Doped versus pure TGS crystals

Berbecaru, C.; Alexandru, H.V.; Pintilie, L.; Dutu, A.; Logofatu, Bogdan; Radulescu, R.C.

doi:10.1016/j.mseb.2004.12.069

Cited by 34 publications

(24 citation statements)

References 19 publications

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“…1 we may consider the contributions of GI glycin group to the permittivity and loss increases in the -150 ÷ -75 o C temperature range. Glycin units GII and GIII have the same effect in the -75 ÷ + 45 o C, with maxima around -40 o C and respectively 30 o C. Domains walls movement and their temperature evolution have major contributions in the vicinity of the transition temperature [7,11]. On heating and around Curie point a splitting of the domains could be considered together with the wall mobility increase because of the rapid rise of the permittivity values.…”

Section: Discussionmentioning

confidence: 99%

“…Above Curie point around 49.2 o C, the two mirror planes at y = 1/4 and 3/4 in paraelectric state lead the structure to monoclinic and centrosymmetric space group P2 1 /m [6]. Ferroelectric state of TGS crystals show nonreproducible values of permittivity crossing up and down the Curie point [7]. To stabilize the structure various dopants were used, especially amino based compounds because of their similarities with the glycin groups which are partially replaced in the structure [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…Ferroelectric state of TGS crystals show nonreproducible values of permittivity crossing up and down the Curie point [7]. To stabilize the structure various dopants were used, especially amino based compounds because of their similarities with the glycin groups which are partially replaced in the structure [7][8][9]. Doped TGS crystals show more stable and lower values of permittivity and loss crossing up and down Curie temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The aim of our work is to obtain pure and D: alanina doped TGS crystals and to investigate their permittivity and loss behavior on an extended temperature and frequency ranges. [7].…”

Section: Introductionmentioning

confidence: 99%

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Temperature and frequency investigations of the electrical parameters in the TGS ferroelectric transition

Berbecaru¹

2010

Phys. Status Solidi (c)

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Pure and D: alanina doped triglycin sulphate (TGS) crystals were grown from aqueous solutions. Fresh cleaved, polished and silver paste painted samples were temperature and frequency investigated. Pure crystals show nonreproducible values of the permittivity and dielectric loss crossing up and down the Curie point. More stable and much lower values of the permittivity and dielectric loss could be noticed for D: alanina doped crystals. Permittivity and loss values show different frequencies behavior related to polar or nonpolar state of crystals. Frequency dependence of permittivity and loss behavior could be related to the general picture of relaxation of different polarization mechanisms and their contributions to permittivity and loss values for dielectric materials. Much smaller and stable values of permittivity and loss, vs. temperature and frequency, were found for doped crystals. Experimental results point out for a more stable structure with dipoles mobility decreased of doped vs. pure TGS crystals. Thus, higher figure of merit of doped TGS crystals point to a major advantage for technical applications (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The aim of our work is to obtain pure and D: alanina doped TGS crystals and to investigate their permittivity and loss behavior on an extended temperature and frequency ranges. [7].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Temperature and frequency investigations of the electrical parameters in the TGS ferroelectric transition

Berbecaru¹

2010

Phys. Status Solidi (c)

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“…It finds application in the fabrication of infrared detectors, pyroelectric vidicon tube operating at room temperature, in the fabrication of capacitors, transducers and sensors [2][3]. TGS belongs to the biaxial monoclinic system associated with the polar space group P2 1 in the ferroelectric phase and it crystallizes in P2 1 /m space group in the paraelectric phase [4][5][6] .…”

Section: Introductionmentioning

confidence: 99%