| Autor: |
Jangg, Gerhard, Weihs, Gerald |
| Zdroj: |
Chemical Monthly / Monatshefte für Chemie; 1975, Vol. 106 Issue 5, p1149-1154, 6p |
| Abstrakt: |
Vapour pressure measurements in the system Ca−Hg (0-50 at% Ca) at temperatures between 250 and 500° C confirmed the existence of the phases CaHg, CaHg, CaHg, and CaHg. Further phases do not exist in the examined range. CaHg crystallizes with stoichiometric composition without any homogeneity range, but CaHg and CaHg have small (0.2 and 0.8 at% resp.) homogeneity ranges. The examinations confirm the peritectic decomposition of CaHg (263 °C) and the stability of CaHg, CaHg and CaHg up to temperatures above 500 °C. The 'heats of reaction' of the Hg-rich Ca−Hg-compounds formed from CaHg and Hg, as calculated from vapour pressure measurements are relatively small. Further experiments proved that Hg is not soluble in Ca at least at a temperature of 450 °C. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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