Yttrium REE Collection rare earth metals elements

Yttrium

Yttrium leapt to fame as the first impure oxide of the rare earths to be discovered. Not even Johann Gadolin dreamt of what his discovery was to foretell for the future of mankind. Not to be stopped, many others would join the quest to unearth these rare earths, a journey that would take a century and a half.

Applications

  • Yttrium phosphors are used in energy efficient fluorescent lamps and bulbs.
  • Yttria is used to create cubic zirconia jewelry, a diamond simulant.
  • Fighter jet engines use Yttria-stabilized zirconia as thermal barrier to withstand extreme heat.
  • Yttrium based lasers (Nd:YAG) are used commercially in industrial, medical, graphic arts, and defense applications. These beams are used for precision cutting, welding, etching, boring, ranging and targeting.
  • Yttrium-iron garnets (YIG) are used in the electronic components for missile defense systems.
  • Yttrium provides a high temperature corrosion resistance in cutting tools.

Interesting Facts

  • Nd:YAG lasers are used to remove tattoos.
  • Nd:YAG lasers are used to cut holes through needles, allowing them to be thinner and less painful.

Discovery

Swedish Army Lieutenant Carl Axel Arrhenius collected a black dense mineral in 1787 near the small feldspar and quartz mine at Ytterby, Sweden. Arrhenius sent the mineral to the laboratory of Bengt Reinhold Geijer of the Royal Mint of Sweden, who published a short description of the mineral (Geijer, 1788). Geijer wrote that he forwarded the "specimen of a heavy stone which one of my friends, Hr. Lieut. Arrenhius found" to Finnish chemist Johan Gadolin at the University of Abo, Finland. In 1794, Johan Gadolin analyzed and discovered approximately 38 percent of a new "earth" in the new heavy mineral ytterbite (later renamed gadolinite)(Gadolin, 1794). In 1797, Anders G. Ekeberg of Uppsala confirmed the findings of Gadolin and proposed the name gadolinite for the mineral to honor Johan Gadolin and yttria for the "new earth" (Weeks and Leicester, 1968, p. 667). Yttrium is named for the mine location in Sweden where the yttrium-bearing mineral was discovered, Ytterby.

Definition

Yttrium is a silvery-metallic dark grey lustrous metal that is relatively stable in air. Finely divided yttrium metal is very unstable in air and turnings of the metal will ignite at temperatures above 400 °C. The metal is soft and ductile. It has a hexagonal close-packed structure, a density of 4.478 gm/cm3, a melting point of 1522 °C, and a boiling point of 3338 °C. Yttrium oxide, or yttria, occurs as a sesquioxide with the formula Y2O3. The oxide is a white powder with a specific gravity of 5.0 gm/cm3 and a formula weight of 225.81.

Preparation of Metal

Yttrium metal is typically prepared by calciothermic reduction of the trihalide, typically YF3, in a tantalum crucible. A tungsten crucible can be used if an impurity level of 0.07 atomic weight percent tungsten could be tolerated. Yttrium metal has a high melting point with a vacuum melting temperature of 1850 °C, similar to Gd, Tb, and Lu. The high vacuum melting temperature necessitates a distillation step to remove tantalum impurities introduced during the reduction and vacuum melting steps. The distillation process is done in a tungsten crucible and occurs at a slow rate to keep impurities at a low level. A vacuum of better than 1.3 x 10-6 Pa is needed (Beaudry and Gschneidner, Jr., 1978).

