Abstract
THE two oxides of praseodymium described in the literature are the light green sesquioxide and the dark brown ‘air-ignited’ oxide. It is generally agreed that the composition of the latter approximates to Pr6O11. Prandtl and his school1 claim that praseodymium can exhibit a higher valency of 5, and on this basis designate the air-ignited oxide as 2Pr2O3.Pr2O5. Marsh2 affirms, however, that praseodymium possesses a maximum valency of 4, a conclusion which is well supported by the work of Zintl and Morawietz3, and represents Pr6O11 as the double oxide, 4PrO2.Pr2O3.
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References
Prandtl, Z. anorg. Chem., 149, 235 (1925); 238, 225 (1938).
Marsh, J. Chem. Soc., 15 (1946).
Zintl and Morawietz, Z. anorg. Chem., 245, 26 (1940).
Wilson, Proc. Roy. Soc., A, 133, 458 (1931); 134, 277 (1932).
Pauling, Z. Krist., 69, 415 (1928).
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MARTIN, R. Oxides of Praseodymium. Nature 165, 202–203 (1950). https://doi.org/10.1038/165202b0
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DOI: https://doi.org/10.1038/165202b0
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