The Discovery & Evolution of Rare Earth Elements

The history of rare earth elements is a fascinating journey from their initial discovery in the late 18th century to their critical role in modern technology. This article explores the timeline and key milestones in the development of REE utilisation.

Early Discoveries: The first rare earth element, yttrium, was discovered in 1794 by Finnish chemist Johan Gadolin. This was followed by the identification of cerium, lanthanum, and other REEs in the 19th century.

Advancements in Chemistry: The separation and purification of REEs were significant challenges that were gradually overcome with advancements in chemistry and metallurgy.

Industrial Revolution: The industrial applications of REEs began to emerge in the 20th century, with uses in lighting, glass manufacturing, and early electronics.

Modern Era: The late 20th and early 21st centuries saw an explosion in the demand for REEs, driven by the development of high-tech devices, renewable energy technologies, and advanced defence systems.

The historical development of rare earth elements reflects the broader progress of science and industry. Today, REEs are at the heart of technological innovation, making their history a vital area of study.

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Who How When of Rare Earth Elements

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    Yttrium (Y)

    Discovery: 1794
    Discoverer: Johan Gadolin
    Method: Gadolin discovered yttrium in a mineral called gadolinite from a quarry in Ytterby, Sweden. He identified it as a new element through chemical analysis.
    Immediate Repercussions: This discovery opened the door to the identification of other rare earth elements within the same mineral.

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    Cerium (Ce)

    Discovery: 1803
    Discoverers: Martin Heinrich Klaproth, Jöns Jakob Berzelius, and Wilhelm Hisinger independently
    Method: Cerium was discovered in the mineral cerite. Both teams identified it as a new element through chemical analysis.
    Immediate Repercussions: Cerium’s discovery led to further research into the minerals containing rare earth elements.

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    Lanthanum (La)

    Discovery: 1839
    Discoverer: Carl Gustav Mosander
    Method: Mosander separated lanthanum from cerium nitrate. He identified it as a distinct element through its unique properties.
    Immediate Repercussions: The discovery of lanthanum marked the beginning of the differentiation of rare earth elements.

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    Erbium (Er)

    Discovery: 1842
    Discoverer: Carl Gustaf Mosander
    Method: Mosander separated erbium from yttria using chemical methods.
    Immediate Repercussions: Erbium’s discovery contributed to the classification and understanding of the rare earth elements.

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    Terbium (Tb)

    Discovery: 1843
    Discoverer: Carl Gustaf Mosander
    Method: Mosander discovered terbium as a fraction of the mineral yttria, using chemical separation techniques.
    Immediate Repercussions: Terbium’s identification was part of the broader effort to understand and categorize rare earth elements.

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    Holmium (Ho)

    Discovery: 1878
    Discoverers: Marc Delafontaine and Jacques-Louis Soret, independently by Per Teodor Cleve
    Method: Holmium was identified through spectroscopic analysis of erbium oxide residues.
    Immediate Repercussions: The discovery was a step forward in distinguishing the rare earth elements.

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    Thulium (Tm)

    Discovery: 1879
    Discoverer: Per Teodor Cleve
    Method: Thulium was separated from the mineral erbia using chemical analysis.
    Immediate Repercussions: Thulium’s identification added to the expanding catalogue of rare earth elements.

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    Scandium (Sc)

    Discovery: 1879
    Discoverer: Lars Fredrik Nilson
    Method: Scandium was discovered in the minerals euxenite and gadolinite. Nilson used spectroscopic analysis to identify the new element.
    Immediate Repercussions: Scandium’s discovery confirmed Dmitri Mendeleev’s predictions about the periodic table, supporting the periodic law.

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    Samarium (Sm)

    Discovery: 1879
    Discoverer: Paul Émile Lecoq de Boisbaudran
    Method: Samarium was discovered in the mineral samarskite through spectroscopic analysis.
    Immediate Repercussions: Its discovery added to the growing list of rare earth elements, enhancing the study of their chemical properties.

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    Gadolinium (Gd)

    Discovery: 1880
    Discoverer: Jean Charles Galissard de Marignac
    Method: Gadolinium was discovered in the mineral gadolinite using spectroscopic analysis.
    Immediate Repercussions: The discovery contributed to the knowledge of rare earth elements and their chemical behaviours.

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    Dysprosium (Dy)

    Discovery: 1886
    Discoverer: Paul Émile Lecoq de Boisbaudran
    Method: Dysprosium was separated from holmium oxide using spectroscopic methods.
    Immediate Repercussions: Dysprosium’s magnetic properties were not immediately recognized but would later become crucial in high-tech applications.

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    Praseodymium (Pr)

    Discovery: 1885
    Discoverer: Carl Auer von Welsbach
    Method: Welsbach separated praseodymium from a mixture of rare earth elements using fractional crystallisation.
    Immediate Repercussions: This discovery refined the understanding of rare earth elements and their separation techniques.

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    Neodymium (Nd)

    Discovery: 1885
    Discoverer: Carl Auer von Welsbach
    Method: Alongside praseodymium, neodymium was separated using fractional crystallisation.
    Immediate Repercussions: Neodymium’s strong magnetic properties were recognised, although its applications came later..

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    Europium (Eu)

    Discovery: 1896
    Discoverer: Eugène-Anatole Demarçay
    Method: Demarçay separated europium from samarium-gadolinium concentrates using spectroscopic methods.
    Immediate Repercussions: Europium’s phosphorescent properties would later become significant in the development of TV and LED technology.

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    Ytterbium (Yb)

    Discovery: 1878
    Discoverer: Jean Charles Galissard de Marignac
    Method: Ytterbium was separated from the mineral ytterbia using chemical separation techniques.
    Immediate Repercussions: The discovery helped refine the understanding of rare earth minerals and their compositions.

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    Lutetium (Lu)

    Discovery: 1907
    Discoverers: Georges Urbain, Carl Auer von Welsbach, and Charles James independently
    Method: Lutetium was identified through separation from ytterbium using fractional crystallization and spectroscopic analysis.
    Immediate Repercussions: Lutetium’s discovery marked the completion of the identification of the naturally occurring rare earth elements.

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    Promethium (Pm)

    Discovery: 1945
    Discoverers: Jacob A. Marinsky, Lawrence E. Glendenin, and Charles D. Coryell
    Method: Promethium was identified in the fission products of uranium during research at Oak Ridge National Laboratory.
    Immediate Repercussions: The discovery filled a gap in the periodic table but had limited immediate practical applications due to its radioactivity.

The discovery of rare earth elements spanned over a century with the earliest found in the late 18th century and the latest in the mid-20th century and involved numerous scientists and advances in chemical and spectroscopic techniques.

Each discovery not only contributed to the understanding of the periodic table but also paved the way for technological advancements.

While immediate repercussions were often limited to scientific knowledge, the long-term impacts of these discoveries have been profound, influencing everything from electronics and renewable energy to medical technology and defence systems.

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