Do the compounds NaₓIrO₂ and NaOsO₂ exist?

Based on some physics background, I want to know whether have scientists synthesized these two materials: $\ce{Na\_{$x$}IrO2}$ and $\ce{NaOsO2}$ in the lab, if so, what properties do they have? 


I will be very appreciative if someone could recommend me some relevant articles. 



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> Would you be willing to share your interest in these two materials? For example, is there a specific application in mind? If so, we might be able to suggest alternate materials should these two not exist.
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I want to seek a material that has triangular lattice structure, strong spin-orbital coupling (e.g. 5d element) and large (or moderate) coulomb interaction between electrons. For example, $\ce{ABO2}$ type, $\ce{NaOsO2}$ compounds, where $\ce{A}$ and $\ce{B}$ are alkali and transition-metal ions, respectively. So far, I know $\ce{IrTe2}$ may be a one. 
Do you mean that both $\ce{NaxIrO2}$ and $\ce{NaOsO2}$ do not exist?



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> Is there any information on iridium and osmium oxides in these low oxidation states?
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For example, $\ce{Na2IrO3}$ and $\ce{Li2IrO3}$. But these two belong to the honeycomb lattice structure, and what about the triangular lattice structure?




For $\ce{Na\_{x}IrO2}$ the current answer seems to be "no" it has not been made but it is discussed in the literature theoretically.


From [Kitaev-Heisenberg models for iridates on the triangular, hyperkagome, kagome, fcc, and pyrochlore lattices](http://arxiv.org/abs/1303.3290):



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> However, no triangular lattice iridate with the relevant edge sharing octahedra structure is currently available; a compound of the
>  type NaxIrO2 may or may not turn out to be stabilized.
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and in [Chiral spin liquid and topological superconductivity in the undoped and doped
triangular Kitaev-Heisenberg model](http://arxiv.org/pdf/1409.7820.pdf): 



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> In addition, a class of ABO2 (where A and B are alkali and transition metal ions, respectively) type transition metal compounds and the possible material NaxIrO2 may be potential candidates for realizing the triangular Kitaev-Heisenberg model.
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(But that's your paper isn't it? I don't have any information beyond what you already know, so really this is a useless answer.)


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