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Large single crystals of an organic nonlinear optical (NLO) material, benzil, have been grown by employing an indigenously built Bridgman-Stockbarger crystal growth system. The dielectric constant (c r ), dielectric loss tangent (tan 5) and impedance (Z) of these crystals, monitored along the crystallographic a-axis, as a function of frequency in the IQOkHz-lOMHz range, exhibit sharp resonance effects in the 100-300kHz region. These strong resonance effects are attributed to the piezoelectricdoi:10.1007/bf02745199 fatcat:pdeapdf5xzfv3j5rs4udypuada