Browsing by Author "Sharma, Bachaspatimayum Indrajit"

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    Studies on certain vanadium pentoxide based semiconducting oxide glasses exhibiting majority charge carrier reversal phenomenon
    (2002) Sharma, Bachaspatimayum Indrajit
    Vanadium Pentoxide (V2O5) based glasses form an important class of amorphous semiconductors. V2O5 based glasses are normally n-type semiconductors. The possibility of obtaining p-type semiconductors in some V2O5 based trenary glasses has been pointed out in the literature. After a careful study of the glass-forming region of known V2O5 based glassed systems coupled with the thermoelectric power (TEP) measurements, three glass systems, namely, x V2O5.20SnO.(80-x)TeO2 glasses (18<_ x<_50), x V2O5.40CaO. (60-x) P2O5 glasses (10<_x<_30) and x V2O5.40CaO.(60-x)B2O3 glasses (10<_x<_30) were identified for the present investigations. These three glass systems exhibit a reversal in the carrier type from n-type to p-type when the composition x was systematically varied. Bulk glass samples belonging to the three glass systems were prepared by melt quenching technique. The as-quenched samples were characterized using X-ray diffraction technique, TEP measurement and differential scanning calorimeter (DSC). TEP measurements revealed that the career reversal occurs near 23 mol%V2O5 in V2O5-SnO-TeO2 glasses. In V2O5-CaO-P2O5 and V2O5-CaO-B2O3 glasses, the career reversal was observed at 20 mol%V2O5.