• M A Subramanian

      Articles written in Bulletin of Materials Science

    • Solid state studies on rare earth mixed oxide pyrochlores Er2(V1−x Fex)4/3 W2/3O7

      M A Subramanian G Aravamudan G V Subba Rao

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      Complete series of solid solutions exist in the mixed oxide pyrochlore system, Er23+ (V1−x3+ Fex3+)4/3 W23/6+O7, with the crystal structure changing from cubic to rhombohedral atx=0·25. The compounds are semiconductors at 300 K exhibitingp- orn-type behaviour depending on the value ofx. The observed resistivity and Seebeck coefficient data as a function of temperature have been interpreted in terms of a hopping mechanism.

    • Better ceramic substrates through zeolites

      M A Subramanian D R Corbin U Chowdhry

      More Details Abstract Fulltext PDF

      A novel synthetic route for fabricating dense aluminosilicate-based ceramics at relatively low temperatures (⩽1000°C) is described. The method involves ion exchange of an appropriate zeolite powder, followed by fabrication and sintering, to form a dense ceramic. Anorthite, cordierite- andβ-spodumene-based ceramic substrates with attractive physical properties for microelectronic packaging are obtained using these unusual precursors. A brief overview on the property requirements for substrates used in microelectronic packaging is outlined at the beginning of the article.

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