| 释义 |
Definition of didymium in English: didymiumnoun dɪˈdɪmɪəmdīˈdimēəm mass nounChemistry A mixture containing the rare earth elements praseodymium and neodymium, used to colour glass for optical filters. It was originally regarded as a single element. Example sentencesExamples - This showed that considerably higher properties at elevated temperatures can be developed by didymium (neodidymium plus praseodidymium) and by cerium-free MM than by MM.
- The discovery of praseodymium is credited to the Austrian chemist Carl Auer who found that a previously discovered element, didymium, was actually a mixture of two other new elements.
- Didymia, and its supposed elemental associate, didymium, then vanished from the chemical pantheon.
- In 1879 Paul-Emile Lecoq, gallium's discoverer, announced that there was another element contaminating didymium, which he called samarium.
Origin Mid 19th century: from Greek didumos 'twin' (because it was closely associated with lanthanum) + -ium (used as a suffix for new metals). Definition of didymium in US English: didymiumnoundīˈdimēəm Chemistry A mixture containing the rare earth elements praseodymium and neodymium, used to color glass for optical filters. It was originally regarded as a single element. Example sentencesExamples - The discovery of praseodymium is credited to the Austrian chemist Carl Auer who found that a previously discovered element, didymium, was actually a mixture of two other new elements.
- Didymia, and its supposed elemental associate, didymium, then vanished from the chemical pantheon.
- This showed that considerably higher properties at elevated temperatures can be developed by didymium (neodidymium plus praseodidymium) and by cerium-free MM than by MM.
- In 1879 Paul-Emile Lecoq, gallium's discoverer, announced that there was another element contaminating didymium, which he called samarium.
Origin Mid 19th century: from Greek didumos ‘twin’ (because it was closely associated with lanthanum) + -ium (used as a suffix for new metals). |