal structure of H 3 NCH 2 COOHÁH 2 PO 3 was studied in the paraelectric phase (P phase) at 298 K and in the ferroelectric phase (F phase) at 170 K by means of the single crystal neutron diffraction. Two independent protons in the hydrogen bonds forming the H(HPO 3 ) À chains are disordered over two sites with the separations of 0.486(3) and 0.474 (5) A in the P phase. In the F phase, they are ordered at a position nearly equal to one of two sites related by the disorder. With the proton order, lengths of the P-O bonds with the oxygens involved in the hydrogen bonds forming the chain deviate from their values determined in the P phase. A possible mechanism for the appearance of the spontaneous polarization is discussed in connection with the deformation of the HPO 2À 3 anions in the F phase.

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Effects of hydrostatic pressure on the paraelectric - ferroelectric phase transition in glycine phosphite

Abstract: The dielectric properties of the crystal were investigated under hydrostatic pressure. Pressure effects on its dielectric properties are due to the shift of the paraelectric - ferroelectric transition temperature with pressure. With increasing pressure p, decreases greatly with .

Cited by 23 publications

References 11 publications

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Influence of Uniaxial Pressure on the Phase Transition of Partially Deuterated Glycinium Phosphite

Neutron Diffraction Study of Crystal Structures of Glycinium Phosphite H₃NCH₂COOH·H₂PO₃in Paraelectric and Ferroelectric Phases

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Effects of hydrostatic pressure on the paraelectric - ferroelectric phase transition in glycine phosphite

Abstract: The dielectric properties of the crystal were investigated under hydrostatic pressure. Pressure effects on its dielectric properties are due to the shift of the paraelectric - ferroelectric transition temperature with pressure. With increasing pressure p, decreases greatly with .

Cited by 23 publications

References 11 publications

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Proton Ordering Model of Phase Transitions in Hydrogen Bonded Ferrielectric Type Systems: The Gpi Crystal

Influence of Uniaxial Pressure on the Phase Transition of Partially Deuterated Glycinium Phosphite

Neutron Diffraction Study of Crystal Structures of Glycinium Phosphite H3NCH2COOH·H2PO3in Paraelectric and Ferroelectric Phases

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Neutron Diffraction Study of Crystal Structures of Glycinium Phosphite H₃NCH₂COOH·H₂PO₃in Paraelectric and Ferroelectric Phases