# Dielectric dispersion and piezoelectric resonance in an organic electro-optic crystal: $(-)-2- \alpha-$methylbenzylamino-5-nitropyridine

Shankar, MV and Varma, KBR and Bailey, RT and Cruickshank, FR and Pugh, D and Sherwood, JN (1997) Dielectric dispersion and piezoelectric resonance in an organic electro-optic crystal: $(-)-2- \alpha-$methylbenzylamino-5-nitropyridine. In: Journal of Applied Physics, 81 (5). pp. 2370-2374.

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## Abstract

The frequency response of the dielectric constant $(\epsilon _r)$, dielectric loss tangent $(tan \delta)$ and impedance (Z) of an organic electro-optic crystal, $(-)-2- \alpha-$ methylbenzylamino-5-nitropyridine (MBA-NP) monitored along the polar axis, is characterized by the presence of strong peaks in the kHz region. The observed resonance behavior, which is strongly dependent on the geometric size and shape of the sample, is attributed to its piezoelectric nature. The resonance peaks were found to shift steadily towards lower frequencies with increasing temperature and towards higher frequencies with increasing pressure. The temperature dependence of the stiffness coefficient (C) of the crystal has been defined using the resonance data. The temperature dependence of the damping of these piezoelectric vibrations has been monitored by the resonance–anti-resonance method. The influence of the application of pressure and the variation of temperature on $\epsilon _r$ , monitored along the polar axis of the crystal, has been studied.

Item Type: Journal Article Copyright of this article belongs to American Institute of Physics. Division of Chemical Sciences > Materials Research Centre Anka Setty 27 Mar 2007 19 Sep 2010 04:35 http://eprints.iisc.ac.in/id/eprint/9891