Self-assembling of multilayered polymorphs with ion beams
arxiv(2024)
摘要
Polymorphism contributes to the diversity of nature, so that even materials
having identical chemical compositions exhibit variations in properties because
of different lattice symmetries. Thus, if stacked together into multilayers,
polymorphs may work as an alternative approach to the sequential deposition of
layers with different chemical compositions. However, selective polymorph
crystallization during conventional thin film synthesis is not trivial; e.g.
opting for step-like changes of temperature and/or pressure correlated with
switching from one polymorph to another during synthesis is tricky, since it
may cause degradation of the structural quality. In the present work, applying
the disorder-induced ordering approach we fabricated such multilayered
polymorph structures using ion beams. We show that during ion irradiation of
gallium oxide, the dynamic annealing of disorder may be tuned towards
self-assembling of several polymorph interfaces, consistently with theoretical
modelling. Specifically, we demonstrated multilayers with two polymorph
interface repetitions obtained in one ion beam assisted fabrication step.
Importantly, single crystal structure of the polymorphs was maintained in
between interfaces exhibiting repeatable crystallographic relationships,
correlating with optical cross-sectional maps. This data paves the way for
enhancing functionalities in materials with not previously thought capabilities
of ion beam technology.
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