X‐ray Photoelectron Spectroscopy Study of High‐ and Low‐Temperature Forms of Zirconium Titanate

X‐ray photoelectron spectroscopy (XPS) spectra were measured for the high‐temperature forms (quenched from 1500°C) of zirconium titanate and its solid solutions, the low‐temperature forms (quenched from 1000°C), and cubic Ba(Zr 1/2 Ti 1/2 )O 3 . Two distinct differences in the XPS spectra were noted between the high‐ temperature forms. The O 1 s spectrum of the high‐temperature form consisted of two peaks of nearly equal intensities with a spacing of 2.2 eV, which was larger than the corresponding spacing of 1.6 eV, for Ba(Zr 1/2 Ti 1/2 )O 3 , while the spectrum of the low‐temperature forms was almost a single peak. The high‐temperature form had an unassignable spectrum with a binding energy of 25 eV between the peaks of Zr 4 p and O 2 s . The unassignable spectrum could be a molecular orbital which had been hypothesized to form in these compounds.