... ) TrademarkChemical compositionTe≥,% Impurities,≤ppmSi SeMgNiPbFeAlCdAgSnCuZnCaSumTe-05 99.999 1.0 1.0 0.5 0.5 0.4 0.2 ... 050.05 0.05 0.01 --0.01 0.1 0.1 1Te-07 99.99999 --0.01 0.005 ... , solar cell, thermoelectric converting elements, semiconductor refrigerator, gas sensor, temperature sensor, pressure sensor, photosensitizer, piezoelectric crystal, nuclear radiation probing and infrared detector ...