# 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.

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.

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?

Is there any information on iridium and osmium oxides in these low oxidation states?

For example, $\ce{Na2IrO3}$ and $\ce{Li2IrO3}$. But these two belong to the honeycomb lattice structure, and what about the triangular lattice structure?

• Welcome to Chemistry.SE. 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. – Ben Norris Jan 15 '14 at 12:01
• Is there any information on iridium and osmium oxides in these low oxidation states? – Klaus-Dieter Warzecha Jan 15 '14 at 12:05
• @Ben Norris 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, ABO$_2$ type(NaOsO$_2$) compounds, where A and B are alkali and transition-metal ions, respectively. So far, I know IrTe$_2$ may be a one. Do you mean that both Na$_x$IrO$_2$ and NaOsO$_2$ do not exist?Thank you very much. – Kai Li Jan 18 '15 at 11:50
• @Klaus Warzecha For example, Na$_2$IrO$_3$ and Li$_2$IrO$_3$. But these two belong to the honeycomb lattice structure, and what about the triangular lattice structure? Thank you very much. – Kai Li Jan 18 '15 at 11:54

## 1 Answer

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.

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.

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.

(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.)