nonstoichiometric compound

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nonstoichiometric compound

any solid chemical compound in which the numbers of atoms of the elements present cannot be expressed as a ratio of small whole numbers; sometimes called berthollide compounds in distinction from daltonides (in which the atomic ratios are those of small integers), nonstoichiometric compounds are best known among the transition elements. Several of them are important as components of solid-state electronic devices, such as rectifiers, thermoelectric generators, photodetectors, thermistors, and magnets useful in high-frequency circuits

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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