Investigation of dielectric, piezoelectric and ferroelectric properties of b-axis grown triglycine sulphate single crystal |
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Authors: | C Justin?Raj Swarup Kundu and K B R Varma |
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Institution: | (1) Ioffe Physico-Technical Institute, 26 Polytechnicheskaya, 194021 Saint Petersburg, Russia;(2) Petersburg Nuclear Physics Institute, Leningrad district, Gatchina, 188300, Russia;(3) Hahn-Meitner-Institut, Glinicker Straβe 100, Berlin, 14 109, Germany;(4) General Innovations and Goods Inc., 2725 Floribunda Drive, Columbus, OH 43209, USA; |
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Abstract: | Large single crystal of triglycine sulphate (dimension 100 mm along monoclinic b-axis and 15 mm in diameter) was grown using the unidirectional solution growth technique. The X-ray diffraction studies confirmed
the growth/long axis to be b-axis (polar axis). The dielectric studies were carried out at various temperatures to establish the phase transition temperature.
The frequency response of the dielectric constant, dielectric loss and impedance of the crystal along the growth axis, was
monitored. These are typically characterized by strong resonance peaks in the kHz region. The piezoelectric coefficients like
stiffness constant (C), elastic coefficient (S), electromechanical coupling coefficient (k) and d
31 were calculated using the resonance-antiresonance method. Polarization (P)-Electric field (E) hysteresis loops were recorded at various temperatures to find the temperature-dependent spontaneous polarization of the
grown crystal. The pyroelectric coefficients were determined from the pyroelectric current measurement by the Byer and Roundy
method. The ferroelectric domain patterns were recorded on (010) plane using scanning electron microscopy and optical microscopy. |
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