• T R Narayanan Kutty

      Articles written in Journal of Chemical Sciences

    • Hydrothermal equilibria in Nd2O3−H2O−CO2 system

      T R Narayanan Kutty M N Viswanathiah J A K Tareen

      More Details Abstract Fulltext PDF

      Isobaric equilibria in Nd2O3−H2O−CO2 system have been determined at 1500 atmospheres and temperature range of 200–900°C. The mole fraction of CO2 and H2O in the fluid phase were varied from 0·0 to 1·0. The stable phases are Nd(OH)2-hexagonal, Nd(OH)CO2-hexagonal, Nd2O2CO2-hexagonal and NdOOH-monoclinic. Nd(OH)2 is stable only when$$X_{CO_2 } $$ is less than 0·008. The stability field of Nd(OH)2 extends parallel to temperature axis. Thus, Nd(OH)3 coexists with all the other phases. When$$X_{CO_2 } = 1 \cdot 0$$, the only stable phase is Nd2O2CO3-hexagonal.

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