Strontium hexaboride

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Strontium boride
Strontium boride
Names
Other names
strontium hexaboride
Identifiers
12046-54-7 YesY
EC Number 234-969-8
Jmol 3D model Interactive image
PubChem 6336904
Properties
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)
insoluble
Structure
Cubic
Pm3m ; Oh
Hazards
not listed
NFPA 704
Flammability code 0: Will not burn. E.g., water Health code 1: Exposure would cause irritation but only minor residual injury. E.g., turpentine Reactivity code 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g., liquid nitrogen Special hazards (white): no codeNFPA 704 four-colored diamond
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

Strontium boride (SrB6) 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[edit]

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[edit]

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[edit]

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]

References[edit]

  1. ^ a b http://www.espimetals.com/msds%27s/strontiumboride.pdf
  2. ^ a b 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: 412. doi:10.1038/17081. 
  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: 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: 6377–6379. doi:10.1063/1.1840113. 
  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: 337–345. 
  8. ^ a b 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.