Dysprosium (Dy)
lanthanideSolid
Masse atomique relative standard
162,5 uConfiguration électronique
[Xe] 6s2 4f10Point de fusion
1411,85 °CPoint d’ébullition
2566,85 °CMasse volumique
8550 kg/m³États d’oxydation
0, +1, +2, +3, +4Électronégativité (Pauling)
1,22Énergie d’ionisation (1re)
5,939061 eVAnnée de découverte
1878Rayon atomique
175 pmDétails
Dysprosium is a heavy lanthanide metal with atomic number 66. In compounds it is overwhelmingly trivalent, forming pale salts whose chemistry resembles that of neighboring rare earths. Its technological importance comes from an unusually large magnetic moment and strong magnetic anisotropy, especially when incorporated into high-performance permanent magnets. Natural dysprosium is a mixture of stable isotopes and is obtained with other rare earth elements rather than as a native metal.
The element has a metallic, bright silver luster. It is relatively stable in air at room temperature, and is readily attacked and dissolved by dilute and concentrated mineral acids, to evolve hydrogen. The metal is soft enough to be cut with a knife and can be machined without sparking if overheating is avoided. Small amounts of impurities can greatly affect its physical properties.
The name derives from the Greek dysprositos for "hard to get at", owing to the difficulty in separating this rare earth element from a holmium mineral in which it was found. It was discovered by the Swiss chemist Marc Delafontaine in the mineral samarskite in 1878 and called philippia. Philippia was subsequently thought to be a mixture of terbium and yttrium. It was later rediscovered in a holmium sample by the French chemist Paul-Emile Lecoq de Boisbaudran in 1886, who was then credited with the discovery. Dysprosium was first isolated by the French chemist Georges Urbain in 1906.
Dysprosium was discovered by Paul-Émile Lecoq de Boisbaudran, a French chemist, in 1886 as an impurity in erbia, the oxide of erbium. The metal was isolated by Georges Urbain, another French chemist, in 1906. Pure samples of dysprosium were first produced in the 1950s. Today, dysprosium is primarily obtained through an ion exchange process from monazite sand ((Ce, La, Th, Nd, Y)PO4), a material rich in rare earth elements.
From the Greek word dysprositos, meaning hard to get at. Dysprosium was discovered in 1886 by Lecoq de Boisbaudran, but not isolated. Neither the oxide nor the metal was available in relatively pure form until 1950, when the development of ion-exchange separation and metallographic reduction techniques were created by Spedding and associates. Dysprosium occurs along with other so-called rare-earth or lanthanide elements in a variety of minerals such as xenotime, fergusonite, gadolinite, euxenite, polycrase, and blomstrandine. The most important sources, however, are from monaziate and bastnasite. Dysprosium can be prepared by reduction of the trifluoride with calcium.
Pure dysprosium is a bright, silvery metal when freshly cut, but it slowly tarnishes in air. It is relatively soft and can be machined, though the metal is reactive enough that clean surfaces require protection. At ordinary temperature it is paramagnetic; it develops more ordered magnetic states only at low temperatures.
The largest practical use of dysprosium is as an additive to neodymium-iron-boron permanent magnets, where it improves resistance to demagnetization at elevated temperature. This is important in traction motors, wind-turbine generators, and compact actuators, although manufacturers try to minimize the amount used because supply is constrained. Dysprosium is also used in Terfenol-D magnetostrictive alloy, in some specialty lighting and laser materials, and as neutron-absorbing material in selected nuclear-technology applications.
There are no commercial applications for dysprosium. Since it easily absorbs neutrons and has a high melting point, dysprosium might be alloyed with steel for use in nuclear reactors. When combined with vanadium and other rare earth elements, dysprosium is used as a laser material.
Dysprosium oxide (Dy2O3), also known as dysprosia, is combined with nickel and added to a special cement used to cool nuclear reactor rods. Other dysprosium compounds include: dysprosium fluoride (DyF3), dysprosium iodide (DyI3) and dysprosium sulfate (Dy2(SO4)3).
While we have not found many applications for dysprosium, its thermal neutron absorption cross-section and high melting point suggest metallurgical uses in nuclear control applications and for alloying with special stainless steels. A dysprosium oxide-nickel cement has found use in cooling nuclear reactor rods. This cement absorbs neutrons readily without swelling or contracting under prolonged neutron bombardment. In combination with vanadium and other rare earths, dysprosium has been used in making laser materials. Dysprosium-cadmium chalcogenides, as sources of infrared radiation, have been used for studying chemical reactions.
