12041-54-2Relevant articles and documents
Higashi, Iwami,Iwasaki, Hitoshi,Ito, Tetsuzo,Lundstroem, Torsten,Okada, Shigeru,Tergenius, Lars-Erik
, p. 230 - 238 (1989)
X-ray investigation of the Al-B-N ternary system: Isothermal section at 1500 °C: Crystal structure of the Al0.185B6CN0.256 compound
Rizzoli,Salamakha,Sologub,Bocelli
, p. 135 - 141 (2002)
The equilibrium phase diagram has been established using X-ray powder diffraction for the ternary Al-B-N system over the whole concentration region at 1500 °C. No ternary compounds have been observed. The crystal structure of the Al0.185B6CN0.256 compound (Cmcm space group, Z = 8, a = 5.685(2) A?, b = 8.903(3) A?, c = 9.122(3) A?, V = 461.70 A?3, ρ = 2.563 g/cm3, μ = 0.17 mm-1, R = 0.0424 for 407 reflections with Fo > 4σ(Fo)) was determined from single crystal X-ray diffraction (automatic diffractometer BRUKER AXS CCD, Mo Kα radiation) and electron microprobe analysis. The structure is related to the Al0.61B6.50, Al0.253B6.37C and Al0.325B6C structures.
Hoenigschmid, O.
, (1907)
Magnetization study of the ultra-hard material MgAlB14
Hill,Johnston,Cook,Harringa,Russell
, p. 23 - 32 (2003)
Magnetic susceptibility χ versus temperature T, magnetization M versus T, and isothermal M versus magnetic field H studies of the ultra-hard material MgAlB14 were carried out in search of superconductivity or ferromagnetism in this compound. Two types of samples were synthesized: (1) powder and (2) chemically substituted and unsubstituted hot pressed pellets prepared from mechanically alloyed powders. χ(T) measurements on a powder sample revealed temperature-independent diamagnetism with a Curie-Weiss impurity concentration equivalent to ～ 1mol% of spin-12 ions. In contrast, M(T) and M(H) data on the hot pressed samples, both substituted and unsubstituted, showed evidence of ferromagnetic transitions above ～ 330K. Scanning electron microscopy and Auger microprobe analysis of the hot pressed samples indicated that both substituted and unsubstituted samples contained significant concentrations of Fe impurities. We conclude that pure MgAlB 14 is neither a superconductor nor a ferromagnet above 1.8K and exhibits temperature-independent diamagnetism from 1.8K up to room temperature. The ferromagnetism observed in the hot pressed samples is likely due to Fe impurities abraded from the stainless steel mills used to mix the starting materials prior to hot pressing the samples.
