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(a) Evolution of neutron powder patterns of with composition. The inset shows magnified plot of . The indices on top of the Bragg peaks correspond to a doubled pseudocubic cell . (b) Composition variation of two selected Na/Bi/Ca–O distances obtained after refinement with the orthorhombic structure.
Temperature variation of the relative permittivity (at 10 kHz) of for , 0.10, and 0.15.
(a) Variation of pseudocubic lattice parameters with composition of the orthorhombic compositions of . (b) Variation of pseudocubic volume with composition.
Structural parameters of the rhombohedral and orthorhombic phases for .
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