Absence of relaxor-like ferroelectric phase transition in (Pb,Sr)TiO3 thin films

Structural transition on Pb1−xSrxTiO3 produced by chemical method

“…Polycrystalline Pb1−xSrxTiO3 (0 ≤ x ≤ 1) (PST) powders were prepared by the complex polymerization method, which provides samples with high composition accuracy and homogeneity [30][31][32]. To prepare the samples, we used commercially available reactants such as lead acetate trihydrate [Pb(CH3COO)2·3H2O] (>99% purity, Aldrich), strontium carbonate (SrCO3) (>98% purity, Aldrich), titanium isopropoxide [Ti(OCH(CH3)3)4] (>97% purity, Alfa Aesar).…”

Mechanochemical Synthesis of Lead Magnesium Niobate Ceramics in Iron Media

“…Such a behavior is typical of PFN ceramics and was already found and explained by some other authors in PMN-PFN systems, [2,13] and also in some thin films. [14] Some authors investigated the influence of pyrochlore on PMN dielectric properties and found that lead magnesium niobate-pyrochlore diphase mixtures retain relaxor properties and a high dielectric constant up to 18 vol pct of pyrochlore and that the dielectric properties are more influenced by microstructure and evolution of the grain boundary phase than by the pyrochlore phase. [15,16] On the other hand, some investigations of the influence of the excess of MgO showed that it could result in a decrease of dielectric properties, [17] although some other researchers obtained better properties with excess MgO.…”

Dielectric and Pyroelectric Properties of (Pb 0.50 Sr 0.50 )TiO 3 Ceramics

“…Some paper have reported the phase transition of the (Pb,Sr)TiO 3 ceramics [6,7] and the structure, dielectric and relaxor-like behaviours of the (Pb 0.5 Sr 0.5 )TiO 3 thin films. [8] However, there are few papers reported on the dielectric properties after poled and the pyroelectric properties of the (Pb,Sr)TiO 3 ceramic system. In this Letter, we describe the dielectric depolarization behaviour and pyroelectric properties of the (Pb 0.50 Sr 0.50 )TiO 3 ceramics.…”

“…[9,10] 200) and (002) of the XRD pattern exhibited its tetragonal symmetry structure with the lattice parameter of c = 3.936 Å, a = 3.910 Å and c/a ratio of 1.007, while the (Pb 0.50 Sr 0.50 )TiO 3 thin films with tetragonal phase. [8,11,12] The temperature dependence of dielectric constants and loss tanδ for the PST ceramics during heating and cooling at 10 kHz are shown in Figs. 2(a) and 2(b).…”

“…The phase transition for unpoled and poled samples were observed at 153 • C and 157 • C, respectively, which is comparable to the value of T m for bulk ceramics [13,14] and that of the corresponding composition thin films (160 • C). [8] Yang et al reported that the phase transition temperature of the (Pb 0.50 Sr 0.50 )TiO 3 thin film with small grains is 140 • C, which is attributed to the grain size effects. [15] .0 µC/cm 2 and 6.0 kV/cm applied electric field of 40 kV/cm, respectively.…”