Kutty, T. R. N. and Tareen, J. A. K. and Mohammed, I. (1985) Correlation between the stability of carbonates in ternary Ln2O3-H2O-CO2 hydrothermal systems and lanthanide systematics. Journal of the less-common metals, 105 (2). pp. 197-209.
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Phase diagrams for ternary Ln2O3-H2O-CO2 systems for the entire lanthanide series (except promethium) were studied at temperatures in the range 100-950 °C and pressures up to 3000 bar. The phase diagrams obtained for the heavier lanthanides are far more complex, with the appearance of a number of stable carbonate phases. New carbonates isolated from lanthanide systems (Ln � Tm, Yb, Lu) include Ln6(OH)4(CO3)7, Ln4(OH)6-(CO3)3, Ln2O(OH)2CO3, Ln6O2(OH)8(CO3)3 and Ln12O7(OH)10(CO3)6. Stable carbonate phases common to all the lighter lanthanides are hexagonal LnOHCO3 and hexagonal Ln2O2CO3. Ln2(CO3)3· 3H2O is stable from samarium onwards and orthorhombic LnOHCO3 is stable from gadolinium onwards. On the basis of the appearance of stable carbonates, four different groups of lanthanides were established: lanthanum to neodymium, promethium to europium, terbium to erbium and thulium to lutetium. Gadolinium is the connecting element between groups II and III. This is in accordance with the tetrad classification for f transition elements. © 1985.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LANTHANUM COMPOUNDS, CARBONATES, INTERMETALLICS, LANTHANIDES |
| Subjects: | F Earth Science > Geology |
| Divisions: | Department of > Earth Science |
| Depositing User: | Dhruva Kumar |
| Date Deposited: | 19 May 2021 09:59 |
| Last Modified: | 19 May 2021 09:59 |
| URI: | http://eprints.uni-mysore.ac.in/id/eprint/13684 |
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