Thermal conversions of chitosanium dodecahydro-<Emphasis Type="Italic">closo</Emphasis>-dodecaborate |
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Authors: | V I Saldin L N Ignat’eva Yu M Nikolenko V M Buznik Yu M Mikhailov |
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Institution: | 1.Institute of Chemistry, Far East Branch,Russian Academy of Sciences,Vladivostok,Russia;2.Baikov Institute of Metallurgy and Materials Science,Russian Academy of Sciences,Moscow,Russia;3.Institute of Problems of Chemical Physics,Russian Academy of Sciences,Chernogolovka, Moscow oblast,Russia |
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Abstract: | The thermal behavior of chitosanium dodecahydro-closo-dodecaborate, (C6O4H9NH3)2B12H12, was studied by thermal analysis, X-ray diffraction, and IR and X-ray photoelectron spectroscopy. As this compound is heated
at a rate above 10–20 K/min, it ignites at a temperature of about 300°C. As the compound is heated to 1000°C at a rate below
10 K/min in an inert atmosphere, it yields a mixture of carbon and amorphous boron and/or boron carbides. The presence of
a small amount of boron oxide in the product is explained by the formation of a partially oxidized hydroborate anion at the
early stages of (C6O4H9NH3)2B12H12 decomposition via the interaction between oxygen of the chitosanium cation and the B12H122− anion. Heating the initial compound in air at a rate below 10 K/min yields carbon and boron oxide as the main products. Molten
boron oxide protects boron and/or boron carbides and boron nitride forming in small amounts in the particle bulk from oxidation. |
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