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F367 (2016)

F367 (2016). Relaxor-to-ferroelectric crossover and disruption of polar order in ‘empty’ tetragonal tungsten bronzes.

HRTEM image and the corresponding SAED pattern from Ba4Nd0.67Nb10O30. The inset is an enlarged image showing dark spot contrast with local atomic dislocation. The SAED pattern is indexed onto the TTB basic unit cell. The interspot distances, a and b, are not equal, indicating an incommensurate structure modulation. [J. Gardner, F. J. Yu, C. Tang, W. Kockelmann, W. Z. Zhou, F. D. Morrison, Chem. Mater. 28, 4616–4627 (2016).]

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