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http://dbpedia.org/ontology/abstract 化合物熔化形成的液体与固体成分相同时,就会发生一致熔融,与不一致熔融相對。一致熔融通化合物熔化形成的液体与固体成分相同时,就会发生一致熔融,与不一致熔融相對。一致熔融通常发生於双组分体系。一般情况下,设A和B是两种组分,AB是由它们化学结合形成的稳定固体化合物。画出系统相图,則有三个固相,即A、B和化合物AB。相应地,这三个固相有三个熔点或冰点曲线AC、BE和CDE。相图中顶点D是化合物AB的熔点,因为此時固相和液相组成相同。在这个温度下,由于固、液相均只含有化合物AB,双组分体系变成了单组分体系。 一致熔融点代表确定的温度,就像纯组分的熔点一样。在相图中,化合物AB的熔点D高于纯组分A和B的熔点,但这并不一定正确。在已知不同类型的体系中,一致熔融点小于纯组分的熔点。 这种情况发生於金属间化合物,如MgSi2。型的体系中,一致熔融点小于纯组分的熔点。 这种情况发生於金属间化合物,如MgSi2。 , Congruent melting occurs during melting ofCongruent melting occurs during melting of a compound when the composition of the liquid that forms is the same as the composition of the solid. It can be contrasted with incongruent melting. This generally happens in two-component systems. To take a general case, let A and B be the two components and AB a stable solid compound formed by their chemical combination. If we draw a phase diagram for the system, we notice that there are three solid phases, namely A, B and compound AB. Accordingly, there will be three fusion or freezing point curves AC, BE and CDE for the three solid phases. In the phase diagram, we can notice that the top point D of the phase diagram is the congruent melting point of the compound AB because the solid and liquid phases now have the same composition. Evidently, at this temperature, the two-component system has become a one-component system because both solid and liquid phases contains only the compound AB. Congruent melting point represents a definite temperature just like the melting points of pure components. In some phase diagrams, the congruent melting point of a compound AB may lie above the melting points of pure components A and B. But it is not always necessarily the case. There are different types of systems known in which the congruent melting point is observed below the melting points of the pure components. This happens for inter-metallic compounds, for example, for MgSi2.etallic compounds, for example, for MgSi2. , Une substance solide possède un point de fUne substance solide possède un point de fusion congruent quand le liquide produit à son point de fusion a la même composition chimique. Dans le cas contraire son point de fusion est dit incongruent. On dit aussi de la fusion d'une substance qu'elle est congruente ou incongruente. Ce point de fusion se trouve sur les diagrammes solide-liquide (diagramme de phase) et se caractérise par l'intersection d'une ligne verticale avec le sommet du liquidus (point D sur la figure ci-contre [ la figure n'est plus visible !!]). Sur ce diagramme, le solide constitué de A et de B en mélange 50/50 est un réel composé défini. Celui-ci est stable jusqu'à sa fusion au-delà de laquelle il devient un mélange homogène liquide de A et de B. Le diagramme a donc la forme de deux diagrammes solide-liquide simples côte à côte. Le premier diagramme correspondant au mélange A avec le composé AB et le second correspondant au mélange entre le composé AB et B.ndant au mélange entre le composé AB et B. , Конгруэнтное плавление (лат. congruentis —Конгруэнтное плавление (лат. congruentis — совпадающий) — термин физической химии, обозначающий процесс, в котором состав жидкости совпадает с составом твердой фазы — химического соединения, из которого эта жидкость образовалась. Для того чтобы определить содержание в расплаве конгруэнтно плавящихся компонентов и выяснить состав полностью закристаллизовавшегося расплава используют .кристаллизовавшегося расплава используют .
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rdfs:comment Конгруэнтное плавление (лат. congruentis —Конгруэнтное плавление (лат. congruentis — совпадающий) — термин физической химии, обозначающий процесс, в котором состав жидкости совпадает с составом твердой фазы — химического соединения, из которого эта жидкость образовалась. Для того чтобы определить содержание в расплаве конгруэнтно плавящихся компонентов и выяснить состав полностью закристаллизовавшегося расплава используют .кристаллизовавшегося расплава используют . , Congruent melting occurs during melting ofCongruent melting occurs during melting of a compound when the composition of the liquid that forms is the same as the composition of the solid. It can be contrasted with incongruent melting. This generally happens in two-component systems. To take a general case, let A and B be the two components and AB a stable solid compound formed by their chemical combination. If we draw a phase diagram for the system, we notice that there are three solid phases, namely A, B and compound AB. Accordingly, there will be three fusion or freezing point curves AC, BE and CDE for the three solid phases. In the phase diagram, we can notice that the top point D of the phase diagram is the congruent melting point of the compound AB because the solid and liquid phases now have the same composition. Evidently, aow have the same composition. Evidently, a , Une substance solide possède un point de fUne substance solide possède un point de fusion congruent quand le liquide produit à son point de fusion a la même composition chimique. Dans le cas contraire son point de fusion est dit incongruent. On dit aussi de la fusion d'une substance qu'elle est congruente ou incongruente. Le diagramme a donc la forme de deux diagrammes solide-liquide simples côte à côte. Le premier diagramme correspondant au mélange A avec le composé AB et le second correspondant au mélange entre le composé AB et B.ndant au mélange entre le composé AB et B. , 化合物熔化形成的液体与固体成分相同时,就会发生一致熔融,与不一致熔融相對。一致熔融通化合物熔化形成的液体与固体成分相同时,就会发生一致熔融,与不一致熔融相對。一致熔融通常发生於双组分体系。一般情况下,设A和B是两种组分,AB是由它们化学结合形成的稳定固体化合物。画出系统相图,則有三个固相,即A、B和化合物AB。相应地,这三个固相有三个熔点或冰点曲线AC、BE和CDE。相图中顶点D是化合物AB的熔点,因为此時固相和液相组成相同。在这个温度下,由于固、液相均只含有化合物AB,双组分体系变成了单组分体系。 一致熔融点代表确定的温度,就像纯组分的熔点一样。在相图中,化合物AB的熔点D高于纯组分A和B的熔点,但这并不一定正确。在已知不同类型的体系中,一致熔融点小于纯组分的熔点。 这种情况发生於金属间化合物,如MgSi2。型的体系中,一致熔融点小于纯组分的熔点。 这种情况发生於金属间化合物,如MgSi2。
rdfs:label Punto di fusione congruente , Конгруэнтное плавление , Congruent melting , 一致熔融 , Point de fusion congruent
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