1/3Nb 2/3O 3] 1-x[PbTiO 3] x observed via in situ x-ray microbeam]]>

摘要

Abstract(1-x)Pb(Zn1/3Nb2/3)O3-xPbTiO3((1-x)PZN-xPT in short) is one of the most important piezoelectric materials. In this work, we extensively investigated (1-x)PZN-xPT (x=0.07–0.11) ferroelectric single crystals usingin-situsynchrotron μXRD, complemented by TEM and PFM, to correlate microstructures with phase transitions. The results reveal that (i) at 25°C, the equilibrium state of (1-x)PZN-xPT is a metastable orthorhombic phase for x=0.07 and 0.08, while it shows coexistence of orthorhombic and tetragonal phases for x=0.09 and x=0.11, with all ferroelectric phases accompanied by ferroelastic domains; (ii) upon heating, the phase transformation in x=0.07 is Orthorhombic→Monoclinic→Tetragonal→Cubic. The coexistence of ferroelectric tetragonal and paraelectric cubic phases wasin-situobserved in x=0.08 above Curie temperature (TC), and (iii) phase transition can be explained by the evolution of the ferroelectric and ferroelastic domains. These results disclose that (1-x)PZN-xPT are in an unstable regime, which is possible factor for its anomalous dielectric response and high piezoelectric coefficient.]]>