Yes, and it doesn't have to be an alloy. Structure is the basis for 'invisibility cloaks', materials with small-scale structures which confer optical propertie

Yes, and it doesn't have to be an alloy. Structure is the basis for 'invisibility cloaks', materials with small-scale structures which confer optical properties not found in the same unstructured bulk materials. [1] Another example of where structure confers strange properties on elements (not alloys) is light emission from indirect-gap materials like silicon. Make silicon particles small enough and you can get light emission that you can't from bulk silicon. See quantum dots [2] and other similar structures. Structure can really change things. [1] https://en.wikipedia.org/wiki/Metamaterial_cloaking https://en.wikipedia.org/wiki/Metamaterial_cloaking [2] https://en.wikipedia.org/wiki/Quantum_dot https://en.wikipedia.org/wiki/Quantum_dot