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Journal ArticleDOI

Synthesis, Crystal Growth, Structural, Dielectric and Ferroelectric Properties of N-Acetyl Glycine Phosphite (AGPI) Single Crystals

30 Jun 2011-Ferroelectrics (Informa UK Limited)-Vol. 413, Iss: 1, pp 291-300
TL;DR: In this article, single crystals of N-Acetyl Glycine Phosphite (AGPI) were grown from aqueous solution by low temperature solution growth technique and the presence of functional groups were estimated qualitatively by FTIR analysis.
Abstract: Single crystals of N-Acetyl Glycine Phosphite (AGPI) were grown from aqueous solution by low temperature solution growth technique. Formation of the new crystal has been confirmed by single crystal XRD studies. AGPI belongs to monoclinic system with cell parameters a = 7.419 A, b = 8.487 A, c = 9.791 A. Crystalline quality was found using rocking curve. The presence of functional groups were estimated qualitatively by FTIR analysis. The dielectric studies were carried out to identify the phase transition temperature and to find the dielectric constant. Hysteresis studies were carried out to identify the ferroelectric nature of the material. AFM studies were carried out to understand the ferroelectric surface and the domain structure.
Citations
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Journal ArticleDOI
TL;DR: In this paper, the authors argue that the N-acetyl glycine phosphite crystal grown and characterized in the title paper actually is a glycine-phosphite crystal.
Abstract: We argue that the “N-acetyl glycine phosphite” crystal grown and characterized in the title paper actually is glycine phosphite.

11 citations


Cites background from "Synthesis, Crystal Growth, Structur..."

  • ...[1]) one can expect that respective mass of the grown crystal will be less than 0....

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  • ...The authors of the title paper [1] claim on obtaining of a new crystal “N-acetyl glycine phosphite”, moreover, on discovering of a new ferroelectric....

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  • ...of the infrared spectrum [1] is not acceptable for N-acetylglycine phosphite....

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Journal ArticleDOI
TL;DR: In this paper, the structure optimization of Melaminium N -acetylglycinate dihydrate with the aid of density functional method (B3LYP) was performed at 6-311++G(d,p) level of theory.

10 citations

Journal ArticleDOI
01 Jul 2014-Optik
TL;DR: In this article, it was proved that a so-called novel nonlinear optical glycine barium nitrate potassium nitrate single crystal grown by slow evaporation solution growth technique by Ravishankar et al. (Optik, 2013) is actually the well-known γ-glycine crystal.

10 citations

Journal ArticleDOI
TL;DR: Gopinath et al. as discussed by the authors proved that pure thiourea is formed due to fractional crystallization, in view of no chemical reaction among the reagents employed for crystal growth.
Abstract: Gopinath et al. report to have grown single crystals of thiourea urea magnesium chloride (1) (J Therm Anal Calorim 2012, 109:841–5) and urea thiourea sodium chloride (2) (J Therm Anal Calorim 2012, 110:789–92) from an aqueous solution containing thiourea, urea and magnesium chloride (sodium chloride for 2) by the slow evaporation method. In this letter, it is proved that (1) and (2) are not new metal–thiourea compounds but pure thiourea. In view of no chemical reaction among the reagents employed for crystal growth, thiourea is formed due to fractional crystallization.

7 citations

Journal ArticleDOI
TL;DR: In this article, a new crystalline organic complex -TBANAG has been grown and it's structural, spectral and other properties are studied by both experimental and theoretical approach The tert-butylammonium N-acetylglycinate monohydrate (TBANagh) crystallizes in centro symmetric space group P-1 with lattice parameters a.

5 citations

References
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Journal ArticleDOI

1,181 citations


Additional excerpts

  • ...The full width at half maximum (FWHM) of the diffraction curves is 7 arc sec which is very close to that expected from the plane wave theory of dynamical X-ray diffraction [11]....

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Journal ArticleDOI
TL;DR: In this paper, the annealing effect on the structural perfection of Fe-doped LiNbO3 single crystals has been studied by high-resolution X-ray diffractometry (HRXRD), XRT and Fourier transform infrared (FT-IR) spectroscopy.
Abstract: The annealing effect on the structural perfection of Fe-doped LiNbO3 single crystals has been studied by high-resolution X-ray diffractometry (HRXRD), X-ray topography (XRT) and Fourier transform infrared (FT–IR) spectroscopy. The single crystals, prepared by mixing Li2CO3 and Nb2O5 powders in the molar ratio 48.6:51.4 with 0.05 mol% of iron at 1415 (1) K, were grown by the Czochralski (CZ) method along the [001] direction in air and poled during crystal growth by the application of a DC field. Two low-angle (tilt angle ∼1 arc minute) structural grain boundaries were observed in as-grown specimens. FT–IR spectra revealed that these crystals contain OH− and CO32− ionic defects. Grain boundaries and CO32− ionic defects were successfully removed, while the concentration of OH− ions was considerably reduced by post-growth thermal annealing at elevated temperatures.

318 citations


"Synthesis, Crystal Growth, Structur..." refers background in this paper

  • ...As seen in the figure the curve is quite sharp without any satellite peaks which may otherwise be observed either due to internal structural grain boundaries [10] or due to epitaxial layer formed on the surface of the crystal by organic additives....

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Journal ArticleDOI
TL;DR: Betaine phosphite, an addition compound of the amino acid betaine and phosphorous acid, can be grown in single crystal form from aqueous solutions Structural, optical, dielectric, and caloric data of this new material are reported at least two phase transitions are observed in (CH3)3NCH2COO˙H3PO3.
Abstract: Betaine phosphite, an addition compound of the amino acid betaine and phosphorous acid, can be grown in single crystal form from aqueous solutions Structural, optical, dielectric, and caloric data of this new material are reported At least two phase transitions are observed in (CH3)3NCH2COO˙H3PO3 The lower one, around 216 K, leads to a ferroelectric phase with a spontaneous polarization of about 17 μC/cm2

96 citations

Journal ArticleDOI
TL;DR: In this article, a new Gly · H 3 PO 3 crystal was grown and its physical properties were investigated, and DSC measurements revealed a phase transition at about 224.7 K along the b-axis.

96 citations


"Synthesis, Crystal Growth, Structur..." refers background in this paper

  • ...In the glycine phosphite crystals ferro electricity was shown for the first time by differential scanning calorimetric (DSC) and dielectric measurements [4]....

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Journal ArticleDOI
TL;DR: In this article, single crystals of a recent ferroelectric material, glycine phosphite were grown from aqueous solution employing the techniques of slow cooling and controlled evaporation.

70 citations


"Synthesis, Crystal Growth, Structur..." refers background in this paper

  • ...It has been reported that the measured value of dielectric constant along b-axis peaked at the transition temperature of 224 K (pure GPI) for a frequency of 10 kHz [12]....

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