Partial Pressures of Strontium and Strontium Oxide over Strontium Oxide Heated on Platinum
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概要
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A quadrupole mass filter was used to determine the partial pressures of Sr(g) and SrO(g) over strontium oxide heated on a platinum-ribbon filament. The ion currents of <SUP>88</SUP>Sr<SUP>+</SUP> and <SUP>88</SUP>Sr<SUP>16</SUP>O<SUP>+</SUP> were measured while the filament temperature was continuously increasing at a heating rate of about 14°C/min; the calculations of the partial pressures were carried out by the integral method for Sr(g) and by the sensitivity-calibration method for SrO(g). The data are represented by:<BR>log<I>P</I><SUB>Sr(g)</SUB>(atm)=6.633−\frac2.536×10<SUP>4</SUP><I>T</I><BR>in the temperature range of 1643–1851°K, and by:<BR>log<I>P</I><SUB>SrO(g)</SUB>(atm)=6.707−\frac2.793×10<SUP>4</SUP><I>T</I><BR>in the 1747–1850°K range. From the values of the partial pressures, the dissociation energy of strontium oxide was determined to be <I>D</I><SUB>0</SUB><SUP>°</SUP>(SrO)=96.2±0.9 kcal/mol by the third-law treatment and <I>D</I><SUB>0</SUB><SUP>°</SUP>(SrO)=102±5 kcal/mol by the second-law treatment.
- 公益社団法人 日本化学会の論文
著者
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Asano Mitsuru
Institute Of Advanced Energy Kyoto University
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SASAKI Noriaki
Institute of Atomic Energy, Kyoto University
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YAMAMOTO Yutaka
Institute of Atomic Energy, Kyoto University
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KUBO Kenji
Institute of Atomic Energy, Kyoto University
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