| Identification | More | [Name]
HOLMIUM | [CAS]
7440-60-0 | [Synonyms]
Ho
VRBD
HOLMIUM
HO006010
HO000220
HO007905
HO000205
HO000215
HO007910
HO000210
HO000221
HO005105
HO000200
HO005110
Holmium-165
ingot,99.9%
holmium atom
Holmium Foil
HOLMIUM, LUMP
HOLMIUM METAL
Holmium, Chips
Holmium Powder
Holmium Pieces
Holmium, ingot
HOLMIUM, 99.9%
HOLIUM STANDARD
HOLMIUM STANDARD
HolmiumchipsNREO
HolmiumingotNREO
Holmium solution
Holmium, Chips 99%
TIANFU-CHEM HOLMIUM
HOLMIUM ICP STANDARD
Ho Standard Solution
HOLMIUM, CHIP, 99.9%
HOLMIUM, INGOT, 99.9%
HolmiumpowderNREOmesh
HOLMIUM: 99.9%, INGOT
Holmium, chips, 99.9%
Holmium pieces, 99.9%
HOLMIUM, 99.90%, INGOT
Holmium, ingot, 99.90%
Holmiumpowder(99.9%REO)
Holmium chips (99% REO)
Holmium, Powder 40 Mesh
Holmium foil (99.9% REO)
Holmium ingot (99.9% REO)
HolMiuM / HolMiuM Standard
Ultra Thin Holmium Nanofoil
HOLMIUM ISO 9001：2015 REACH
HolmiumfoilNREOmmthickcagxmm
Holmium, Powder 40 Mesh 99.9%
HOLMIUM, AAS STANDARD SOLUTION
HOLMIUM SINGLE ELEMENT STANDARD
HOLMIUM PLASMA EMISSION STANDARD
Holmium powder, -200 mesh, 99.9%
HOLMIUM, PLASMA STANDARD SOLUTION
HOLMIUM ATOMIC ABSORPTION STANDARD
Holmium pieces, Distilled dendritic
Holmium foil, 0.3mm (0.01 in.) thick
Holmium foil, 1.0mm (0.04 in.) thick
HolMiuM powder, -200 Mesh, 99.9% (REO)
Holmium foil, 0.62mm (0.024 in.) thick
Holmium powder, -325 mesh, 99.9% (REO)
HOLMIUM ABUNDANCE SENSITIVITY TEST MIX
Holmium rod, &ap:6.35mm (0.25 in.) dia.
Holmium foil, 0.025mm (0.001 in.) thick
HOLMIUM WAVELENGTH CALIBRATION STANDARD
HOLMIUM ICP STANDARD TRACEABLE TO SRM FR
Holmium, pieces or lumps, 10-30 mm, 99.9%
HOLMIUM ATOMIC ABSORPTION STANDARD SOLUTION
Holmium, AAS standard solution, Ho 1000μg/mL
HOLMIUM PLASMA EMISSION SPECTROSCOPY STANDARD
Holmium, plasma standard solution, Ho 10μg/mL
Holmium plasma standard solution, Ho 1000μg/mL
Holmium plasma standard solution, Ho 10000μg/mL
Holmium pieces, 99.9% (metals basis excluding Ta)
Holmium foil, 0.127mm (0.005in) thick, 99.9% (REO)
Holmium, plasma standard solution, Specpure, Ho 10g/ml
Holmium, AAS standard solution, Specpure(R), Ho 1000μg/ml
Holmium, plasma standard solution, Specpure(R), Ho 1000μg/ml
Holmium, plasma standard solution, Specpure(R), Ho 10,000μg/ml
Holmium powder, -325 mesh, 99.9% trace rare earth metals basis | [EINECS(EC#)]
231-169-0 | [Molecular Formula]
Ho | [MDL Number]
MFCD00011049 | [Molecular Weight]
164.93 | [MOL File]
7440-60-0.mol |
| Chemical Properties | Back Directory | [Definition]
Metallic element of atomic number 67, group IIIB of the periodic table, one of the rare-earth elements of the yttrium subgroup, aw 164.9303, valence of 3, no stable isotopes. | [Appearance]
grey metal ingot | [Melting point ]
1474 °C
| [Boiling point ]
2695 °C
| [density ]
8.8 g/mL at 25 °C(lit.)
| [solubility ]
soluble in dilute acid solutions | [form ]
ingot
| [color ]
Silver-gray | [Specific Gravity]
8.795 | [Water Solubility ]
reacts slowly with H2O, soluble dilute acids [HAW93] | [Sensitive ]
Air & Moisture Sensitive | [Merck ]
13,4747 | [Exposure limits]
ACGIH: TWA 2 ppm; STEL 4 ppm
OSHA: TWA 2 ppm(5 mg/m3)
NIOSH: IDLH 25 ppm; TWA 2 ppm(5 mg/m3); STEL 4 ppm(10 mg/m3) | [History]
The spectral absorption bands of holmium were noticed in 1878 by the Swiss chemists Delafontaine and Soret, who announced the existence of an “Element X.” Cleve, of Sweden, later independently discovered the element while working on erbia earth. Holmium is named after Cleve’s native city. Pure holmia, the yellow oxide, was prepared by Homberg in 1911. Holmium occurs in gadolinite, monazite, and in other rare-earth minerals. It is commercially obtained from monazite, occurring in that mineral to the extent of about 0.05%. It has been isolated by the reduction of its anhydrous chloride or fluoride with calcium metal. Pure holmium has a metallicto bright silver luster. It is relatively soft and malleable, and is stable in dry air at room temperature, but rapidly oxidizes in moist air and at elevated temperatures. Holmium has unusual magnetic properties. Few uses have yet been found for the element. The element, as with other rare earths, seems to have a low acute toxic rating. Natural holmium consists of one isotope 165Ho, which is not radioactive. Holmium has 49 other isotopes known, all of which are radioactive. The price of 99.9% holmium metal is about $20/g. | [Uses]
Getter in vacuum tubes, research in electrochemistry, spectroscopy. | [CAS DataBase Reference]
7440-60-0(CAS DataBase Reference) | [EPA Substance Registry System]
Holmium (7440-60-0) |
| Hazard Information | Back Directory | [Chemical Properties]
grey metal ingot | [Physical properties]
Holmium is a crystal-like, solid rare-earth with a metallic luster. It is one of the more scarceelements of the lanthanide series. It is soft, like lead, and can be hammered and pounded intothin sheets.
