Phase transitional behavior and piezoelectric properties of the orthorhombic phase of Pb(Mg1/3Nb2/3)O3–PbTiO3 single crystals

Abstract

We report on the observation of an orthorhombic ferroelectric phase in 0.67Pb(Mg1/3Nb2/3)O3–0.33PbTiO3 single crystals, whose polarization is along 〈011〉 direction and stability can be altered by poling conditions. We studied the piezoelectric properties on poled 〈011〉 crystals, in both monodomain and polydomain states, and found that the piezoelectric d32 coefficient, which is the piezoelectric response in perpendicular to the poling direction, is positive in both cases. Based on the phenomenological theory, we show that this is possible in a crystal with the electrostrictive coefficients Q11>Q44–Q12.

Pseudolinearity in the inverse dielectric susceptibility of poled Pb(Mg1/3Nb2/3)O3–PbTiO3 crystals

“…Figure 3 shows the inverse dielectric susceptibility for the ͗011͘ oriented specimen in the FE r polydomain state, alongside data for a ͗011͘ oriented specimen in a fully poled FE o monodomain state. 16 Comparisons of these data will confirm that C is significantly higher in the polydomain (5.5ϫ10 5 ) versus the monodomain condition (1.5ϫ10 5 ).…”

“…͗001͘ and ͗111͘ poled oriented crystals have been shown to be polydomain. 16 In the poled condition, along the ͗111͘, the dielectric constant K is ϳ10 3 , whereas along the ͗001͘ or ͗110͘ it is dramatically higher ϳ10 4 . Also, It has been shown to be possible to trap a metastable FE o state at 25°C by poling along the ͗110͘.…”

“…Also, It has been shown to be possible to trap a metastable FE o state at 25°C by poling along the ͗110͘. 16 Figures 1͑a͒-1͑c͒ show K Ϫ1 as a function of temperature for poled ͗111͘, ͗011͘, and ͗001͘ oriented 0.67PMN-0.33PT crystals, respectively. In these figures, K Ϫ1 can be seen to have a pseudolinear relationship with T in the low temperature poled condition for 25ϽTϽ75°C.…”

“…16 The phase transition sequence with increasing temperature is FE r to FE o to FE t . In the FE r state, only the ͗111͘ orientation is fully poled and in a monodomain condition.…”

Three intrinsic relationships of lattice parameters between intermediate monoclinicMCand tetragonal phases in ferroelectricPb[(Wang1 2006Phys. Rev. B771200View full textAdd to dashboardCite

“…Recent extensive experimental investigations have discovered new intermediate phases and revealed fascinating while puzzling phase behaviors around the MPBs. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] Since the recent discovery of an intermediate monoclinic M A phase in PZT near its MPB, [23][24][25][26][27][28] new intermediate phases have also been discovered in PZN-xPT and PMN-xPT near their respective MPBs, namely, monoclinic M A , [8][9][10] monoclinic M C , [8][9][10][11][12] orthorhombic ͑Refs. 8 and 13-15͒ phases in PZN-xPT, and orthorhombic, 16,17 monoclinic M C , 12,[18][19][20][21] monoclinic M A , 21,22 as well as a third monoclinic M B phase ͑Refs.…”