Discrimination of polar order extent in BaZr x Ti 1-x O 3 epitaxial thin films by Raman spectroscopy

Raman spectroscopy studies of BaZrxTi1-xO3 (BZT) epitaxial thin films are presented over the entire compositional range (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1). The analysis of the results has allowed the elaboration of the phase diagram of the BZT thin films in which three types of ferroelectric behaviour were distinguished based on the polar order extent: long range conventional ferroelectricity for x ≤ 0.2, relaxor behaviour...