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Microstructural and dielectric properties of hot-pressed organic composite: benzil-4-aminobenzophenone

  • R. N. Rai
  • T. S. Panchapagesan
  • K. B. R. Varma
Article

Abstract

Transparent binary organic composites of nonlinear optical (NLO) materials (benzil--4-aminobenzophenone) were prepared by a hot-pressing technique. The microstructural characterization by scanning electron microscope revealed an increase in grain size with increasing hot-pressing conditions. The dielectric studies as a function of frequency (1 kHZ to 10 MHz) show a decrease in dielectric constant with increase in frequency, while it increases with increasing temperature at lower frequencies. The X-ray diffraction studies and infrared spectroscopy confirm the true nature of the composite. An attempt was made to predict the dielectric constants of the present organic composite using Reynolds and Hough as well as Maxwell's equations of dielectric mixture formulae. The theoretically obtained values of the dielectric constants are found to be slightly higher than that of experimental values. The discrepancy in these values is attributed to the non-spherical nature of the crystallites in the composite. © 2001 Kluwer Academic Publishers

Keywords

Grain Size Dielectric Constant Electronic Material Infrared Spectroscopy Dielectric Property 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    J. P. Farges, “Organic conductors” (Marcel Dekker, Inc., New York, 1994).Google Scholar
  2. 2.
    T. Ishiguro and K. Yamaji, “Organic Superconductors” (Springer-Verlag, Berlin, 1990).Google Scholar
  3. 3.
    Ch. Bosshard, K. Sutter, Ph. Pretre, J. Hulliger, M. Florsheimer, P. Kaatz and P. Gunter, “Organic Non linear optical Materials” (Gordon and Breach Publishers, 1995).Google Scholar
  4. 4.
    N. B. Singh, T. Henningsen, R. H. Hopkins, R. Mazelsky, R. D. Hamacher, E. P. Supertzi, F. K. Hopkins, D. E. Zelmon and O. P. Singh, J. Cryst. Growth 128 (1993) 976.Google Scholar
  5. 5.
    M. V. Sankar, K. B. R. Varma, G. V. R. Sharma, A. Srikrishna, B. R. Prasad, C. K. Subramaniam and P. S. Narayanan, Ferroelectrics 156 (1994) 141.Google Scholar
  6. 6.
    M. V. Sankar and K. B. R. Varma, Bull. Mater. Sci. 19(15) (1996) 791.Google Scholar
  7. 7.
    R. B. Lal, H. W. Zhang, W. S. Wang, M. D. Aggarwal, Howard W. H. Lee and Benjamin G. Penn, J. Cryst. Growth 174 (1997) 393.Google Scholar
  8. 8.
    U. S. Rai and R. N. Rai, J. Chem. Mater. 11 (1999) 3031.Google Scholar
  9. 9.
    M. V. Sankar and K. B. R. Varma, J. Non-Cryst Solids 226 (1998) 145.Google Scholar
  10. 10.
    J. A. Reynolds and J. H. Hough, Proc. Phys. Soc. B 70 (1957) 769.Google Scholar
  11. 11.
    J. C. Maxwell, “A Treatise on Electricity and Magnetism” (Dover Publishing, New York, 1954).Google Scholar

Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • R. N. Rai
    • 1
  • T. S. Panchapagesan
    • 1
  • K. B. R. Varma
    • 1
  1. 1.Materials Research centerIndian Institute of ScienceBangaloreIndia

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