Preparation and Curie Temperatures of Nanosized (Pb,Sr)TiO₃ Powders

Abstract

Nanosized perovskite lead strontium titanate (Pb x Sr1-x )TiO3 (PST) powders were successfully prepared by a simple coprecipitation method. A lead-strontium titanyl oxalate (PSTO) precursor was first synthesized at room temperature and the precursor was then calcined at various temperatures to produce the PST powders ranging from 10 to 200 nm in size. The effects of PST particle size on Curie temperature and dielectric constant have been investigated. High-temperature X-ray diffraction results showed that the Curie temperature of Pb0.7Sr0.3TiO3 powder with a size of 10 nm decreased from 290 to 120–130°C.

Effects of accumulated laser pulses on (Pb,Sr)TiO3 films post-excimer laser annealed at low temperatures

“…6 shows the GIXRD pattern of PSrT films unirradiated and post-ELA with various numbers of laser pulses. The diffraction peaks are indexed as (1 0 0), (1 1 0), (2 0 0) and (2 1 1) planes of (Pb 1Àx Sr x )TiO 3 perovskite structure [2][3][4][5][6]19]. The intensity of (2 0 0) orientation is composed of (2 0 0) PSrT and (2 0 0) Pt peaks.…”

“…(Pb,Sr)TiO 3 (PSrT) is one of the feasible ferroelectric materials for memory, sensor, frequency tuning devices and microwave applications because of its large electric-field-dependent dielectric constant and composition-dependent Curie temperature [2][3][4][5][6][7]. The PSrT film is constituted by a solid solution of PbTiO 3 (PTO) and SrTiO 3 (STO).…”

“…As a result, PTO and STO films, at room temperature, exhibit a tetragonal structure (ferroelectric phase) and a cubic structure (paraelectric phase), respectively. The effects of lead (Pb) substituted by strontium (Sr) in the PTO film decrease the crystallization temperature and offer a good control of the dielectric properties at room temperature [2,3].…”

Synthesis and Characterization of Ferroelectric Lead-Based Perovskite Nanoparticles

“…We prepared three composition samples Pb 0.9 Ca 0.1 TiO 3 (PCT9/1), Pb 0.7 Ba 0.3 TiO 3 (PBT7/3), and Pb 0.5 Ba 0.5 TiO 3 (PBT5/5) by coprecipitation method. This method is effective to synthesize ferroelectric nanoparticles with low size distribution [5]. Preparation procedure is introduced briefly.…”

Ferroelectricity and negative temperature coefficient of resistance in pulsed-laser-deposited (Pb,Sr)TiO3 films

“…The T c of PSrT can be linearly adjusted from −220 to 490 • C by varying the lead (Pb) content [9,10]. It is established that Pb substituted by strontium (Sr) in the PTO film will decrease the crystallization temperature at room temperature [11,12]. The TCR effect of the PSrT bulk prepared by conventional ceramic solid state sintering processes has been reported [2][3][4][5][6].…”