High-speed (subsecond) measurement of heat capacity, electrical resistivity, and thermal radiation properties of niobium in the range 1500 to 2700 K

Abstract

Measurements of heal capacity, electrical resistivity, hemisphericaltotal emittance, and normal spectral emittance of niobium in thetemperature range 1500 In 2700 K by a subsecond duration pulse heatingtechnique are described. Results obtained on the above propertiesare reported and are compared with those in the literature. A sharpincrease in heat capacity above 2000 K was observed. Electrical resistivityshowed a negative departure from linearity in the curve of electricalresistivity against temperature. Estimated inaccuracy of measuredproperties is: 2 percent for heat capacity, 0.5 percent for electricalresistivity, and 3 percent for hemispherical total and normal spectralemittances.