Unveiling Tellurium: An Earthy Element
Tellurium is a fascinating chemical element, often described as a silvery-white or greyish-white metalloid. This means it possesses properties that are intermediate between those of metals and non-metals. It is quite rare, found less abundantly than gold on Earth, making it a valuable substance in various high-tech applications. When pure, tellurium can have a metallic lustre, but it is also brittle, similar to non-metals.
The Story of Its Discovery
The element Tellurium was first discovered in 1782 by Franz-Joseph Müller von Reichenstein, an Austrian mineralogist and the chief inspector of mines in Transylvania. He was investigating an ore that was thought to contain antimony. However, he observed that this ore did not behave as expected for antimony and deduced it contained a “new half-metal.” Later, in 1798, the German chemist Martin Heinrich Klaproth independently confirmed its discovery and named the element.
What’s in a Name?
The name “Tellurium” originates from the Latin word “tellus,” which means “Earth.” This name was chosen by Martin Heinrich Klaproth to reflect its origin from minerals found in the Earth’s crust, similar to how selenium (from Greek “selene” meaning Moon) was named.
Five Quick Facts About Tellurium
- Tellurium has the atomic number 52 in the periodic table and is represented by the symbol Te.
- It is known for its ability to form alloys with other metals, enhancing their strength and machinability. For instance, small amounts of tellurium are added to copper and steel to make them easier to cut and process in manufacturing facilities, which can be seen in various industrial applications across India.
- One of its most significant uses is in the production of cadmium telluride (CdTe) solar cells. These are a type of thin-film solar panel known for their efficiency and lower manufacturing costs, playing a role in India’s growing renewable energy sector.
- When a person has been exposed to tellurium, their breath, sweat, and urine can develop a peculiar garlic-like odour. This occurs because the body converts tellurium into dimethyl telluride.
- Tellurium is also used in infrared detectors and as a vulcanizing agent for rubber, which helps improve the durability and elasticity of rubber products.