Its melting point is 1,474°C, its boiling point is 2,700°C, and its density is 8.79g/cm3. | [Isotopes]
There are a total of 57 isotopes of holmium. Only one of these, Ho-165, is stable,and it is the only isotope found in the Earth’s crust. All the other 56 isotopes havehalf-lives of a few milliseconds to 1.20×10+3 years, the half-life of Ho-166. | [Origin of Name]
Derived from the Latin word for the ancient city named Holmia (present-
day Stockholm, located in Sweden). | [Occurrence]
Holmium is the 12th most abundant of the rare-earths found in the Earth’s crust. Althoughit is the 50th most abundant element on Earth, it is one of the least abundant lanthanide metals.It is found in gadolinite and the monazite sands of South Africa and Australia and in thebeach sands of Florida and the Carolinas in the United States. Monazite sand contains about a50% mixture of the rare-earths, but only 0.05% by weight is holmium. Today, small quantitiesof holmium are produced by the ion-exchange process. | [Characteristics]
Although stable at room temperatures, holmium will corrode at higher temperatures andhumidity. Its oxide coating is a yellowish film that reacts slowly with water and dissolves inweak acids. Holmium has one of the highest magnetic properties of any substance, but it haslittle commercial use. | [Production Methods]
Holmium is obtained from monazite, bastnasite and other rare-earth minerals as a by-product during recovery of dysprosium, thulium and other rareearth metals. The recovery steps in production of all lanthanide elements arevery similar. These involve breaking up ores by treatment with hot concentrated sulfuric acid or by caustic fusion; separation of rare-earths by ionexchange processes; conversion to halide salts; and reduction of the halide(s)to metal (See Dysprosium, Gadolinium and Erbium).
Bulk holmium metal is prepared by reduction of holmium chloride or fluo-ride by sodium, calcium, or magnesium in a tantalum crucible under argonatmosphere:
2HoF3 + 3Ca → 3CaF2 + 2Ho
Pure holmium metal is obtained by distillation of crude metal at 1,500°C.
| [General Description]
Holmium Wavelength Calibration Standard is a high-quality secondary reference standard offered as a suitable alternative to NBS Holmium Oxide Solution (No. 2034). It is used to establish the accuracy of conventional spectrophotometers in the spectral range 240 to 650 nm. The product consists of Holmium perchlorate (15% w/v) in 10% perchloric acid. | [Hazard]
Because holmium is produced in such very small amounts, it is not a potential hazard tothe general public. However, professional chemists take the same precautions as they do withother rare-earths. |
| Safety Data | Back Directory | [Hazard Codes ]
C | [Risk Statements ]
R34:Causes burns. | [Safety Statements ]
S22:Do not breathe dust .
S24/25:Avoid contact with skin and eyes .
S36:Wear suitable protective clothing .
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S23:Do not breathe gas/fumes/vapor/spray (appropriate wording to be specified by the manufacturer) . | [RIDADR ]
UN 3089 4.1/PG 2
| [WGK Germany ]
3
| [F ]
1-10 | [TSCA ]
Yes | [HazardClass ]
4.1 | [PackingGroup ]
II | [HS Code ]
28053090 |
| Questions and Answers (Q&A) | Back Directory | [Description]
Holmium has the highest magnetic moment (10.6uB) of any naturally occurring element. Because of this it has been used to create the highest known magnetic fields by placing it within high strength magnets as a pole piece or magnetic flux concentrator.
This magnetic property also has value in Yttrium-Iron-Garnet (YIG) lasers for microwave equipment.
Holmium lasers emit at a human eye safe 2.08 microns allowing its use in a variety of medical and dental applications in both Yttrium-Aluminum-Garnet (YAG) and Yttrium-Lanthanum-Fluoride (YLF) solid state lasers. The wavelength allows for use in silica fibers designed for shorter wavelengths while still providing the cutting strength of longer wave length equipment.
Holmium is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.
Holmium Metal, is mainly used for making speciality alloys and superconductive materials. Holmium is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.
|
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| Company Name: |
Alfa Aesar
|
| Tel: |
400-6106006 |
| Website: |
http://chemicals.thermofisher.cn |
| Company Name: |
Energy Chemical
|
| Tel: |
021-021-58432009 400-005-6266 |
| Website: |
http://www.energy-chemical.com |
|