Characterization of Ferroelectric Phase Transition in GPI Crystal

Tchukvinskyi, R.; Cach, R.; Czapla, Z.; Dacko, S.

doi:10.1002/(sici)1521-396x(199801)165:1<309::aid-pssa309>3.0.co;2-u

Cited by 39 publications

(8 citation statements)

References 10 publications

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“…This familiar crystal has spontaneous polarization parallel to the monoclinic b -axis below the transition temperature. Glycine phosphite crystals have been grown and investigated by many researchers to explain the mechanism behind their growth, phase transition and thermal properties [7][8][9][10]. But no growth detail with the addition of dopant with GPI has been reported so far.…”

Section: Introductionmentioning

confidence: 93%

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

Vizhi

Kalainathan²,

Narayana

2008

Cryst. Res. Technol.

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Ferroelectric Glycine Phosphite (GPI) crystal have been grown from aqueous solution employing the slow cooling technique. As the crystal solubility in water depends on temperature, single crystals were grown. Transparent, colourless crystals with habit morphology weighing about 8g were obtained with in a month. The same procedure was used to grow single crystals of 10 wt% of Thiourea doped GPI (TUGPI). Formation of a new crystal was confirmed by Powder X-ray diffraction studies as well as FTIR studies. Crystalline quality were found using rocking curve for both the crystals. Due to the presence of Thiourea in TUGPI, it improves the crystalline perfection and also enhances the growth rate. The variation of hardness on (010) faces of monoclinic GPI and TUGPI crystals, with load were studied .Vickers hardness numbers, H v were found to decrease with the increase in load. The value of Mayer's index 'n' was found to be greater than 1.6 for GPI and TUGPI showing soft-material category. The results are discussed in detail.

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Section: Introductionmentioning

confidence: 93%

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

Vizhi

Kalainathan²,

Narayana

2008

Cryst. Res. Technol.

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“…The measurements of dielectric constant along the b-axis were performed. The temperature behavior of the ε b component as well as the spontaneous polarization P s were studied; the conclusion was made that the phase transition can be regarded as the one close to a tricritical [6]. The absolute value of P s in the state of saturation (∼ 5 × 10 −3 C/m 2 [7]) is considerably smaller in comparison to other crystals of hydrogen bonded fam-ily.…”

Section: Cooh]mentioning

confidence: 99%

“…We see that due to the considered mechanism the χ zz component of susceptibility can about three times exceed the χ yy component. The observed ratio of the ε c and ε b permittivities at room temperature is much larger (ε c /ε b ∼ 10 [6,7]). The long-range interaction, which favours the proton arrangement characteristic of the hypothetic F phase, can be the additional reason for such an anomaly.…”

Section: Phase Transition In Proton Subsystemmentioning

confidence: 99%

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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“…Several macroscopic and microscopic properties of GPI have been investigated by researchers to elucidate the phenomena underlying its behavior. [5][6][7][8][9] However, a complete analysis of the elastic properties of this crystal has not been attempted yet, perhaps due to the complexities involved in working with monoclinic systems. Nevertheless, the wave velocities of selected elastic modes across phase transition have been measured earlier using ultrasonic echo overlap 10 and Brillouin scattering methods.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic investigation of elastic properties and a phase transition in ferroelectric glycine phosphiteNH3CH2
Deepthy
¹
,
Bhat
²
,
Alex
³

et al. 2000
Phys. Rev. B
22
0
11
0
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A detailed ultrasonic study of the elastic properties of glycine phosphite single crystals has been carried out at room temperature as well as across the ferroelectric phase-transition temperature. All 13 elastic stiffness moduli of this monoclinic crystal at room temperature have been determined by measuring the velocities of ultrasonic waves of different polarizations, propagating along different symmetry directions using the pulse echo overlap technique. The anisotropy in elastic wave propagation is established employing polar plots of the phase velocity surfaces in the ab, ac, and bc planes. Variation of selected mode velocities with temperature establishes the reported ferroelectric phase transition in this crystal at 224 K.

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Characterization of Ferroelectric Phase Transition in GPI Crystal

Cited by 39 publications

References 10 publications

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

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

Ultrasonic investigation of elastic properties and a phase transition in ferroelectric glycine phosphiteNH3CH2
Deepthy
¹
,
Bhat
²
,
Alex
³

et al. 2000
Phys. Rev. B
22
0
11
0
View full text Add to dashboard Cite

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Characterization of Ferroelectric Phase Transition in GPI Crystal

Cited by 39 publications

References 10 publications

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

Structural and microhardness studies of pure and thiourea doped glycine phosphite single crystal

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

Ultrasonic investigation of elastic properties and a phase transition in ferroelectric glycine phosphiteNH3CH2Deepthy1, Bhat2, Alex3 et al. 2000Phys. Rev. B220110View full textAdd to dashboardCite

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Ultrasonic investigation of elastic properties and a phase transition in ferroelectric glycine phosphiteNH3CH2
Deepthy
¹
,
Bhat
²
,
Alex
³

et al. 2000
Phys. Rev. B
22
0
11
0
View full text Add to dashboard Cite