Absolute calorimetric determination of dielectric loss factors at w = 104 s-1 and 4.2 k and application to the measurement of loss factors of standard capacitors at room temperature

By means of two different calorimetric methods the dielectric loss factors of a quartz and a mica capacitor were determined at 4.2 K. At w = 10⁴s^-1 the results are: tan δ_{quartz, 4.2 K} = (7.99 /spl I.chemo/ 0.05) × 10^-5 and tan δ_{mica, 4.2 K} = (2.23 /spl I.chemo/ 0.02) X 10^-6. Using these loss factor standards the loss factors of standard air capacitors at 23°C were determined.