Tin telluride wavelength range. The alloyed material has been used in mid- IR photodetectors and thermoelectric generator. Tin telluride Tin telluride is a compound of tin and tellurium (SnTe); is a IV-VI narrow band gap semiconductor and has direct band gap of 0.18 eV. It is often alloyed with lead to make lead tin telluride, which is used as an infrared detector material. Tin telluride normally forms p-type semiconductor (Extrinsic semiconductor) due to tin vacancies and is a low temperature superconductor. SnTe exists in 3 crystal phases. At Low temperatures, where the concentration of hole carriers is less than 1.5x10 cm ,
Christmas gift (exclamation) also in southern Pennsylvania, Ohio Valley, West Virginia, and later in northeastern Texas as a simple greeting and recognizing the birth of Christ as a gift. A variant of the tradition is "Christmas Eve gift". The tradition is similar to the "Christmas gift" tradition, but occurs on Christmas Eve. The person being told "Christmas Eve gift!" is expected to present the person saying it to them with a small present, traditionally candy or nuts. The Dictionary of American Regional English traces the first written uses of this version to 1954. Christmas gift (exclamation) "Christmas gift" is an exclamation traced back