impurity

(redirected from impurities)
Also found in: Dictionary, Thesaurus, Legal.

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 ?
Increasing awareness of the deleterious effects of impurities at trace level on specific properties of high purity aluminum oxide used in various fields of modern technology has led to an urgent need for highly sensitive and accurate instrumental analytical techniques with low limits of detection (LODs).
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.
There was a need to remove such sort of impurities for gaining maximum returns, he added.
NONOX Process--The process utilizes a combination of copper metathesis and hydrothermal leach mechanisms to remove or reduce impurities from copper sulphide concentrates while significantly upgrading the copper content.
As these impurities build up over time, hair starts to weaken and feels rough and becomes less manageable.
2) Impurities can occur naturally, or they can be introduced during the synthesis of a product.
PRO and STAR Coatings from Morgan's Molten Metal Systems business have been formulated to reduce impurities and so optimise the quality of the molten metal and the final cast product.
Activated charcoal is one of nature's most powerful ingredients, and it can hold 100 to 200 times its own weight in impurities, helping to purge pores of deeply rooted toxins, excess oils and impurities," a company spokeswoman says.
processes may introduce impurities, which are not found in raw water used.
Genotoxic impurities are any substance inadvertently included in a pharmaceutical preparation that can cause damage at the gene level.
The paste contains approximately 20nm-diameter silicon nanoparticles that include impurities such as boron or phosphorus.