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(a) Schematic representation of the -type structure viewed along the close packing direction, projection along the -axis showing the tilting of the octahedra from one octahedral sheet to the next for (b) and (c) .
Calculated, experimental and difference profile plot for refined in the space group (a) and (b) . Tick marks represent Bragg peak positions.
Relative permittivity (at 1 MHz) vs temperature for (a) and (b) .
Summary of the RT microwave dielectric properties, tolerance factor , tilt angle and octahedral tilt transition temperature , for and . was obtained by measuring the resonant frequency of the mode over the temperature range 200–320 K.
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