THE COMPOUNDS DYMN2, HOMN2 AND ERMN2. CALCULATION OF THE ENERGY AND FREE ENTHALPY OF FORMATION OF RE-MERCURY-COMPOUNDS BY VAPOUR PRESSURE MEASUREMENTS AND THERMAL ANALYSIS,
Abstract
The systems Dy-, Ho, Er-Mn was investigated by the amalgam process. The structures and lattice spacings of the compounds DyMn2, HoMn2 and ErMn2 are reported. By vapour pressure measurements of the amalgams in dependence on temperature and composition the heat of formation, the entropy of formation and the free enthalpy of the compounds REHg, REHg2 and REHg3 (RE = Y, Sm) were evaluated. A highly sensitive apparatus was developed for the thermal and differential-thermal analysis of small samples of RE-Mn alloys up to 1500 C. By using this apparatus with the RE-amalgams the heats of formation were proved. The exact temperatures of decomposition of the compounds SmHg, SmHg2 and SmHg3 in dependence on pressure were measured. The compound SmHg4 was established by differential-thermal analysis and by X-ray investigations. It decomposes below the boiling point of mercury in SmHg3 and liquid mercury. From these data phase diagrams at 5 mm Hg and 750 mm Hg of the system Sm-Hg (which is representative for all RE-Hg diagrams) were constructed.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 30, 1964
- Accession Number
- AD0614463
Entities
People
- F. Lihl