The Enthalpy of Formation of Hexagonal Boron Nitride

• Autorzy: Tomaszkiewicz, I.
• Języki publikacji: EN

Abstrakty

EN

The energies of combustion in fluorine of three specimens of hexagonal boron nitride with different degree of ideal crystalline structure have been measured in a twocompartment calorimetric bomb at 298.15 K according to reaction: BN(cr) + 3/2F2(g) = BF3(g) + 1/2N2(g), and new standard molar enthalpies of formation f m H0 have been calculated and used to rank the samples in order of stability: f m H0 = -(245.8š1.1) kJ/mol for turbostratic sample, that deviates most from the crystalline structure; f m H0 = -(248.5š0.9) kJ/mol for the sample with an interlayer spacing that is only about 0.5% larger than the ideal crystalline h-BN; and f m H0 = -(250.8š1.2) kJ/mol for crystalline h-BN.

Słowa kluczowe

EN

standard molar enthalpy of formation; hexagonal boron nitride; pyrolitic boron nitride

• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2002
• Tom: Vol. 76 / nr 6
• Strony: 891-899
• Opis fizyczny: Bibliogr. 22 poz., rys.

Twórcy

autor

Tomaszkiewicz, I.

• Chemical and Physical Properties Division, National Institute of Standards and Technology, Gaithersburg , Maryland 20899, U.S.A. Institute of Physical Chemistry of the Polish Academy of Sciences, Kasprzaka 44, 012-224 Warsaw, Poland,

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