Abstract
A complex oxide Ho 2Mn 2/3Ta 4/3O 7 was synthesized in an Ar atmosphere containing 1% H 2 at 1523 K. The compound was structurally characterized using X-ray diffraction (XRD) and transmission electron microscopy (TEM). Its structure consisted of a trigonal basic cell and a super cell with an incommensurate nature. The incommensurate nature of the superstructure was confirmed to have orientation anomalies appearing along the c∗- and b∗-directions in the super-cell reflections. Wavy moiré-like images were observed in the dark-field images from reflections exhibiting the orientation anomalies.
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