1kg Gadolinium metal 99.95%, rare earth metal

Buy now high purity gadolinium metal with min 99.9% purity

Gadolinium metal is a rare earth metal.

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buy 99,9% gadolinium

price gadolinium 1kg 199 euro

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- Purity: min.: 99,9%

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The silvery-white to grayish-white shiny rare earth metal is ductile and malleable. At temperatures above 1508 K, the densest sphere packing transforms into a body-centered cubic crystal structure. In dry air, gadolinium is relatively stable; in moist air, it forms a non-protective, loosely adhering and exfoliating oxide layer. It reacts slowly with water. In dilute acids it dissolves. The first element of the ytter earths in the periodic table was found spectroscopically by Jean Charles Galissard de Marignac in didymium and gadolinite in 1880. In 1886, he prepared it as a white oxide of samarskite and named it Y of samarskite. In the same year, Paul Emile Lecoq de Boisbaudran also produced gadolinium oxide and named the new element gadolinium after the discoverer of the mineral gadolinite, the Finnish chemist Johan Gadolin. It was not until 1935 that Georges Urbain succeeded in preparing the metal.

Areas of application

In nuclear reactors it is used for the production of control rods, and it is also a component of many magnetic alloys, for example with iron and chromium. It is needed as an MRI contrast agent for pharmaceutical diagnostics as well as for ceramic spray powders. Gadolinium is used in the manufacture of special optical glass and in the production of luminescent materials and fluorescent powders that make radar screens glow green. In the form of gallium gadolinium garnet, it is used to manufacture optical components for laser devices, for example, and as a substrate material for magneto-optical memories.

• as an alloying metal in chromium and iron alloys;
• in electronic components;
• in radar screens for the production of the green phosphor;
• in refrigerators;
• as a contrast agent for magnetic resonance imaging (MRI).

Recovery

After a complex separation of the other gadolinium companions, the oxide is reacted with hydrogen fluoride to form gadoliniuimfluoride. Subsequently, this is reduced with calcium to form calcium fluoride to metallic gadolinium. The separation of remaining calcium residues and impurities is carried out in an additional remelting in vacuum.

Use

Gadolinium is used to produce gadolinium yttrium garnet for microwave applications. Oxysulfides are used to produce green phosphor for photoluminescent screens (radar). Intravenously injected gadolinium(III) compounds, such as gadopentetate dimeglumine, are used as contrast agents in magnetic resonance imaging examinations. For this purpose, complexing agents with a high complexation constant, such as the chelates DTPA (diethylenetriaminepentaacetic acid) and DOTA (1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid, with Gd = gadoteric acid), are used because of the high toxicity of free gadolinium ions. Due to the seven unpaired electrons in the f-shell, gadolinium is strongly paramagnetic. The contrast agent thus allows the surrounding protons - essentially water - to relax more rapidly. This significantly increases the contrast differences between different tissues in an MRI image. These contrast agents can also be used for examinations of the brain, since the gadolinium complexes do not cross the blood-brain barrier in healthy patients and can thus visualize a blood-brain barrier disorder - an indication of a pathological event (e.g., deficient blood supply, tumor, inflammation). Gadolinium gallium garnet has been used in the manufacture of magnetic bubble memory. It is also used in the manufacture of rewritable compact discs. Additions of 1% gadolinium increase the machinability and the high-temperature and oxidation resistance of iron and chromium alloys. Corresponding gadolinium-iron-cobalt alloys can be used for optomagnetic data storage.

Symbol: Gd

Electron configuration: [Xe] 4f75d16s2

Electrons per shell: 2,8,18,25,9,2

Atomic mass: 157,25 u

Atomic number: 64

CAS number: 7440-54-2