[閒聊] 金銀銅不是本一家的證據
大家安安,小弟季末金五東巴,每天都被銅牌學弟嘴金銀銅本一家
心裡很不是滋味,於是決定找出證據,證明金銀銅是不一樣的。
首先我們先看這張圖
http://imgur.com/tpO3LYn
這是一個金銀銅在240度C的三元相圖
我們可以看出銅銀幾乎不互溶,而銅金之間形成了多種介金屬
也就是,從純銅走到純金這段,需要跨過很多種不同的相才會到
這說明了銅跟金的差距
銅銀也是一樣,純銅到純銀之間,只要銅加一點點銀,或銀加一點點銅
馬上相分離,這表示銅牌跟誰都無法相容
這張三元相圖也許無法說明得很清楚,我們可以直接看大家兩兩的關係
先來一張金銀二元相圖
http://imgur.com/kmmxFOq
兩者固溶的相當好,跟目前的現況頗為吻合
再來是銅金二元相圖
http://imgur.com/CRlqrVT
中間各種形成介金屬
最後是銅銀二元相圖
http://imgur.com/JUQXO20
很顯然中間一大片就是不互溶的區域
由此我們得到結論:
銅牌別再拿金銀銅本一家自慰了
參考資料:
[1] Knight J, Leitch CHB (2001) Phase relations in the system Au–Cu–
Ag at low temperatures, based onnatural assemblages. Can
Mineral 39:889–905
[2] R. P. Elliott and F. A. Shunk, Bull. Alloy Phase Diagrams 1, 45 (1980)
[3] H. Okamoto, D.J. Chakrabarti, D.E. Laughlin, T.B. Massalski
Bull. Alloy Phase Diagrams, 8 (1987), p. 454
[4] Full thermodynamic assessment, adapted for SGTE compatibility by U.R.
Kattner, NIST, 1999.
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