Strontium boride
| Crystal structure | ||||||||||||||||
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| __ Sr 2+ __ B | ||||||||||||||||
| General | ||||||||||||||||
| Surname | Strontium boride | |||||||||||||||
| other names |
Strontium hexaboride |
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| Ratio formula | SrB 6 | |||||||||||||||
| Brief description |
black, odorless solid |
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| properties | ||||||||||||||||
| Molar mass | 152.49 g mol −1 | |||||||||||||||
| Physical state |
firmly |
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| density |
3.39 g cm −3 |
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| Melting point |
2235 ° C |
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| solubility |
almost insoluble in water |
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| safety instructions | ||||||||||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||||||||
Strontium boride is a crystalline compound of the elements strontium and boron that appears dark red to black at room temperature . It is a very stable compound with a melting point of 2235 ° C, which is even able to scratch quartz.
presentation
Strontium boride can result from the reaction of strontium carbonate with boron carbide and elemental carbon in a vacuum furnace.
Alternatively, it can be by synthesis of strontium borate , aluminum represent and carbon in an electric furnace.
properties
The compound is non-toxic, but irritating, so contact with eyes, skin and respiratory system should be avoided.
Strontium boride, like some other alkaline earth metals, exhibits weak ferromagnetism at low temperatures . Sources have not yet come to a unified thesis, which is why there are two common ones. One assumption is that impurities or anomalies in the crystal structure are responsible for this.
The material also has semiconductor properties at low temperatures .
use
Strontium boride is used as an insulator and as a material for control rods .
Web links
- Panchatapa Jash, Alan W Nicholls, Rodney S Ruoff, Michael Trenary: Synthesis and characterization of single-crystal strontium hexaboride nanowires , in: Nano letters , 2008 , 8 (11), pp. 3794-3798; PMID 18950235 ; Abstract .
Individual evidence
- ↑ a b c d Safety data sheet Strontium Boride ( Memento of February 9, 2006 in the Internet Archive ) at Espimetals.
- ↑ a b c data sheet strontium boride from Sigma-Aldrich , accessed on June 13, 2011 ( PDF ).
- ^ A b Henri Moissan: The electrical furnace , Dodo Pr, 2007, ISBN 1-4067-8471-0 .
- ↑ a b Shu-Qi Zheng, Zeng-Da Zou, Guang-Hui Min, Hua-Shun Yu, Jian-De Han, Wei-Ti Wang: Synthesis of strontium hexaboride powder by the reaction of strontium carbonate with boron carbide and carbon , in: Journal of Materials Science Letters 2002 , 21 (4) , 313-315.
- ↑ L. Dorneles, M. Venkatesan, M. Moliner: Magnetism in thin films of CaB 6 and SrB 6 , in: Applied Physics Letters , 2004 , 85 , pp. 6377-6379; doi : 10.1063 / 1.1840113 .
- ↑ JL Gavilano, B. Ambrosini, HR Ott, DP Young, Z. Fisk: Low-temperature NMR studies of SrB 6 , in: Physica B: Condensed Matter , 2000 , 281-282 , pp. 428-429; doi : 10.1016 / S0921-4526 (99) 01197-7 .
- ↑ HR Ott, M. Chernikov, E. Felder, L. Degiorgi, EG Moshopoulou, JL Sarrao, Z. Fisk: Structure and low temperature properties of SrB 6 , in: Z. Phys. B , 1997 , 102 , 337-345; doi : 10.1007 / s002570050297 .