Monoclinic phase in the relaxor-based piezo-/ ferroelectric Pb(Mg${}_{1/3}$Nb${}_{2/3})O_3$-PbTiO${}_3$ system

Abstract

A ferroelectric monoclinic phase of space group $Cm$ ($M_A$ type) has been discovered in 0.65Pb(Mg${}_{1/3}$Nb${}_{2/3})O_3$-0.35PbTiO${}_3$ by means of high resolution synchrotron X-ray diffraction. It appears at room temperature in a single crystal previously poled under an electric field of 43 kV/cm applied along the pseudocubic [001] direction, in the region of the phase diagram around the morphotropic phase boundary between the rhombohedral (R3m) and the tetragonal (P4mm) phases. The monoclinic phase has lattice parameters a = 5.692 A, b = 5.679 A, c = 4.050 A and $\beta$ = $90.15^{\circ }$, with the b${}_m$-axis oriented along the pseudo-cubic [110] direction . It is similar to the monoclinic phase observed in PbZr${}_{1-x}$Ti${}_x$O${}_3$, but different from that recently found in Pb(Zn${}_{1/3}$Nb${}_{2/3})O_3$-PbTiO${}_3$, which is of space group $Pm$ ($M_C$ type).

Revised version after referees' comments. PDF file. 6 pages, 4 figures embedded

References in corpus (2)

• Universal Phase Diagram for High-Piezoelectric Perovskite Systems
• Electric-field induced polarization paths in PZT alloys

Cited by in corpus (22)

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