Isotopes in Industry
The isotopes of dysprosium are highly magnetic and have been the subject of physics research involving interactions of isotopes and the structure of lattice supersolids (spatially ordered material with superfluid properties, i.e. zero viscosity). The Magneto-Optical Trapping (MOT) chamber is used for slowing atoms (isotopes) to study the physics of neutral atoms by using a laser light to cool atoms (“Doppler cooling”) and magnetic quadrupole fields to slow and “trap” the neutral atoms (Fig. IUPAC.66.1) [462] S. H. Youn, M. Lu, U. Ray, B. L. Lev. Am. Phys. Soc. Phys. Rev. A.82, 043425 (2010). https://doi.org/10.1103/PhysRevA.82.043425., [463] C. M. Elliott. First Dysprosium MOT, Physics Illinois-University of Illinois at Urbana-Champaign (2017), Feb. 28; http://engineering.illinois.edu/news/article/2009-07-31-first-dysprosium-mot..
164Dy has a large neutron absorption cross section, so dysprosium is used for control rods [464] V. E. Ceron, J. G. Hirsch. Phys. Lett. B471, 1 (1999).. 161Dy has been a key isotope for studying the Mössbauer Effect, which is the resonance and absorption of gamma ray emissions on nearby atoms in a solid state [465] R. L. Cohen. Phys. Rev.137, 1809 (1965)..
Isotopes in Medicine
165Dy (with a half-life of 140 min) is commonly used in arthritis therapy (radiosynovectomy). Rheumatic inflammation of the membranes of joints is often treated by the injection of 165Dy-ferric oxide directly into the joint space of the knee. Leakage from the joint has been shown to be minimal [467] C. B. Sledge, J. D. Zuckerman, M. R. Zalutsky, R. W. Atcher, S. Shortkroff, D. R. Lionberger, H. A. Rose, B. J. Hurson, P. A. Lankenner, R. J. Anderson, W. A. Bloomer. Arthritis Rheum.29, 153 (1986)..
Isotopes Used as a Source of Radioactive Isotope(s)
164Dy is used to produce 166Dy (with a half-life of 3.4 days) via double neutron capture [468] D. Ma, A. R. Ketring, G. J. Ehrhardt, W. Jia. J. Radioanal. Nucl. Chem.206, 119 (1996)., [469] S. Mirzadeh, R. E. Schenter, A. P. Callahan, F. F. Knapp. Production Capabilities in U.S. Nuclear Reactors for Medical Radioisotopes, Tm-12010, Oak Ridge National Laboratory Oak Ridge, Tenn (1992)., [470] S. Lahiri, K. J. Volkers, B. Wierczinski. Appl. Radiat. Isot.61, 1157 (2004).. 166Dy, which decays to 166Ho, is used in cancer and arthritis therapy [468] D. Ma, A. R. Ketring, G. J. Ehrhardt, W. Jia. J. Radioanal. Nucl. Chem.206, 119 (1996)., [471] G. Ferro-Flores, O. Hernandez-Oviedo, C. Arteaga de Murphy, J. I. Tendilla, F. Monroy-Guzman, M. Pedraza-Lopez, K. Aldama-Alvarado. Appl. Radiat. Isot.61, 1227 (2004)..
Dysprosium chemistry is dominated by the +3 oxidation state, represented by dysprosium(III) oxide, Dy₂O₃, dysprosium(III) chloride, DyCl₃, and many hydrated salts. The Dy³⁺ ion is strongly paramagnetic because of its 4f electrons, which are shielded enough to give sharp optical transitions in some host crystals. Dysprosium(II) compounds are uncommon and require strongly reducing conditions; +4 chemistry is not a normal feature of dysprosium. Many minerals contain dysprosium only as a minor component substituting for other heavy rare earth ions.
See more information at the Dysprosium compound page.
Dysprosium metal dust and filings can burn, and the metal reacts slowly with moisture to form hydrogen, H₂, and hydroxides or oxides. Soluble dysprosium salts should be handled as toxicologically uncertain rare-earth compounds rather than as harmless materials; ingestion or inhalation of dust is undesirable. Natural dysprosium is not significantly radioactive, but activated dysprosium isotopes can present radiation hazards in nuclear settings.
Dysprosium occurs dispersed in minerals such as xenotime and ion-adsorption clays, where it substitutes for other trivalent rare earth elements. Weathering and processing can mobilize rare-earth ions, but dysprosium generally has low solubility in neutral to alkaline waters because it forms insoluble phosphates, carbonates, and hydroxides. It has no known biological function. Environmental concern is usually tied to mining, acid leaching, and waste management rather than to natural background concentrations.
