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A compound semiconductor is a semiconductor compound composed of chemical elements of at least two different species. These semiconductors form for example in periodic table groups 13–15 (old groups III–V), for example of elements from the Boron group (old group III, boron, aluminium, gallium, indium) and from group 15 (old group V, nitrogen, phosphorus, arsenic, antimony, bismuth).
Non-metallic and semiconductor materials prepared in bulk form may also be referred to as ingots, particularly when cast by mold based methods. [2] Precious metal ingots can be used as currency (with or without being processed into other shapes), or as a currency reserve, as with gold bars .
Precious metals such as gold, silver, and platinum have been used for millennia to create objects of cultural and artistic significance. In jewelry, they are a cornerstone for crafting wedding bands , engagement rings , and ceremonial adornments , often symbolizing love, commitment, and social status.
Precious metals were historically used as coinage, but in the modern era, coinage metals have extended to at least 23 of the chemical elements. [8] There is also extensive use of multi-element metals such as titanium nitride [9] or degenerate semiconductors in the semiconductor industry.
The Rwandan army, as Rwanda Metals, exported at least 100 tons per month. A UN panel estimated that the Coltan extraction causes problems that adjoin or overlap those caused by blood diamonds and uses similar methods such as smuggling across the porous Rwandan border, environmentalists and human rights workers began to speak of " conflict ...
Last month, Beijing banned the export of gallium, germanium, and antimony, key metals used in chipmaking, to the U.S. after the U.S. Commerce Department subjected more Chinese companies to export ...
The precious metals market has seen unprecedented growth this year. Gold prices have shattered records, reaching an all-time high of over $2,700 per ounce in October.
Wafers of single-crystal sapphire are also used in the semiconductor industry as substrates for the growth of devices based on gallium nitride (GaN). The use of sapphire significantly reduces the cost, because it has about one-seventh the cost of germanium. Gallium nitride on sapphire is commonly used in blue light-emitting diodes (LEDs). [68]