Determination of standard gibbs energies of formation of MgO,SrO, and BaO期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Determination of standard gibbs energies of formation of MgO,SrO, and BaO

Authors:

Hideki Ono Masaya Nakahata Fumitaka Tsukihashi Nobuo Sano

Affiliation:

1. Department of Metallurgy, The University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan
2. Information Engineering Course, The University of Tokyo, Bunkyo-ku, 113, Tokyo, Japan

Abstract:

The standard Gibbs energy of formation of MgO was determined from the measurement of the ΔG° for the reaction $Mg(1) + \underline O (in Nb) = MgO$ ; by equilibrating Mg and Nb with a magnesia crucible and is expressed as follows: Mg(l)+ l/2O₂(g) = MgO(s) ΔG° = −657,000(±5000) + 141(±13)T J/mol] (973 to 1323 K) The standard Gibbs energies of formation of SrO and BaO were determined by equilibrating silver and MO(M: Sr, and Ba) in a graphite crucible on the basis of the reactionM(in Ag) + CO (g) = MO (s) + C (s), yielding the following results:

$\begin{gathered} Sr(1) + 1/20_2 (g) = SrO (s) \hfill \\ \Delta G^ \circ = - 645,000( \pm 3000) + 133( \pm 7)TJ/mol] (1373 to 1773 K) \hfill \\ Ba(1) + 1/20_2 (g) = BaO (s) \hfill \\ \Delta G^ \circ = - 610,000( \pm 2000) + 137( \pm 6)TJ/mol] (1373 to 1673 K) \hfill \\ \end{gathered}$

Keywords:
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