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Figure 1
Schematic rendering of (a) the KNbO3 structure and (b) correlated Nb (red arrows) and O (orange arrows) displacements within the 〈100〉 –Nb—O—Nb—O– chains. The cubic KNbO3 structure contains such chains with Nb atoms displaced along all inequivalent 〈111〉 directions. Oxygen atoms in each chain are displaced toward Nb.

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