Dysprosium is produced as a separated rare earth from mixed ores and concentrates, not from dedicated dysprosium minerals. The main industrial challenge is separation from chemically similar lanthanides by solvent extraction or ion-exchange processes. Demand is strongly linked to high-temperature permanent magnets, while supply is limited by the availability of heavy rare-earth feedstocks. Recycling from magnets is technically possible and increasingly important, but collection, separation, and alloy complexity limit recovery. Substitution strategies include reducing dysprosium content, using grain-boundary diffusion, or redesigning motors to need less coercivity.
Usually found with erbium, holmium and other rare earths in some minerals such as monazite sand, which is often 50% rare earth by weight.
Dysprosium is a rare cosmic element. Its stable isotopes are produced mainly by slow and rapid neutron-capture processes in evolved stars and explosive stellar environments, then incorporated into interstellar dust and later planetary materials. In the Solar System it is concentrated with other refractory rare earths in silicate and phosphate phases rather than in metallic cores or volatile reservoirs.
- The name dysprosium comes from a Greek word meaning “hard to get at,” reflecting its difficult separation from other lan
- Dysprosium has one of the highest thermal-neutron absorption cross sections among stable elements.
- A small dysprosium addition can greatly raise the coercivity of Nd₂Fe₁₄B-based magnets.
- The isotope ¹⁶⁴Dy is the most abundant naturally occurring dysprosium isotope.
- Dysprosium metal can be cut with ordinary tools, but fresh surfaces tarnish readily.
Images
Propriétés
Propriétés physiques
- Rayon atomique (empirique)
- 175 pm Comparer : Rayon atomique (empirique) de tous les éléments →
- Rayon covalent
- 192 pm Comparer : Rayon covalent de tous les éléments →
- Rayon de van der Waals
- 229 pm Comparer : Rayon de van der Waals de tous les éléments →
- Masse volumique
- 8550 kg/m³ Comparer : Masse volumique de tous les éléments →
- Volume molaire
- 0,019 L/mol
- Phase aux CNTP
- Solide Comparer : Phase aux CNTP de tous les éléments →
- Point de fusion
- 1411,85 °C Comparer : Point de fusion de tous les éléments →
- Point d’ébullition
- 2566,85 °C Comparer : Point d’ébullition de tous les éléments →
- Conductivité thermique
- 10,7 W/(m·K) Comparer : Conductivité thermique de tous les éléments →
- Capacité thermique massique
- 0,173 J/(g·K) Comparer : Capacité thermique massique de tous les éléments →
- Capacité thermique molaire
- 28,16 J/(mol·K) Comparer : Capacité thermique molaire de tous les éléments →
- Structure cristalline
- Hexagonal compact Comparer : Structure cristalline de tous les éléments →
Propriétés chimiques
- Électronégativité (Pauling)
- 1,22 Comparer : Électronégativité (Pauling) de tous les éléments →
- Affinité électronique
- 0,352 eV
- Énergie d’ionisation (1re)
- 5,939061 eV Comparer : Énergie d’ionisation (1re) de tous les éléments →
- Énergie d’ionisation (2e)
- 11,64704 eV Comparer : Énergie d’ionisation (2e) de tous les éléments →
- Énergie d’ionisation (3e)
- 22,890079 eV Comparer : Énergie d’ionisation (3e) de tous les éléments →
- Énergie d’ionisation (4e)
- 41,230142 eV Comparer : Énergie d’ionisation (4e) de tous les éléments →
- Énergie d’ionisation (5e)
- 62,100214 eV Comparer : Énergie d’ionisation (5e) de tous les éléments →
- États d’oxydation
- 0, +1, +2, +3, +4 Comparer : États d’oxydation de tous les éléments →
- Électrons de valence
- 3 Comparer : Électrons de valence de tous les éléments →
- Configuration électronique
- [Xe] 6s2 4f10
Propriétés thermodynamiques
- Enthalpie de fusion
- 0,11504379 eV Comparer : Enthalpie de fusion de tous les éléments →
- Enthalpie de vaporisation
- 2,38379 eV Comparer : Enthalpie de vaporisation de tous les éléments →
- Enthalpie de sublimation
- 3,016013 eV
- Enthalpie d’atomisation
- 3,016013 eV
- Enthalpie d’atomisation
- 3,009794 eV
Propriétés nucléaires
- Protons
- 66 Comparer : Protons de tous les éléments →
- Neutrons
- 98 Comparer : Neutrons de tous les éléments →
- Isotopes connus
- 39 Comparer : Isotopes connus de tous les éléments →
- Isotopes stables
- 6 Comparer : Isotopes stables de tous les éléments →
- Isotope le plus stable
- Dy-164
- Année de découverte
- 1878
Abondance
- Abondance (croûte terrestre)
- 5,2 mg/kg Comparer : Abondance (croûte terrestre) de tous les éléments →
- Abondance (océan)
- 9,1 × 10−7 mg/L Comparer : Abondance (océan) de tous les éléments →
Structure cristalline
- Paramètre de maille a
- 359 pm
Structure électronique
- Électrons par couche
- 2, 8, 18, 28, 8, 2 Comparer : Électrons par couche de tous les éléments →
Identifiants
- Numéro CAS
- 7429-91-6 Comparer : Numéro CAS de tous les éléments →
- Symbole de terme
- 5I8
- InChI
- InChI=1S/Dy
- Clé InChI
- KBQHZAAAGSGFKK-UHFFFAOYSA-N
Configuration électronique Mesuré
Dy: 4f¹⁰ 6s²[Xe] 4f¹⁰ 6s²1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁰ 6s²Modèle atomique
Les isotopes diffèrent par leur nombre de neutrons, leur masse et leur stabilité — pas par la configuration électronique de l’atome neutre.
