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Pramana

, Volume 62, Issue 1, pp 87–94 | Cite as

Ultrasonic measurement of the elastic properties of benzoyl glycine single crystals

  • A V Alex
  • J Philip
Article

Abstract

Certain organic crystals are found to possess high non-linear optical coefficients, often one to two orders of magnitude higher than those of the well-known inorganic non-linear optical materials. Benzoyl glycine is one such crystal whose optical second-harmonic generation efficiency is much higher than that of potassium dihydrogen phosphate. Single crystals of benzoyl glycine are grown by solvent evaporation technique usingN, N-dimethyl formamide as the solvent. All the nine second-order elastic stiffness constants of this orthorhombic crystal are determined from ultrasonic wave velocity measurements employing the pulse echo overlap technique. The anisotropy of elastic wave propagation in this crystal is demonstrated by plotting the phase velocity, slowness, Young’s modulus and linear compressibility surfaces along symmetry planes. The volume compressibility, bulk modulus and relevant Poisson’s ratios are also determined. Variation of the diagonal elastic stiffness constants with temperature over a limited range are measured and reported.

Keywords

Benzoyl glycine non-linear optical crystals elastic constants ultrasonic measurements phase velocity surfaces 

PACS Nos

62.20.Dc 43.35.+d 

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Copyright information

© Indian Academy of Sciences 2004

Authors and Affiliations

  • A V Alex
    • 1
  • J Philip
    • 1
  1. 1.Department of InstrumentationCochin University of Science and TechnologyCochinIndia

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