  In actinide systems, the 5f electrons experience a uniquely delicate balance
of effects and interactions having similar energy scales, which are often
difficult to properly disentangle. This interplay of factors such as the dual
nature of 5f-states, strong electronic correlations, and strong spin-orbit
coupling results in electronically unusual and intriguing behavior such as
multi-k antiferromagnetic ordering, multipolar ordering, mott-physics, mixed
valence configurations, and more. Despite the inherent allure of their exotic
properties, the exploratory science of even the more basic, binary systems like
the actinide oxides has been limited due to their toxicity, radioactivity, and
reactivity. In this article, we provide an overview of the available synthesis
techniques for selected binary actinide oxides, including the actinide
dioxides, sesquioxides, and a selection of higher oxides. For these oxides, we
also review and evaluate the current state of knowledge of their crystal
structures and magnetic properties. In many aspects, substantial knowledge gaps
exist in the current body of research on actinide oxides related to
understanding their electronic ground states. Bridging these gaps is vital for
improving not only a fundamental understanding of these systems but also of
future nuclear technologies. To this end, we note the experimental techniques
and necessary future investigations which may aid in better elucidating the
nature of these fascinating systems.
