Terbium(III) chloride
Chemical compound
From Wikipedia, the free encyclopedia
Terbium(III) chloride (TbCl3) is a chemical compound. In the solid state TbCl3 has the YCl3 layer structure.[2] Terbium(III) chloride frequently forms a hexahydrate.
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| Names | |||
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| Other names
terbium trichloride | |||
| Identifiers | |||
3D model (JSmol) |
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| ChemSpider | |||
| ECHA InfoCard | 100.030.108 | ||
| EC Number |
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PubChem CID |
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| UNII | |||
CompTox Dashboard (EPA) |
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| Properties | |||
| TbCl3 | |||
| Molar mass | 265.2834 g/mol | ||
| Appearance | white powder | ||
| Density | 4.35 g/cm3, solid | ||
| Melting point | 558 °C (1,036 °F; 831 K) | ||
| Boiling point | 180 to 200 °C (356 to 392 °F; 453 to 473 K) (in HCl gas atmosphere) | ||
| soluble | |||
| Structure | |||
| hexagonal (UCl3 type), hP8 | |||
| P63/m, No. 176 | |||
| Tricapped trigonal prismatic (nine-coordinate) | |||
| Hazards | |||
| GHS labelling:[1] | |||
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| Warning | |||
| H315, H319 | |||
| P302+P352, P305+P351+P338 | |||
| Related compounds | |||
Other anions |
Terbium(III) oxide | ||
Other cations |
Gadolinium(III) chloride Dysprosium(III) chloride | ||
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Preparation
The hexahydrate of terbium(III) chloride can be obtained by the reaction of terbium(III) oxide and hydrochloric acid:[3]
- Tb2O3 + 6 HCl → 2 TbCl3 + 3 H2O
It can also be obtained by direct reaction of the elements:[4]
- 2 Tb + 3 Cl2 → 2 TbCl3
Properties
Terbium(III) chloride is a white, hygroscopic powder.[5] It crystallizes in an orthorhombic plutonium(III) bromide crystal structure with space group Cmcm (No. 63).[6][7] It can form a complex Tb(gly)3Cl3·3H2O with glycine.[8]
Applications
The hexahydrate plays an important role as an activator of green phosphors in color TV tubes and is also used in specialty lasers and as a dopant in solid-state devices.[9]