Comment on “Complete sets of elastic, dielectric, and piezoelectric properties of flux-grown [011]-poled Pb(Mg1/3Nb2/3)O3−(28–32)% PbTiO3 single crystals” [ Appl. Phys. Lett. 92, 142906 (2008) ]

摘要

Complete sets of elastic, dielectric, and piezoelectricnu0001i.e., electromechanicalu0002 constants of single crystals ofnrelaxor-ferroelectric solid solutions are of value for modernnpiezotechnical applications. Recently, Shanthi et al.1 experimentallynstudied electromechanical properties of polydomainnu00011−xu0002Pbu0001Mg1/3Nb2/3u0002O3−xPbTiO3 u0001PMN−xPTu0002 single crystalsnnear the morphotropic phase boundary. Reference 1 containsnthe complete sets of room-temperature electromechanicalnconstants of PMN−xPT single crystals u0001x=0.28, 0.30,nand 0.32u0002. These single crystals have been poled along thenperovskite unit-cell direction u0003011u0004 and characterized bynorthorhombic symmetry. However, as follows from an analysisnof the aforementioned complete sets, not all groups ofnelectromechanical constants1 of PMN−xPT are consistent.nFor instance, it concerns interconnections