Modèle atomique schématique, non à l’échelle.
Empreinte atomique
Spectre d’émission / d’absorption
Distribution isotopique
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie |
|---|---|---|---|
| 158 Stable | 157,9244159 ± 0,0000031 | 0,0950% | Stable |
| 160 Stable | 159,9252046 ± 0,000002 | 2,3290% | Stable |
| 161 Stable | 160,9269405 ± 0,000002 | 18,8890% | Stable |
| 162 Stable | 161,9268056 ± 0,000002 | 25,4750% | Stable |
| 163 Stable | 162,9287383 ± 0,000002 | 24,8960% | Stable |
| 164 Stable | 163,9291819 ± 0,000002 | 28,2600% | Stable |
Phase / État
Explication: 1386,8 °C en dessous du point de fusion (1411,85 °C)
Schématique, non à l’échelle
Points de transition de phase
Énergies de transition
Énergie nécessaire pour faire fondre 1 mol au point de fusion
Énergie nécessaire pour vaporiser 1 mol au point d’ébullition
Énergie nécessaire pour sublimer 1 mol au point de sublimation
Masse volumique
Dans les conditions standard
Dans les conditions standard
Spectres atomiques
Affichage de 10 sur 66. Tri par charge ionique croissante.
Raies répertoriées ?
| Ion | Charge | Nombre total de raies | Probabilités de transition | Désignations des niveaux |
|---|---|---|---|---|
| Dy I | 0 | 230 | 73 | 73 |
| Dy II | +1 | 421 | 17 | 17 |
Niveaux répertoriés ?
| Ion | Charge | Niveaux |
|---|---|---|
| Dy I | 0 | 740 |
| Dy II | +1 | 576 |
| Dy III | +2 | 2 |
| Dy IV | +3 | 13 |
| Dy V | +4 | 2 |
| Dy VI | +5 | 2 |
| Dy VII | +6 | 2 |
| Dy VIII | +7 | 2 |
| Dy IX | +8 | 2 |
| Dy X | +9 | 2 |
Rayons ioniques
| Charge | Coordinence | Spin | Rayon |
|---|---|---|---|
| +2 | 6 | N/D | 107 pm |
| +2 | 7 | N/D | 112.99999999999999 pm |
| +2 | 8 | N/D | 119 pm |
| +3 | 6 | N/D | 91.2 pm |
| +3 | 7 | N/D | 97 pm |
| +3 | 8 | N/D | 102.69999999999999 pm |
| +3 | 9 | N/D | 108.3 pm |
Composés
Isotopes (6)
| Nombre de masse | Masse atomique (u) | Abondance naturelle | Demi-vie | Mode de désintégration | |
|---|---|---|---|---|---|
| 158 Stable | 157,9244159 ± 0,0000031 | 0,0950% ± 0,0030% | Stable | stable | |
| 160 Stable | 159,9252046 ± 0,000002 | 2,3290% ± 0,0180% | Stable | stable | |
| 161 Stable | 160,9269405 ± 0,000002 | 18,8890% ± 0,0420% | Stable | stable | |
| 162 Stable | 161,9268056 ± 0,000002 | 25,4750% ± 0,0360% | Stable | stable | |
| 163 Stable | 162,9287383 ± 0,000002 | 24,8960% ± 0,0420% | Stable | stable | |
| 164 Stable | 163,9291819 ± 0,000002 | 28,2600% ± 0,0540% | Stable | stable |
Propriétés étendues
Rayons covalents (données étendues)
- Rayon covalent (Pyykkö)
- 167 pm
- Rayon covalent (Pyykkö, liaison double)
- 133 pm
Rayons de van der Waals
- Alvarez
- 287 pm
- UFF
- 342,8 pm
- MM3
- 290 pm
Rayons atomiques et métalliques
- Rayon atomique (Rahm)
- 275 pm
Échelles de numérotation
- Mendeleev
- 31
- Pettifor
- 25
- Glawe
- 24
Échelles d’électronégativité
- Ghosh
- 0
- Miedema
- 3
- Gunnarsson–Lundqvist
- 5
- Robles–Bartolotti
- 4
Polarisabilité et dispersion
- Polarisabilité dipolaire
- 163 a.u.
