Growth and Kinetic Measurements of Triglycine Sulphate Crystals

Alexandru, H.V.; Berbecaru, C.

doi:10.1002/crat.2170300305

Cited by 27 publications

(5 citation statements)

References 24 publications

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“…Crystal growth conditions of pure crystal were intensively studied [2][3][4][5]. Synthesis and purification of the basic material, by fractional recrystallization, peculiar growth kinetic of the crystal and the influence of impurities were previously studied [4].…”

Section: Introductionmentioning

confidence: 99%

Pyroelectric coefficient manipulation in doped TGS crystals

Alexandru¹,

Berbecaru²,

Ion³

et al. 2006

Applied Surface Science

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Section: Introductionmentioning

confidence: 99%

Pyroelectric coefficient manipulation in doped TGS crystals

Alexandru¹,

Berbecaru²,

Ion³

et al. 2006

Applied Surface Science

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“…The dielectric, optical and thermal properties of TGS have been studied extensively [24,25]. Single crystal TGS was grown from an aqueous solution of sulfuric acid, containing a greater than three-fold excess of glycine [26]. Nanoindentation experiments were performed using a fully calibrated NanoTest instrument (from MicroMaterials, Ltd., UK) with a diamond sphero-conical Rockwell indenter with a nominal radius of 50 µm in load controlled mode.…”

Section: Methodsmentioning

confidence: 99%

A Novel In-Situ Nanoindentation Characterization of Phase Transforming Materials

2015

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Materials with different allotropes can undergo one or more phase transformations based on the changes in the thermodynamic states. Each phase is stable in a certain temperature/pressure range and can possess different physical and mechanical properties compared to the other phases. The majority of material characterizations have been carried out for materials under equilibrium conditions where the material is stabilized in a certain phase and a lesser portion is devoted for onset of transformation. Alternatively, in situ measurements can be utilized to characterize materials while undergoing phase transformation. However, most of the in situ methods are aimed at measuring the physical properties such as dielectric constant, thermal/electrical conductivity and optical properties. Changes in material dimensions associated with phase transformation, makes direct measurement of the mechanical properties very challenging if not impossible. In this study a novel non-isothermal nanoindentation technique is introduced to directly measure the mechanical properties such as stiffness and creep compliance of a material at the phase transformation point. Single crystal ferroelectric triglycine sulfate (TGS) was synthetized and tested with this method using a temperature controlled nanoindentation instrument. The results reveal that the material, at the transformation point, exhibits structural instabilities such as negative stiffness and negative creep compliance which is in agreement with the findings of published works on the composites with ferroelectric inclusions.

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“…The basic TGS substance was synthesized from aminoacetic and sulphuric acid. Two fractional recrystallizations were performed in order to improve the substance quality [13,14]. Middle fraction of the first crystallization was used for the second recrystallization, in order to eliminate presumed impurities with segregation coefficients higher and lower than one.…”

Section: Crystal Growth and Sample Preparationmentioning

confidence: 99%

Triglycine Sulphate Dynamics of Domains in Relation With Temperature and Bias Field

Alexandru¹,

Marinel²,

Ganea³

2021

AnnalsARSciPhysChem

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Triglycine sulphate crystal (TGS) is a hybrid organic-inorganic ferroelectric crystal with a large electronic band-gap, transparent in visible spectra. It has large applications in electronics, as thermal IR detector. Pure and doped TGS crystals of 3-5 cm linear dimensions were grown at constant temperature in the paraelectric phase (52 oC), by slow solvent evaporation. Pure TGS samples show non-reproducible values of permittivity and losses in the ferroelectric phase after the “excursion” in the paraelectric phase. Walking up and down the crystal temperature, using a special program, the permitivity and losses were automatically recorded and analyzed. There is a continuous decrease of permittivity towards an equilibrium value during a long period of time. Previous AFM measurements from the literature have revealed peculiar aspects of domain dynamics. The relaxation process of permittivity was considered according to the equation er = A - B exp(-t/t). However, surprisingly, there is not a unique relaxation time t. For the first 500 sec (or so), the relaxation time is t » 7 minutes, while between the next time decades 1.000 - 10.000 - 100.000 sec, it is approximately 1 hour and 8 h respectively. The process is related with the ferroelectric domain’s dynamics, which are more or less strongly pined by dislocations or some other lattice defects.

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Growth and Kinetic Measurements of Triglycine Sulphate Crystals

Cited by 27 publications

References 24 publications

Pyroelectric coefficient manipulation in doped TGS crystals

Pyroelectric coefficient manipulation in doped TGS crystals

A Novel In-Situ Nanoindentation Characterization of Phase Transforming Materials

Triglycine Sulphate Dynamics of Domains in Relation With Temperature and Bias Field

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