impurity


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Related to impurity: impurity band, dissensions

impurity

Electronics a small quantity of an element added to a pure semiconductor crystal to control its electrical conductivity

impurity

[im′pyu̇r·əd·ē]
(science and technology)
An undesirable foreign material in a pure substance.
(solid-state physics)
A substance that, when diffused into semiconductor metal in small amounts, either provides free electrons to the metal or accepts electrons from it.
References in periodicals archive ?
An elevated impurity has the potential to decrease effectiveness of the product in patients.
Offering our impurity solutions as a stand-alone service--beyond providing them as an accompanying service to AMRI's Discovery & Development services, or API and Drug Product programs--will enable us to extend our comprehensive expertise, purpose-built technologies and resources to our customers for impurity assessments and control," said John Iannone, director, extractables/leachables and impurities, AMRI.
Also, the lower cost and reduced risk of impurity removal processes may provide added incentive.
Due to the effects caused by the impurity within the crystal lattice, the analysis of the electron in the crystal has led to some complications.
There is a strong need to better understand the relationship between the water content and the impurity concentration at which corrosive phases form and corrosion takes place.
Furthermore, on the one hand it was shown that VP Si 363 is stable at 120[degrees]C, even in the presence of the NR impurity (measurement of the amount of silane after stirring at 120[degrees]C in squalene without silica) and does not react with squalene.
There is a huge range of impurity tolerance," Elsa Olivetti, an MIT researcher on the study, said in a statement.
The contamination or impurity could be because of sunlight exposure, but we are taking this matter seriously until the final test results are out," added the official.
It has been predicted that from now on, Iran's exporting oil in Kharg terminal be transmitted to oil tankers with a better quality and without any impurity.
the 1p-1d and 1d-1f transitions of QD with and without impurity.