eng Ansari Education and Research Society Journal of Ultra Scientist of Physical Sciences April 2009 21 1 193 198 jusps-B 1095 article DHEERENDRA SINGH YADAV (dherendra0000@gmail.com) 1 Dharmveer Singh 1 Department of Physics, Agra College, Agra - 282002, UTAR PRADESH -INDIA <p style="text-align: justify;">Using Phillips and Van-Vechten (PVV) theory^1-3, the values of homopolar gap, ionic gap and Penn gap have been evaluated for <em>A-C</em> and <em>B-C</em> bonds in A^IIB^IVC₂^V ternary chalcopyrite semiconductors. Using the above parameters, the bond ionicity (<em> f_i </em>) has been determined. The values obtained are in good agreement with the literature value. The electronic polarizabilities have also been evaluated using the Clausius-Mossotti relation. The values are in good agreement with the ordinary sums of the polarizabilities of individual bonds.</p> <p>&nbsp;</p> https://ultraphysicalsciences.org/paper/1095/ ABC2 Chalcopyrite Semiconductor Compounds Bond ionicity