Raman spectroscopy and lattice dynamical calculation contributions to symmetry determination of zone center phonons in tetragonal ZrO_2

摘要

Tetragonal undoped zirconia which is a metastable form of the well known hightemperature zirconia can be stabilized at room temperature by nanocrystallite size effect. Recent Raman characterization performed on zirconia thin films grown during Zircaloy oxidation demonstrates that a tetragonal zirconia is stabilized at the metal-oxide interface at rather low temperature (360 °C) by high compressive stresses (>2GPa).