| 词汇 | lanthanide |
| 释义 | lanthanide noun[ U ] chemistry specializeduk /ˈlæn.θə.naɪd/ us /ˈlæn.θə.naɪd/ any chemical element in the group of elements that have the atomic numbers 57 to 71 in the periodic table镧系元素（元素周期表中原子序数为57到71的元素） Chemical elements actinium alkali metal americium antimony astatine berkelium brimstone calcium fluorine germanium lithium manganese nickel plutonium quicksilver selenium silicon sodium sulphur transition metal Examples of lanthanidelanthanide The section on rare earths (lanthanides) is also notably strong. In this regard, the use of lanthanides provides a gamma of versatile paramagnetic probes, but still needs to be fully exploited. The reason for the high potency of the lanthanides is probably partly due to their trivalency. These series are, respectively, the lanthanides and the actinides. Due to the lanthanide contraction of the elements in the sixth period, zirconium and hafnium have nearly identical ionic radii. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Lanthanide-mediated epoxidation has been successfully applied to cinnamates and -heteroaryl unsaturated esters. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Contrary to most other lanthanides, which have a close-packed hexagonal lattice, ytterbium crystallizes in the face-centered cubic structure. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Phosphors with lanthanide dopants are also widely used in cathode ray tube technology such as television sets. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The lanthanides elute in order of decreasing atomic number. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Monazite was the only significant source of commercial lanthanides until bastnsite began to be processed in about 1965. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Because of its closed-shell electron configuration, its density and melting and boiling points differ from those of the other lanthanides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Neodymium is not found naturally in metallic form or unmixed with other lanthanides, and it is usually refined for general use. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In an aqueous solution, like compounds of other late lanthanides, soluble lutetium compounds form a complex with nine water molecules. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Other carbon rich stoichiometries are known for some lanthanides. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. About 15000 ton/year of the lanthanides are consumed as catalysts and in the production of glasses. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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