Definitions for semimetal
semimet·al

WiktionaryRate this definition:0.0 / 0 votes

1. semimetalnoun

   a metalloid

Samuel Johnson's DictionaryRate this definition:0.0 / 0 votes

1. Semimetalnoun

   Half metal; imperfect metal.

   Etymology: semi and metal.

   Semimetals are metallick fossils, heavy, opake, of a bright glittering surface, and not malleable under the hammer; such as quicksilver, antimony, cobalt, with the arsenicks, bismuth, zink, with its ore calamine: to these may be added the semi-metallick recrements, such as tutty and pampholyx. Hill.

WikipediaRate this definition:0.0 / 0 votes

1. Semimetal

   A semimetal is a material with a very small overlap between the bottom of the conduction band and the top of the valence band. According to electronic band theory, solids can be classified as insulators, semiconductors, semimetals, or metals. In insulators and semiconductors the filled valence band is separated from an empty conduction band by a band gap. For insulators, the magnitude of the band gap is larger (e.g., > 4 eV) than that of a semiconductor (e.g., < 4 eV). Because of the slight overlap between the conduction and valence bands, semimetals have no band gap and a negligible density of states at the Fermi level. A metal, by contrast, has an appreciable density of states at the Fermi level because the conduction band is partially filled.

Webster DictionaryRate this definition:3.0 / 1 vote

1. Semimetalnoun

   an element possessing metallic properties in an inferior degree and not malleable, as arsenic, antimony, bismuth, molybdenum, uranium, etc

WikidataRate this definition:0.0 / 0 votes

1. Semimetal

   According to electronic band theory, solids can be classified as insulators, semiconductors, semimetals, or metals. In insulators and semiconductors the filled valence band is separated from an empty conduction band by a band gap. For insulators, the magnitude of the band gap is larger than that of a semiconductor. Metals have a partially filled conduction band. A semimetal is a material with a very small overlap between the bottom of the conduction band and the top of the valence band. A semimetal thus has no band gap and a negligible density of states at the Fermi level. A metal, by contrast, has an appreciable density of states at the Fermi level because the conduction band is partially filled. The insulating/semiconducting states differ from the semimetallic/metallic states in the temperature dependency of their electrical conductivity. With a metal, the conductivity decreases with increases in temperature. With an insulator or semiconductor, both the carrier mobilities and carrier concentrations will contribute to the conductivity and these have different temperature dependencies. Ultimately, it is observed that the conductivity of insulators and semiconductors increase with initial increases in temperature above absolute zero, before decreasing with intermediate temperatures and then, once again, increasing with still higher temperatures. The semimetallic state is similar to the metallic state but in semimetals both holes and electrons contribute to electrical conduction. With some semimetals, like arsenic and antimony, there is a temperature-independent carrier density below room temperature while, in bismuth, this is true at very low temperatures but at higher temperatures the carrier density increases with temperature giving rise to a semimetal-semiconductor transition. A semimetal also differs from an insulator or semiconductor in that a semimetal's conductivity is always non-zero, whereas a semiconductor has zero conductivity at zero temperature and insulators have zero conductivity even at ambient temperatures.

Anagrams for semimetal »

1. lemmatise

2. mealtimes

How to pronounce semimetal?

1. Alex

   US English

   David

   US English

   Mark

   US English

   Daniel

   British

   Libby

   British

   Mia

   British

   Karen

   Australian

   Hayley

   Australian

   Natasha

   Australian

   Veena

   Indian

   Priya

   Indian

   Neerja

   Indian

   Zira

   US English

   Oliver

   British

   Wendy

   British

   Fred

   US English

   Tessa

   South African

How to say semimetal in sign language?

Numerology

1. Chaldean Numerology

   The numerical value of semimetal in Chaldean Numerology is: 3

2. Pythagorean Numerology

   The numerical value of semimetal in Pythagorean Numerology is: 7

References

1. ^ Wiktionary
   https://en.wiktionary.org/wiki/Semimetal
2. ^ Samuel Johnson's Dictionary
   https://johnsonsdictionaryonline.com/views/search.php?term=semimetal
3. ^ Wikipedia
   https://en.wikipedia.org/wiki/Semimetal
4. ^ Webster Dictionary
   https://www.merriam-webster.com/dictionary/semimetal
5. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=semimetal