Online Resource
Institute of Organic Chemistry & Biochemistry
;
1983
In:
Collection of Czechoslovak Chemical Communications Vol. 48, No. 6 ( 1983), p. 1528-1531
In:
Collection of Czechoslovak Chemical Communications, Institute of Organic Chemistry & Biochemistry, Vol. 48, No. 6 ( 1983), p. 1528-1531
Abstract:
Mass spectrometric analysis of gaseous phase above Na 2 O.4 SiO 2 ; K 2 O.4 SiO 2 and Na 2 O.K 2 O.8 SiO 2 melts was used to identify the species observed and to determine their partial pressure values. The principal species observed were the corresponding alkaline species and oxygen. The temperature dependence of sodium and kalium partial pressures was established and corresponding vaporization enthalpy values were calculated by second law treatment of those vapor data. The average value of sodium vaporization enthalpy in binary melt amounts of Δ H T 0 = 315 ± 10 kJ mol -1 being in a good agreement with the data published previously. The vaporization enthalpy of potassium Δ H T 0 = 142 ± 8 kJ mol -1 is considerably lower with comparison to sodium and does not change if potassium evaporates from binary K 2 O.4 SiO 2 or ternary Na 2 O.K 2 O.8 SiO 2 melts respectively.
Type of Medium:
Online Resource
ISSN:
0010-0765
,
1212-6950
DOI:
10.1135/cccc19831528
Language:
English
Publisher:
Institute of Organic Chemistry & Biochemistry
Publication Date:
1983
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