- Polarisabilité dipolaire (incertitude)
- 15 a.u.
- C₆ (Gould–Bučko)
- 2430 Ha·Bohr6
Paramètres de Miedema
- Volume molaire de Miedema
- 19 cm3/mol
- Densité électronique de Miedema
- 2
Risque d’approvisionnement et économie
- Concentration de la production
- 97
- Risque relatif d’approvisionnement
- 10
- Répartition des réserves
- 50
- Stabilité politique (principal producteur)
- 24
- Stabilité politique (principal détenteur de réserves)
- 24
Transitions de phase et allotropes
| Point de fusion | 1685,15 K |
| Point d’ébullition | 2840,15 K |
Catégories d’états d’oxydation
Données de référence avancées
Constantes d’écran (13)
| n | Orbitale | σ |
|---|---|---|
| 1 | s | 1,2914 |
| 2 | p | 4,3204 |
| 2 | s | 17,2906 |
| 3 | d | 13,6701 |
| 3 | p | 20,1195 |
| 3 | s | 20,6067 |
| 4 | d | 34,982 |
| 4 | f | 39,464 |
| 4 | p | 32,174 |
| 4 | s | 31,408 |
Détail des rayons cristallins (7)
| Charge | CN | Spin | rcrystal (pm) | Origine |
|---|---|---|---|---|
| 2 | VI | 121 | ||
| 2 | VII | 127 | ||
| 2 | VIII | 133 | ||
| 3 | VI | 105,2 | from r^3 vs V plots, | |
| 3 | VII | 111 | ||
| 3 | VIII | 116,7 | from r^3 vs V plots, | |
| 3 | IX | 122,3 | from r^3 vs V plots, |
Modes de désintégration des isotopes (56)
| Isotope | Mode | Intensité |
|---|---|---|
| 138 | B+ | — |
| 138 | B+p | — |
| 139 | B+ | 100% |
| 139 | B+p | 11% |
| 140 | B+ | — |
| 140 | B+p | — |
| 141 | B+ | 100% |
| 141 | B+p | — |
| 142 | B+ | 100% |
| 142 | e+ | 90% |
Facteurs de diffusion des rayons X (514)
| Énergie (eV) | f₁ | f₂ |
|---|---|---|
| 10 | — | 0,15635 |
| 10,1617 | — | 0,1621 |
| 10,3261 | — | 0,16806 |
| 10,4931 | — | 0,17425 |
| 10,6628 | — | 0,18066 |
| 10,8353 | — | 0,18731 |
| 11,0106 | — | 0,19421 |
| 11,1886 | — | 0,20135 |
| 11,3696 | — | 0,20876 |
| 11,5535 | — | 0,21654 |
Données complémentaires
Estimated Crustal Abundance
The estimated element abundance in the earth's crust.
5.2 milligrams per kilogram
Références (1)
- [5] Dysprosium https://education.jlab.org/itselemental/ele066.html
Estimated Oceanic Abundance
The estimated element abundance in the earth's oceans.
9.1×10-7 milligrams per liter
Références (1)
- [5] Dysprosium https://education.jlab.org/itselemental/ele066.html
Références
(9)
Data deposited in or computed by PubChem
The half-life and atomic mass data was provided by the Atomic Mass Data Center at the International Atomic Energy Agency.
Element data are cited from the Atomic weights of the elements (an IUPAC Technical Report). The IUPAC periodic table of elements can be found at https://iupac.org/what-we-do/periodic-table-of-elements/. Additional information can be found within IUPAC publication doi:10.1515/pac-2015-0703 Copyright © 2020 International Union of Pure and Applied Chemistry.
The information are cited from Pure Appl. Chem. 2018; 90(12): 1833-2092, https://doi.org/10.1515/pac-2015-0703.
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The periodic table at the LANL (Los Alamos National Laboratory) contains basic element information together with the history, source, properties, use, handling and more. The provenance data may be found from the link under the source name.
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This section provides all form of data related to element Dysprosium.
The element property data was retrieved from publications.