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me0308至尊木蟲 (著名寫手)
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[求助]
金屬的晶格常數(shù)在哪里查
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最近看了一篇李亞棟寫的在溶液中制備雙金屬材料的綜述,里面說鈀、鉑、金的晶格常數(shù)分別為3.89埃,3.92埃和4.08。用晶種生長法制備雙金屬納米顆粒的時候,鉑和鈀形成核殼產(chǎn)物,鉑和金形成異質(zhì)結(jié)構(gòu)物,最后有個結(jié)論就是兩種金屬的晶格常數(shù)相差太大就不能形成核殼結(jié)構(gòu)。按照這種理論,合成金屬核殼納米結(jié)構(gòu)之前就得先找到兩種金屬的晶格常數(shù),但我查了很多地方都找不到金屬的晶格常數(shù)。也就是在正常情況下的那種,不受到各種應(yīng)力。文獻(xiàn)里的那段原文如下: For Pt and Pd, both metals have a face-centered cubic (fcc) phase with a unit length of 3.92 Å and 3.89 Å respectively.Only 0.77% lattice mismatch indicates that the conformal overgrowth of Pd on the Pt nanocubes should be favored. As a result, Pt/Pd bimetallic core/shell cubes were obtained (Figure 8 a). However, the lattice constant of Au (4.08 Å is much larger than that of Pt. The lattice mismatch between Pt and Au is as high as 4.08%, which effectively prevents conformalovergrowth on the Pt nanocubes, instead giving anisotropic overgrowth of Au on Pt seeds. Consequently, Pt/Au bimetallic heterostructures containing Au rods and a single partially embedded Pt cube at the perimeter of each rod were prepared。 |


至尊木蟲 (著名寫手)
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