Talk:Eutectic system

message: This article needs some major expansion in this area; eutectics form because of limited solubility of one component in another and thus the favourability of separating into a mixture of two phases of distinct compositions, but the article doesn't really comment on this. John Riemann Soong (talk) 12:47, 12 November 2009 (UTC)
thread_title:  thermodynamics of eutectics 

message: I don't like how this article is named "eutectic point" because that is just part of the whole system. My Foundations of material science and engineering book calls it a binary eutectic alloy system, but I feel that's too complex, so I propose a rename to eutectic system. Then we can easily incorporate lots of other terms (some of which are already in the article), like eutectic composition, eutectic composition, eutectic reaction, etc. Wizard191 (talk) 00:46, 19 November 2009 (UTC)
thread_title:  Renaming to [[Eutectic system]] 

message: I would just like to say that I was very impressed with this article. It explains a complicated concept clearly and concisely.
Thank you. Jnnnnn (talk) 03:55, 4 January 2010 (UTC)
replies: text: Thanks for the kind words! Wizard191 (talk) 15:43, 4 January 2010 (UTC)
thread_title:  Excellent article 

message: I agree it describes the phenomenon very well.  I would like to understand why the melting point of a mixture of two substances would be lower than that of either substance individually.  —Preceding unsigned comment added by 130.76.96.21 (talk) 18:05, 4 May 2010 (UTC)
replies: text: You might want to read this (through page 53). It appears that scientists don't know. Wizard191 (talk) 16:39, 6 May 2010 (UTC)
thread_title:  There is no Theory Explained 

message: It might be interesting to also explain the influence of time in this process.  Yes, Eutectic reaction takes place if cooling is sufficiently slow. Then the thermodynamics and free energy drive the process.  Okay.
But crystallization of two solid phases from a liquid is a kinetic reaction and takes time.  If you cool very rapidly and get to a sufficiently low temperature while remaining in a non-crystallized structure like the liquid, then you form a metallic glass.  These metallic glasses are amorphous materials with no long range crystal structure (though short range clustering is certain to occur).  If the local minima of the free energy is sufficiently deep, then the amorphous structure can be stable over long periods of time at room temperature.
In all cases, the discussion here leads to a new link to amorphous materials which are an interesting class of materials.  —Preceding unsigned comment added by 178.198.133.52 (talk) 21:21, 12 October 2010 (UTC)
replies: text: Feel free to add the above to the article. Wizard191 (talk) 22:25, 13 October 2010 (UTC)
thread_title: Influence of time

message: A eutectic system is a mixture of chemical compounds or elements that has a single multiple chemical composition that solidifies...
This "single multiple" is hardly readable. What is it trying to say? Does anyone care to rephrase that?  — Preceding unsigned comment added by 129.132.45.228 (talk) 13:58, 12 November 2012 (UTC)
replies: text: Fixed it myself (by looking at the history), sorry for the spam!  — Preceding unsigned comment added by 129.132.45.228 (talk) 14:02, 12 November 2012 (UTC)
thread_title:  a '''single multiple''' chemical composition ?? 

message: In the lead section, a eutectic system is defined as follows:
:A eutectic system is a mixture of chemical compounds or elements that has a single chemical composition that solidifies at a lower temperature than any other composition made up of the same ingredients.
It then says:
:Not all binary alloys have a eutectic point; for example, in the silver-gold system the melt temperature (liquidus) and freeze temperature (solidus) both increase monotonically as the mix changes from pure silver to pure gold.
The article could really use some expansion on this: why is there not a eutectic point at a composition of 100% silver and 0% gold?  From the explanation and by looking at cited phase diagram, that composition seems to fit the definition of "solidifying at a lower temperature than any other composition made up of the same ingredients." Draconx (talk) 19:14, 28 November 2012 (UTC)
replies: text: That's because a eutectic system is, as pointed out in your qouted text, a mixture- "a material system made up of two or more different substances". Tomásdearg92 (talk) 23:56, 6 December 2012 (UTC)
thread_title:  More detail needed on binary alloys without any eutectic point. 

message: Dear Author(s),
Please revisit the opening phrase construct -- "a mixture of chemical compounds ... (with) ... a single chemical composition". Could you have possibly meant "a solid mixture of at least two crystalline lattice systems of one and the same element or chemical compound" -- with a unique, specific ratio, for which the melting of ALL lattice systems occurs at once ?
Thank you for your consideration.
P.S. ON SECOND THOUGHT, I HAVE DECIDED AND FOLLOWED THE REQUEST OF MANY READERS AND PERFORMED MYSELF SOME MAJOR EDITING TO CLARIFY THIS CONFUSING BEGINNING OF AN ARTICLE. THANK YOU.
  — Preceding unsigned comment added by Waldemahr (talk • contribs) 16:09, 19 August 2014 (UTC)
thread_title:  Please Check the Logic Behind Wording 

message: So, a eutectic system is one that has a melting temperature equal to freezing temperature? If so, the first sentence can and should be simplified considerably.
Danielx (talk) 17:29, 19 March 2015 (UTC)
replies: text: That's not the definition of it. It's one of several properties that they have, but other substances have this property and this property here is only one of several that together result from the underlying definitions. DMacks (talk) 18:06, 19 March 2015 (UTC)
thread_title:  melting temperature = freezing temperature ? 

message: The eutectic reaction is stated to be the following in the article:
:\text{Liquid} \xrightarrow[\text{cooling}]{\text{eutectic temperature}} \alpha \,\, \text{solid solution} + \beta \,\, \text{solid solution}
Shouldn't this statement make clear the reversible nature of the eutectic reaction about the eutectic temperature, i.e. be of the form:
:\text{Liquid} \begin{matrix} {\scriptstyle\text{cooling}}\\ \rightleftharpoons\\ {\scriptstyle\text{heating}} \end{matrix} \alpha \,\, \text{solid solution} + \beta \,\, \text{solid solution}
I'm no master at LaTeX, so I'm sure there could be a more legible way of rendering this. 38.129.203.74 (talk) 04:42, 12 May 2015 (UTC)
thread_title:  Eutectic Reaction 

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thread_title:  External links modified 

message: The Plate tectonics article mentions in passing that silica and water form a deep eutectic.  It might be good to include some description at . There is no mention on Silica either, but I will also place a similar comment at the talk page there. —Theodore Kloba (☎) 14:01, 20 September 2017 (UTC)
thread_title:  Silica + Water System  

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thread_title:  External links modified 

message: Why hasn't "since the valence electrons of the component species are not always compatible" been clarified?  — Preceding unsigned comment added by 2601:58B:4204:B6B0:1C3B:23B:9126:70D6 (talk) 19:57, 26 April 2024 (UTC)
thread_title: Valence electrons