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    • Keywords


      Hydrothermal equilibria; rare earth carbonates

    • Abstract


      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.

    • Author Affiliations


      T R Narayanan Kutty1 M N Viswanathiah2 J A K Tareen2

      1. Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore - 560 012
      2. Mineralogical Institute, Manasa Gangotri, Mysore - 570 006
    • Dates

  • Journal of Chemical Sciences | News

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