Highly reproducible capacitance-low temperature and dissipation factor-low temperature curves were obtained for commercial solid tantalum electrolytic capacitors in the range 90-310 K. A description of a design of a cryostat used to test radial wire ended tantalum bead capacitors at low temperatures is given. The tantalum capacitors showed excellent capacitance-temperature linearity between 220 and 310 K for test frequencies of 120 Hz and 1 kHz. Some evidence is given for the presence of dielectric relaxation at approx 210 K.
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