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单词 eutectic mixture
释义
eutectic mixture

Physics
  • A solid solution consisting of two or more substances and having the lowest freezing point of any possible mixture of these components. The minimum freezing point for a set of components is called the eutectic point. Low melting-point alloys are usually eutectic mixtures.


Chemistry
  • A solid solution consisting of two or more substances and having the lowest freezing point of any possible mixture of these components. The minimum freezing point for a set of components is called the eutectic point. Low-melting-point alloys are usually eutectic mixtures.


Chemical Engineering
  • A mixture of substances having the lowest freezing point of all mixtures of the substances. The eutectic point is the lowest temperature at which a solution can exist and that three condensed phases can co-exist (see Fig. 20). Low melting-point alloys are usually eutectic mixtures. For example, the freezing point of pure lead and pure tin are 327°C and 232°C, respectively, whereas a mixture with 62 per cent lead (soft solder) has a eutectic point of 183°C.

    eutectic mixture

    Fig. 20 Eutectic point


Electronics and Electrical Engineering
  • A mixture of elements that retains its composition in both solid and liquid form: there is no segregation of the components. Eutectic mixtures are often used to form electrical contacts, usually ohmic contacts, to semiconductor devices. For example, a gold-germanium eutectic mixture (88:12 w/o Au:Ge) is used as the basis of ohmic contacts to n-type gallium arsenide, where the gold provides the metallic contact and the germanium dopes heavily the surface of the gallium arsenide. The eutectic is evaporated from a solid source and retains its composition on condensation on the semiconductor surface.


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