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Crystal structure of the double perovskite . The light octahedra, , the darker . and are represented by the light and dark spheres, respectively.
(a) HRTEM image showing the checkerboard contrast along . Doubling of the (110) d-spacings is highlighted by white cross-hatching; APB’s are evident in the upper-right region. (b) Corresponding SAED pattern.
Low magnification TEM image along  showing periodic modulation extends across entire crystal; Inset shows corresponding fast Fourier transform.
 Z-contrast image showing a faint compositional modulation.
Synchrotron PXRD pattern of ; stars indicate the peaks from the sodium rich impurities and . Lower hash marks correspond to the expected positions based on refined lattice parameters.
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