Strontium hexaboride

Strontium boride
Names
	Other names strontium hexaboride
Identifiers
CAS Number	12046-54-7 ;
3D model (JSmol)	Interactive image;
ECHA InfoCard	100.031.778
EC Number	234-969-8;
PubChem CID	6336904;
CompTox Dashboard (EPA)	DTXSID60894982 ;
	InChI InChI=1S/6B.Sr;
	SMILES [B].[B].[B].[B].[B].[B].[Sr];
Properties
Chemical formula	SrB6
Molar mass	152.49 g/mol
Appearance	black crystalline powder
Density	3.39 g/cm3, solid (15.0°C)
Melting point	2,235 °C (4,055 °F; 2,508 K)
Solubility in water	insoluble
Structure
Crystal structure	Cubic
Space group	Pm3m ; Oh
Hazards
EU classification (DSD) (outdated)	not listed
NFPA 704 (fire diamond)	0 1 0
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
	verify (what is ?)
	Infobox references

Strontium boride (Sr B₆) is an inorganic compound. At room temperature, it appears as a crystalline black powder.[1] Closer examination reveals slightly translucent dark red crystals capable of scratching quartz.[2] It is very stable and has a high melting point and density. Although not thought to be toxic, it is an irritant to the skin, eyes, and respiratory tract.[1]

Magnetism

Strontium boride, along with other alkali-earth metal borides, has been shown to exhibit weak ferromagnetism at low temperatures.[3] This is thought by some to be caused by slight impurities or aberrations in the crystal lattice,[4][5] while others suggest different explanations are needed.[6] Strontium boride has also been examined for semiconducting properties at lower temperatures.[7]

Preparation

In his book The Electric Furnace, Henri Moissan describes an early synthesis of strontium boride by mixing strontium borate, aluminum, and carbon in an electric furnace.[2] Alternatively, a solid-phase synthesis of strontium boride can be carried out by reacting two moles of strontium carbonate with three moles of boron carbide and one mole of carbon inside a vacuum furnace.[8]

Uses

Strontium boride is used in insulation and nuclear control rods.[8] A recent patent filed for aircraft windows uses SrB₆ nanoparticles in a transparent acrylic sheet. The IR-absorbing properties of these nanoparticles prevents the transmittance of infrared wavelengths while still allowing the transmittance of visible light.[9]

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References

http://www.espimetals.com/msds%27s/strontiumboride.pdf
Moissan, Henri. The Electric Furnace.
Young, D. P.; Hall, D.; Torelli, M. E.; Fisk, Z.; Sarrao, J. L.; Thompson, J. D.; Ott, H. R.; Oseroff, S. B.; Goodrich, R. G.; Zysler, R. (1999). "High-temperature weak ferromagnetism in a low-density free-electron gas". Nature. 397 (6718): 412–414. doi:10.1038/17081. PMID 29667965.
Shang, S.; Liu, Z. (2007). "Thermodynamics of the B–Ca, B–Sr, and B–Ba systems: Applications for the fabrications of CaB₆, SrB₆, and BaB₆ thin films". Applied Physics Letters. 90 (9): 091914. doi:10.1063/1.2710081.
Gavilano, J. L.; Ambrosini, B.; Ott, H. R.; Young, D. P.; Fisk, Z. (2000). "Low-temperature NMR studies of SrB₆". Physica B: Condensed Matter. 281: 428–429. doi:10.1016/S0921-4526(99)01197-7.
Dorneles, L.; Venkatesan, M.; Moliner, M.; Lunney, J.; Coey, J. (2004). "Magnetism in thin films of CaB₆ and SrB₆". Applied Physics Letters. 85 (26): 6377–6379. doi:10.1063/1.1840113. hdl:2262/31468.
Ott, H. R.; Chernikov, M.; Felder, E.; Degiorgi, L.; Moshopoulou, E. G.; Sarrao, J. L.; Fisk, Z. (1997). "Structure and low temperature properties of SrB₆". Z. Phys. B. 102 (3): 337–345. doi:10.1007/s002570050297.
Zheng, Shu-Qi; Zou, Zeng-Da; Min, Guang-Hui; Yu, Hua-Shun; Han, Jian-De; Wang, Wei-Ti. "Synthesis of strontium hexaboride powder by the reaction of strontium carbonate with boron carbide and carbon". Journal of Materials Science Letters. 2002 (21): 313–315.
"United States Patent Application 20090093578". Retrieved 2009-05-05.

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[msds-1] ttp://www.espimetals.com/msds%27s/strontiumboride.pdf

[furnace-2] Moissan, Henri. The Electric Furnace.

[3] Young, D. P.; Hall, D.; Torelli, M. E.; Fisk, Z.; Sarrao, J. L.; Thompson, J. D.; Ott, H. R.; Oseroff, S. B.; Goodrich, R. G.; Zysler, R. (1999). "High-temperature weak ferromagnetism in a low-density free-electron gas". Nature. 397 (6718): 412–414. doi:10.1038/17081. PMID 29667965.

[4] Shang, S.; Liu, Z. (2007). "Thermodynamics of the B–Ca, B–Sr, and B–Ba systems: Applications for the fabrications of CaB₆, SrB₆, and BaB₆ thin films". Applied Physics Letters. 90 (9): 091914. doi:10.1063/1.2710081.

[5] Gavilano, J. L.; Ambrosini, B.; Ott, H. R.; Young, D. P.; Fisk, Z. (2000). "Low-temperature NMR studies of SrB₆". Physica B: Condensed Matter. 281: 428–429. doi:10.1016/S0921-4526(99)01197-7.

[6] Dorneles, L.; Venkatesan, M.; Moliner, M.; Lunney, J.; Coey, J. (2004). "Magnetism in thin films of CaB₆ and SrB₆". Applied Physics Letters. 85 (26): 6377–6379. doi:10.1063/1.1840113. hdl:2262/31468.

[7] Ott, H. R.; Chernikov, M.; Felder, E.; Degiorgi, L.; Moshopoulou, E. G.; Sarrao, J. L.; Fisk, Z. (1997). "Structure and low temperature properties of SrB₆". Z. Phys. B. 102 (3): 337–345. doi:10.1007/s002570050297.

[reaction-8] Zheng, Shu-Qi; Zou, Zeng-Da; Min, Guang-Hui; Yu, Hua-Shun; Han, Jian-De; Wang, Wei-Ti. "Synthesis of strontium hexaboride powder by the reaction of strontium carbonate with boron carbide and carbon". Journal of Materials Science Letters. 2002 (21): 313–315.

[9] "United States Patent Application 20090093578". Retrieved 2009-05-05.