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arXiv 1312.6014cond-mat.mtrl-sci
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溅射Cr2CoGa薄膜中的多相结构

Multiple phases in sputtered Cr2CoGa films

Manuel P. Geisler, Markus Meinert, Jan Schmalhorst, Günter Reiss, Elke Arenholz

摘要:

通过磁控共溅射,在MgO和MgAl2O4上沉积标称Cr2CoGa化合物的薄膜。为了实现反Heusler结构中的结晶,测试了不同的热处理。而不是逆Heusler结构,我们观察到相分离和沉淀物的形成依赖于热处理。主要析出相为Cr3Ga,呈A15结构。剩余部分形成B2结构中的富Co CoGa和可能的σ相中的富Cr CoCr。

英文摘要:

By magnetron co-sputtering, thin films of a nominal Cr2CoGa compound were deposited on MgO and MgAl2O4. To achieve crystallisation in the inverse Heusler structure, different heat treatments were tested. Instead of the inverse Heusler structure, we observed phase separation and precipitate formation in dependence on the heat treatment. The main precipitate is Cr3Ga in A15 structure. The remainder forms Co-rich CoGa in the B2 structure and possibly Cr-rich CoCr in the sigma-phase.

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