Optical constants of liquid UO2 in the visible spectral range obtained from reflectivity measurements
Description
The optical constants, n,k, of liquid urania were determined from reflectivity measurements with plane-polarized light. Measurements were made with an integrating-sphere laser reflectometer in the wavelength range 450-750 nm at temperatures between 3000 and 4000 K. Consistent results have been obtained for different angles of incidence. The optical constants show little variation with the wavelength and temperature. Liquid urania proves to be opaque to radiation in the whole spectral range studied. Average values of n = 1.7 and k = 0.8 are given for the temperature range 3100-3600 K. From this result it is concluded that internal thermal radiation cannot cause a significant increase in thermal conductivity urania upon melting. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Die optischen Konstanten, n,k, von fluessigem UO2 wurden aus Reflexionsmessungen mit linear-polarisiertem Licht bestimmt. Die Messungen wurden mit einem integrierenden Laser-Kugelreflektometer in dem Wellenlaengenbereich 450-750 nm bei Temperaturen zwischen 3000 und 4000 K durchgefuehrt. Fuer verschiedene Reflexionswinkel ergaben sich konsistente Resultate. Die optischen Konstanten zeigen nur eine geringe Abhaengigkeit von der Wellenlaenge und von der Temperatur. Fluessiges UO2 erweist sich als opak in dem gesamten untersuchten Spektralbereich. Fuer den Temperaturbereich 3100-3600 K werden Mittelwerte von n = 1.7 und k = 0.8 angegeben. Aus diesem Ergebnis wird geschlossen, dass innere thermische Strahlung keinen wesentlichen Anstieg der Waermeleitfaehigkeit von UO2 beim Schmelzen verursachen kann. (orig.)
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Additional details
Publishing Information
- Imprint Pagination
- 32 p.
- Report number
- KFK--3201
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 13653163
- Subject category
- S36: MATERIALS SCIENCE;
- Descriptors DEI
- ABSORPTION SPECTRA; LIQUIDS; MELTING; OPTICAL PROPERTIES; POLARIZED BEAMS; REFLECTION; TEMPERATURE DEPENDENCE; THERMAL CONDUCTIVITY; URANIUM DIOXIDE; VERY HIGH TEMPERATURE; VISIBLE SPECTRA
- Descriptors DEC
- ACTINIDE COMPOUNDS; BEAMS; CHALCOGENIDES; FLUIDS; OXIDES; OXYGEN COMPOUNDS; PHASE TRANSFORMATIONS; PHYSICAL PROPERTIES; SPECTRA; THERMODYNAMIC PROPERTIES; URANIUM COMPOUNDS; URANIUM OXIDES
Optional Information
- Notes
- The topic of this report was presented at the 8. symposium on thermophysical properties, Gaithersburg, MD, 15-18 Jun 1981.