Material	Bismuth telluride
	Bismuth telluride is a thermoelectric compoud of tellurium and bismuth. Thermoelectric materials are those which exhibit a Peltier effect (see glossary). It is a semiconductor, usually doped both positively (deficency of electrons) and negatively (excess of electrons) for increasing its thermoelectric power. Since its thermoelectric power is remarkable especially between -10 and 130 C, the material suits most thermoelectric cooling applications.
Category	Ceramics, Technical ceramics
Products	Can cooler Food plate Lorry refrigerator Hotel minibar
Similar materials	Thermoelectric materials Bismuth Tellurium
References	Johnson Matthey GmbH SupercoolTM International Thermoelectric Inc.
Price	Very pure powder purchased in small amounts (less than 1kg) are very expensive. Prices vary from 5,000 to 10,000 DKK/kg, according to the quantities. Supposedly, for larger order the price can be lower.
Photo	Thomas Nissen (Computer graphics)
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