THE HIGH TEMPERATURE HEAT CONTENTS AND RELATED THERMODYNAMIC PROPERTIES OF LANTHANUM, PRASEODYMIUM, EUROPIUM, YTTERBIUM, AND YTTRIUM
The high temperature enthalpies of five rare earths were measured from 0 to 1100 deg C using a Bunsen ice calorimeter. The enthalpy of yttrium metal was studied from 1100 to 1675 deg C using a modified high temperature vacuum Bunsen calorimeter. The data were fitted to empirical equations from which the heat of transition and fusion, the heat capacity, and the related thermodynamic quantities were calculated. These results confirmed indications from other properties that europium and ytterbium metals are primarily in the divalert state. Small anomalies observed in europium and ytterbium were attributed to transitions between electronic states when some trivalent ions occur in these metals. The ertropy of the fcc-bcc transition for ytterbium was found to be approximately two- thirds that of the other rare-earth metals for which a close-packed to bodycertered cubic transformation was observed. (auth)
- Research Organization:
- Ames Lab., Ames, Iowa
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- W-7405-ENG-82
- NSA Number:
- NSA-17-004929
- OSTI ID:
- 4756513
- Report Number(s):
- IS-327
- Country of Publication:
- United States
- Language:
- English
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