Phase transition and chemical order in the ferroelectric perovskite (1−x)Bi(Mg3∕4W1∕4)O3–xPbTiO3 solid solution system

Abstract

Building on the ferroelectric family based on the Bi(Me+3)O3–PbTiO3 solid solutions, the complex solid solution (1−x)Bi(Mg3∕4W1∕4)O3–xPbTiO3 [(1−x)BMW–xPT] was investigated. This system was found to exhibit a broad morphotropic phase boundary at x∼0.48mol% PbTiO3 with a corresponding Curie temperature of 205°C separating pseudocubic and tetragonal ferroelectric phases. Based on dielectric, x-ray diffraction (XRD), and calorimetric data, a simple dielectric phase field diagram was established. On further structural analysis with diffraction contrast transmission electron microscopy along with XRD, evidence of B-site chemical ordering was found for the (1−x)Bi(Me′Me″)O3–xPbTiO3 perovskite family.

Phase transitional behavior and dielectric properties of lead free (1−x)(K0.5Na0.5)NbO3−xBi(Zn0.5Ti0.5)O3 ceramics

“…Choi et al [22] reported that in the Bi(Ni 1/2 Ti 1/2 )O 3 -PbTiO 3 (BNiT-PT), the tricritical point in the solid solution also corresponded closely to t ∼ 1.0. Similar phenomena have been observed in the Bi(Mg 3/4 W 1/4 )O 3 -PbTiO 3 (BMW-PT) system by Stringer et al [23] and our previous work on PbZrO 3 related materials [24,25].…”

Classification of transition temperature behavior in ferroelectric PbTiO3–Bi(Me′Me″)O3 solid solutions

“…[5][6][7] Recent investigations have been performed on various ͑1−x͒PbTiO 3 -͑x͒Bi͑MeЈMeЉ͒O 3 solid solutions, with the objective of developing high T c ceramics with piezoelectric activities suitable for commercial exploitation. [8][9][10][11][12][13] In Bi͑MeЈMeЉ͒O 3 systems, the MeЈ and MeЉ cations occupy the octahedral sites of the perovskite structure in ratios that give a ͗+3͘ average valence. In more simple solid solutions of PbTiO 3 -Bi͑Me͒O 3 , Me is a single cation on the octahedral site with a +3 valence, such as Sc +3 in BiScO 3 .…”

Temperature dependence of piezoelectric properties of high-TC Bi(Mg1/2Ti1/2)O3–PbTiO3

“…[1][2][3] The operating temperature of piezoelectric ceramics is generally limited to one-half of the Curie point ͑T C ͒ due to loss of polarization, typically at temperatures lower than 200°C ͓e.g., 150°C for the conventional piezoelectric materials based on the Pb͑Zr 1−x Ti x ͒O 3 ͑PZT͔͒ with a Curie temperature, T C = 386°C. 4 After excellent piezoelectric properties for ͑1 − x͒BiScO 3 -xPbTiO 3 ͑BS-PT͒ near the morphotropic phase boundary ͑MPB͒ ͑x = 0.64͒ were reported ͑piezoelectric coefficient, d 33 = 460 pC/ N, planar coupling coefficient, k p = 0.56, and T C = 450°C͒ recently, 5,6 the discovery of several promising high temperature piezoelectric materials with high performance followed in the general BiMeO 3 -PbTiO 3 system, [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] where Me can be a single cation of valency +3 ͑e.g., Sc 3+ and Fe 3+ ͒ or a mixture of cations with an average valence of +3 ͑e.g., Mg 1/2 Ti 1/2 and Ni 2/3 Nb 1/3 ͒. It has been proposed that the Bi substitution plays an unusual role of considerable enhancement of both Curie temperature ͑T C ͒ and tetragonality ͑c / a͒, which results from a strong coupling between Pb/Bi cations and B-site cations of strong ferroelectric activity, such as Ti, Zn, and Fe.…”

“…Hence, most recent studies have been focusing on nonscandium perovskites. [12][13][14][15][16][17][18][19][20][21][22][23][24] In fact, possible new compositions in BiMeO 3 -PbTiO 3 -based systems are plenty, because B-site Me of BiMeO 3 could be any combination, which gives an average valence of +3. According to the currently available literature, however, the design of BiMeO 3 -PbTiO 3 piezoelectrics faces a significant challenge in that only few systems form a MPB with PbTiO 3 .…”