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In 1864, Marc
Delafontaine used optical spectroscopy to conclusively prove that yttrium, terbium, and erbium were separate elements. Ironically, however, the confusion that had been introduced between the names continued. Mosander's proposed names were switched, giving the amethyst compound the name
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Delafontaine moved to the United States of
America, arriving in New York in 1870, and later becoming a naturalized citizen. He taught in
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denied that the two elements existed, failing to confirm the existence of "erbia" and suggesting that its name be applied to "terbia".
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at city high schools, and at a women's college. He also worked as an analytical chemist with the
Chicago Police Department.
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217:"erbium" oxide and the yellow substance the name "terbium" oxide, instead of the other way around as originally proposed.
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Marshall, James L.; Marshall, Virginia R. (October 31, 2014). "Northern
Scandinavia: An Elemental Treasure Trove".
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Tansjö, Levi (December 6, 2012). "Carl Gustaf
Mosander and His Research on Rare Earths". In Evans, C. H. (ed.).
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610:, Verlag von Johan Ambrosius Barth, Leipzig, 1898, p. 344 gives his birthyear as 1838, while Mary Elvira Weeks
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p. 125 says that no documents exist to report his death but it is assumed
Delafontaine passed away in 1911.
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369:(1932). "The discovery of the elements: XVI. The rare earth elements".
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523:"History of the Origin of the Chemical Elements and Their Discoverers"
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Fontani, Marco; Costa, Mariagrazia; Orna, Mary
Virginia (2014).
209:. However, this discovery was hotly contested. Spectroscopist
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185:. All three men are given credit for the element's discovery.
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who was involved in discovering and investigating some of the
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408:. Vol. 1179. ACS Symposium Series. pp. 209–257.
279:(6th ed.). Easton, PA: Journal of Chemical Education.
345:. Springer Science & Business Media. pp. 38–55.
500:. Vol. 4. Griffin & Company. pp. 221–223.
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Thornton, Brett F.; Burdette, Shawn C. (20 May 2015).
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Episodes from the
History of the Rare Earth Elements
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The Lost
Elements: The Periodic Table's Shadow Side
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145:. He also worked at the University of Geneva.
704:This biographical article about a chemist is a
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245:. Oxford University Press. pp. 119–125.
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571:(2nd ed.). CRC Press. pp. 5–7.
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606:p. 125 states that Poggendorff's
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521:Holden, Norman E. (2001-06-29).
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169:, Delafontaine first observed
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371:Journal of Chemical Education
276:The discovery of the elements
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177:chemically separated it from
708:. You can help Knowledge by
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494:Friend, John Newton (1917).
173:spectroscopically. In 1879,
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775:19th-century Swiss chemists
273:Weeks, Mary Elvira (1956).
189:Yttrium, terbium and erbium
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442:"Extricating erbium"
195:Carl Gustaf Mosander
165:In 1878, along with
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458:2014NatCh...6..370P
383:1932JChEd...9.1751W
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167:Jacques-Louis Soret
127:rare earth elements
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367:Weeks, Mary Elvira
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452:(4): 370.
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221:References
193:In 1843,
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623:Fontani
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156:Research
790:Holmium
454:Bibcode
379:Bibcode
304:Bibcode
199:terbium
179:thulium
171:holmium
161:Holmium
141:at the
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108:CĂ©ligny
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207:yttria
203:erbium
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133:Career
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21:Delaf
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573:ISBN
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