(Zr,Ti)O-2 interface structure in ZrO2-TiO2 nanolaminates with ultrathin periodicity
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A mixed cation interfacial structure in ZrO2-TiO2nanolaminate films with ultrathin bilayer periodicity grown by sputter deposition at 297 K was identified by x-ray diffraction and nonresonant Raman spectroscopy. This structure consists of an amorphous phase at a ZrO2-on-TiO2bilayer interface, followed by an extensive crystalline monoclinic (Zr,Ti)O2solid solution predicted by Vegard's law. Monoclinic (Zr,Ti)O2has previously been reported only once, in bulk powder of a single composition (ZrTiO4) at high pressure. Its stabilization in the nanolaminates is explained by the Gibbs-Thomson effect. This complex interfacial structure is shown to be a means of accommodating chemical mixing in the absence of a driving force for heteroepitaxy. 2002 American Institute of Physics.