Abstract
The (l-x)Pb(Lu1/2Nb1/2)O3-xPbTiO3 (PLuNT) and (l-x)Pb(Er1/2Nb1/2)O3-xPbTiO3 (PErNT) binary systems have been originally synthesized. Pure lutecium niobate (PLuN) (x = 0) has a pronounced long-range order in the B-sublattice and an antiferroelectric to paraelectric phase transition at ~258°C. The phase structure of the PLuNT system, at room temperature, changes from a pseudomonoclinic (psd-M, space group Bmm2) to tetragonal (T, space group P4mm). The pseudomonoclinic phase extends over the 0 ≤ x ≤ 0.38 interval within which the monoclinic angle β proceeds a minimum near to 90° at x≅0.2. The morphotropic region covers over the interval x = 0.38–0.49, the concentration ratio psd-M:T≅l (the morphotropic phase boundary — MPB) corresponds to x = 0.41. Dielectric dispersion and broadening of the phase transition — features typical to relaxors are observed within the concentration interval of 0.1 ≤ x ≤ 0.3. The highest electromechanical coupling coefficients: kp = 0.66, kt = 0.48, k31 = 0.34 of (l-x)PLuN — xPT ceramics are attained in compositions near the MPB at x≈0.41. Non-isovalent doping of PLuNT with La3+ in Pb sublattice shifts the MPB to lower values of x.
The unit cell of erbium niobate (PErN) is described as pseudomonoclinic of orthorhombic Bmm2 symmetry: a=c=4.216l Å; b=4.0869 Å; β=90.55° and composition is characterized with antiferroelectric phase transition at 305°C. The PErNT system has the morphotropic phase region extending over the x=0.4–0.6 interval.
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Sternberg, A., Shebanovs, L., Antonova, M., Livinsh, M., Shorubalko, I., Yamashita, J.Y. (2000). Structure and Properties of Novel Pb(B’1/2Nb1/2)O3-PbTiO3 Binary Systems with High Piezoelectric Coupling. In: Galassi, C., Dinescu, M., Uchino, K., Sayer, M. (eds) Piezoelectric Materials: Advances in Science, Technology and Applications. NATO Science Series, vol 76. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4094-2_5
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DOI: https://doi.org/10.1007/978-94-011-4094-2_5
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