Reference

Nitridation of calcium hexaboride

Nitridation of calcium hexaboride. Schwetz, K. A. (Elektroschmelzwerk Kempten G.m.b.H., Kempten, Ger.). NATO Adv. Study Inst. Ser., Ser. E, E23(Nitrogen Ceram.), 317-22 (English) 1977. CODEN: NASEDC. DOCUMENT TYPE: Journal CA Section: 69 (Thermodynamics, Thermochemistry, and Thermal Properties) Section cross-reference(s): 67 The exothermic nitridation of CaB6 [12007-99-7] to form BN [10043-11-5] at 900-2100°C was in conformity with thermodn. calcns. and expts. Addn. of H3BO3 (30%) [10043-35-3] aided the reaction.

Characteristics of the electronic structure and chemical bonding in rare earth metal hexaborides

Characteristics of the electronic structure and chemical bonding in rare earth metal hexaborides. Paderno, Yu. B.; Bessaraba, V.Several substances are used for example 12007-99-7 and 12008-02-5 which are their cas registry numbers. I.; Dudnik, E. M.; Ivanchenko, L. A. (Inst. Probl. Materialoved., Kiev, USSR). Tezisy Dokl. - Vses. Konf. Kristallokhim. Intermet. Soedin., 2nd, 147-8. Edited by: Rykhal, R. M. L'vov. Gos. Univ.: Lvov, USSR. (Russian) 1974. CODEN: 34CXAE. DOCUMENT TYPE: Conference CA Section: 65 (General Physical Chemistry) The theor. correlation between the valence of M in hexagonal MB6 and the cond. type was confirmed exptl. by the evidence from the measurements of elec. resistivity and the reflection spectra of thin films of the materials. The chem. bonding in trivalent and divalent hexaborides is of the ionic-covalent type, resp. .