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Akio Mitsui coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Kenji Homma coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Koji Kawamoto coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Masaaki Hirayama coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Masao Yonemura coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Noriaki Kamaya coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

The diffusion coefficient relates particle flux to concentration gradient through Fick's first law, $\mathbf{j}=-D\nabla c$. For unbiased isotropic motion in $d$ dimensions it can equivalently be defined by the long-time mean squared displacement:An uncorrelated random walk with jump length $a$ and total jump rate $\Gamma$ has $⟨r^2⟩=\Gamma a^{2}t$, hence $D=\Gamma a^2/(2d)$; correlations introduce a multiplicative correlation factor. The factor $d$ counts the directions sharing the total displacement. It does not mean that the same material's single-coordinate diffusivity changes merely by choosing to observe fewer coordinates: $⟨x^2⟩=2Dt$ in every Cartesian direction of the same isotropic system.

At $500$ K, silver iodide is in its fast-ion-conducting $\alpha$ phase. For an order-of-magnitude estimate, take a jump length $a\sim 3$ Å and an effective successful jump rate $\Gamma \sim 10^{11}{\mathrm{s}}^{-1}$. ThenThus $D$ of order $10^{-9}{\mathrm{m}}^2{\mathrm{s}}^{-1}$ is a reasonable estimate for this superionic conductor. The length and rate are explicitly assumed material scales; the question supplies neither a measured conductivity nor jump data, so an exact numerical coefficient cannot be deduced from temperature alone. The estimate is not presented as an experimentally measured value.

Ryoji Kanno coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Shigenori Hama coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Takashi Kamiyama coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Yuichiro Yamakawa coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.

Yuki Kato coauthored research on superionic conductor.^[ref]

A solid with unusually rapid ionic motion while its host framework remains ordered.