Abstract
Resonant X-ray scattering (RXS) in Y 1- x Ca x TiO 3 has been investigated near the Y K -edge. The resonant signal has been clearly found at a forbidden reflection, (500), and the intensity shows an azimuthal angle dependence with a twofold symmetry. The RXS intensities have almost no Ca concentration dependence, although the RXS intensities at the Ti K -edge markedly decrease with increasing Ca concentration. The origin of the RXS at the Y K -edge is clarified to be the deviation from 180° of the Ti–O–Ti bond angle, namely, the tilts of the octahedra around the Y ion. We also discuss the RXS mechanism at the main edge of the Ti K -edge.
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