11. Eriochrome Black T has also been used to detect the presence of rare earth metals . 12. Especially rare earth metals have been shown to reduce sintering of metal catalysts when alloyed. 13. Pieces of rare earth metal which was discovered as an impurity in the mineral ytterbia. 14. The name " didymium " continued to be used in the rare earth metal industry. 15. The Ames Laboratory retained a focus on chemistry and metallurgy, particularly of the rare earth metals . 16. This reflected the belief at that time that thorium and the rare earth metals were divalent. 17. The converters use rare earth metals , oxides such as cerium and lanthanum, that are plentiful in China. 18. Ferrangol's role has expanded to include management of gold, manganese, non-ferrous, precious and rare earth metals concessions. 19. The following steps and process flow diagram detail the rare earth metal extraction process from the ore. 20. Research carried out by CNRS developed new high-energy hybrid alloys incorporating rare earth metals for the negative electrode.
