Abstract
Incommensurate modulation structure in uniaxial relaxor ferroelectric Ca0.28Ba0.72Nb2O6 single crystals was investigated using transmission electron microscopy (TEM). The wave-modulation vector can be expressed as q=(1∕2)c*+(1+δ)(a*−b*)∕4, where the incommensurability parameter δ was determined to be about 0.09 from [110] diffraction pattern. High-resolution TEM observations along [110] zone provided direct evidence of the incommensurate superstructure. Structural modulation was also evident by high-resolution TEM images through [001] zone, where a sinusoidal variation along [110] and [11¯0] was identified. The incommensurate superlattice structure is caused by the uniform mixing of slabs of two orthorhombic cells.
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