Source

Large resources of yttrium in monazite and xenotime are available worldwide in ancient and recent placer deposits, carbonatites, uranium ores, and weathered clay deposits (ion-adsorption ore). It occurs in the Earth's crust at an average concentration of 33 parts per million. Additional large subeconomic resources of yttrium occur in apatite-magnetite-bearing rocks, deposits of niobium-tantalum minerals, non-placer monazite-bearing deposits, sedimentary phosphate deposits, and uranium ores, especially those of the Blind River District near Elliot Lake, Ontario, Canada, which contain yttrium in brannerite, monazite, and uraninite. Additional resources in Canada are contained in allanite, apatite, and britholite at Eden Lake, Manitoba; allanite and apatite at Hoidas Lake, Saskatchewan; fergusonite and xenotime at Nechalacho (Thor Lake), Northwest Territories; and eudialyte-(Y), mosandrite, and britholite at Kipawa, Quebec. It occurs in various minerals in differing concentrations and occurs in a wide variety of geologic environments, including alkaline granites and intrusives, carbonatites, hydrothermal deposits, laterites, placers, and vein-type deposits (Hedrick, 2010).

Mining

Yttrium is mined from a variety of ore minerals and deposits using various methods. Monazite and xenotime are recovered from heavy-mineral sands (specific gravity >2.9) deposits in various parts of the world as a byproduct of mining zircon and titanium-minerals or tin minerals. The heavy mineral sands are recovered using floating dredges or surface excavation by shovels, front loaders, or water jet methods. Vein monazite has been mined by hardrock methods in South Africa and the United States. Yttrium has also been recovered from uranium raffinates from in the Elliot Lake region of Canada. In Kyrgyzstan, yttrium was recovered using hard-rock methods from synchysite-(Y) from the open-pit Kutessai-II deposit near Aktyuz. Argillaceous marine sediments enriched in fossil fish remains at the Melovie deposit in Kazakhstan were previously recovered for their uranium and rare-earth content, including yttrium. The main source of the world's yttrium is the ion-adsorption lateritic clays in the southern provinces of China, primarily Fujian, Guangdong, and Jiangxi, with a lesser number of deposits in Guangxi and Hunan. These deposits are mined by leaching methods (Hedrick, 2010)

Selected yttrium minerals

Gadolinite-(Y) Y2Fe2+Be2(Si2O10)
Xenotime Y(PO4)
Synchysite-(Y) Ca(Y,Ce)(CO3)2F
Eudialyte-(Y) Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2
Mosandrite Na2Ca4(REE)(Si2O7)2OF3
Britholite-(Y) Ca2(Y,Ca)3(SiO4,PO4)3(OH,F)
Monazite (Ce,La,Nd,Th)(PO4) Ion adsorption lateritic clays Y-enriched lateritic clays
Brannerite (U4+,REE,Th,Ca)(Ti,Fe3+,Nb)2(O,OH)6

References

Beaudry and Bernard J. and Karl A. Gschneidner, Jr., 1978, Preparation and Basic Properties of the Rare Earth Metals: chapter 2 in Handbook of the Physics and Chemistry of Rare Earths-Volume 1:Metals, (Gschneidner, Jr. and Eyring, editors), North-Holland, New York, p. 173-232.

Gadolin, Johan, 1794, Undersökning av en svart tung stenart ifrån Ytterby stenbrott I Roslagen: Kungl. Svenska Vetenskapsakademien Handlingar, p,137-155.

Geijer, Bengt R., 1788, (letter to the editor without title): Crell's Annalen, p. 229-230.

Hedrick, James B., 2010, Yttrium: chapter in Mineral commodity summaries 2010, U.S. Geological Survey, p. 182-183.

Parker, R.L, and J.W. Adams, 1973, Niobium (columbium) and tantalum: chapter in United States Mineral Resources, (D.A. Brobst and W.P. Pratt, eds.) U.S. Geological Survey Professional Paper 820, p. 443-454.

Weeks, Mary E., and Henry M. Leicester, 1968, Discovery of the Elements (7th ed.): Easton, Pennsylvania, Journal of Chemical Education, 896 p.

Electrons per shell:
2, 8, 18, 9, 2
Atomic number,
Protons, Electrons:
39
Number of Neutrons:
50
Atomic Mass:
88.90585 amu
Melting Point:
1522 °C
Boiling Point:
3338 °C
Density @ 293 K:
4.469 g/cm3
Crystal structure:
hexagonal
Color:
silvery