Pressure driven ferroelectric to paraelectric transition in Sr doped BaTiO3

Abstract

High pressure Raman spectroscopy, X-ray diffraction, and dielectric measurements have been carried out in Ba1−xSrxTiO3 (x = 0.05 and 0.1). Detailed structural analysis revealed a single phase transition from tetragonal P4mm to cubic Pm3m symmetry. Increase in Sr ion concentration resulted in decrease in the phase transition pressure. The dielectric measurements showed considerable lowering of transition pressure which has been attributed to bulk behaviour of the material.

High‐pressure structural investigation on lead‐free piezoelectric 0.5Ba(Ti0.8Zr0.2)O3 ‐ 0.5(Ba0.7Ca0.3)TiO3

“…It can be referred as octahedral breathing mode (A 1g ), that become Raman active for the presence of several dissimilar ions in the complex perovskite solid solution. 37,42 It can be seen from Figure 3A that with pressure, the dip around 130 cm −1 reduces, and similar observation has also been found by Basu et al 28 The reason behind this can be the increase in anharmonic contributions of all the low-frequency modes that is evident from Figure 3A. However, all the modes broaden and their frequencies increase with pressure, anomalous behavior is observed for A 1 (TO 2 ) mode at 245 cm −1 and E(TO 4 ) + A 1 (TO 3 ) mode at 525 cm −1 .…”

“…The volume compression can lead to change in internal strain giving rise to several changes in the physical properties of the material leading to novel phase transitions that may include structural, electronic transitions etc. [27][28][29] BCZT, which is a solid solution of BZT-BCT, hold all the properties of its parent material BaTiO 3 along with the effect of doping on it. Therefore, the present manuscript focuses on high-pressure Raman spectroscopy, x-ray diffraction, and dielectric measurements of BCZT to study phase transitions, which modify its dielectric properties and piezoelectric nature.…”

High Pressure Experimental Studies on CuO: Indication of Re-entrant Multiferroicity at Room Temperature

“…All the observed XRD peaks are indexed to monoclinic structure with space group C 2/ c and unit cell parameters: a 0 = 4.6946(3), B 0 = 3.4182(2), c 0 = 5.1329(3) Å, V 0 = 81.202(7) Å 3 , β 0 = 99.65(4) 0 , which are in good agreement with the literature 14 . High pressure dielectric constant ( ), dielectric loss ( δ ( P )) and electrical resistance ( R ( P )) measurements are carried out with a GW Instek make Precision LCR Meter, Model–800G using a Toroid anvil (TA) apparatus 39 40 up to about 9 GPa. The TA apparatus is pressure calibrated using Bi I – II and Yb hcp – bcc transitions at 2.65 GPa and 4 GPa respectively.…”

Quantitatively Analyzing Pressure Induced Phase Transformation by Photoluminescence Spectra in Eu3+-doped Sodium Potassium Bismuth Titanate

“…Piezoelectric material has been widely applied in numerous electromechanical devices. In fact, piezoelectric material usually works under mechanical pressures [1], thus, some researchers concentrate on the effects of mechanical pressures on piezoelectric material [2][3][4][5][6][7]. For example, Yao et al reported that the piezoelectric coefficient decreases with increasing the mechanical pressures in the PbTiO 3 -based piezoelectric ceramic, which was further explained by the pressure-induced depolarization [4].…”

“…For example, Yao et al reported that the piezoelectric coefficient decreases with increasing the mechanical pressures in the PbTiO 3 -based piezoelectric ceramic, which was further explained by the pressure-induced depolarization [4]. Pressure induced phase transformations are also reported widely [5][6][7][8][9]. Hall et al suggested a phase transformation from the rhombohedral to the orthorhombic phase within the PbZrO 3 -PbTiO 3 piezoelectric ceramic, induced by pressure [3].…”