Ferroelectric BaTiO3 single crystal under superstrong electric fields up to 55 MV/m: A comparative experimental and theoretical study

Abstract

We investigated the effect of huge electric field up to E=55 MV/m on tetragonal ferroelectric phase of BaTiO3 single crystal. Both lattice parameters and the dielectric susceptibility along the polar axis were determined. The induced polarization shows a continuous increase up to 20% of the spontaneous polarization. The longitudinal d33 and transverse d31 piezoelectric coefficients were also determined. The experimental data are described by a phenomenological approach. Interestingly, an intermediate critical electric field value of E∼25 MV/m was evidenced suggesting that the physics below and above this value are different.

A new higher-order Landau–Ginzburg–Devonshire theory for KNbO3 crystal

“…We will add two tenth order invariants 2 13 JJ and 23 JJ to the model (15) for qualitative and quantitative description of the recent experimental data 27,33 on BaTiO 3 . We then obtain the following potential: 2 3 1 1 11 1 2 2 111 1 3 3 12 1 2 4 2 2 2 1111 1 112 1 2 22 2 13 1 3 113 1 3 23…”

“…The experimental data on the cubic-tetragonal phase transition temperature, spontaneous polarization 33 , dielectric constant 27 and piezoelectric coefficients 27 In Table II, we list values of the expansion coefficients of the higher Landau-Devonshire potential model (16).…”

“…Having compared the experimental data on the spontaneous polarization, dielectric constant and piezoelectric coefficients under superstrong electric field value up to 55MV/m with the results of the phenomenological Landau-Devonshire approach, I. B. Leontyev et al 27 showed that either the potential model by Bell et al 6 or one by Li et al 7 explains better his experimental data than Y. L. Wang's one.…”

X‐Ray Diffraction and Dielectric Investigations of Ferroelectric PbZr0.958Ti0.042O3, Antiferroelectric PbZrO3 and PbHfO3 Single Crystals in Superstrong Electric Fields up to 30 MV/m

“…Recently, numerous attempts were made to elucidate the nature of phase transitions in ABO 3 perovskites in severe electric fields up to 10 8 V/m both theoretically and experimentally, via such techniques, as optic microscopy, X‐ray diffraction (XRD), EXAFS spectroscopy, Raman spectroscopy and EPR . However, only a few communications report the structural parameter variations in single‐phase states under the electric fields far of the excess coercive field. According to XRD and dielectric data in, applying severe electric fields favors a gain in polarization by 20% and a decrease in the piezoelectric coefficients by about 2.5 times.…”

“…However, only a few communications report the structural parameter variations in single‐phase states under the electric fields far of the excess coercive field. According to XRD and dielectric data in, applying severe electric fields favors a gain in polarization by 20% and a decrease in the piezoelectric coefficients by about 2.5 times. The results are in coincidence with a phenomenological Landau–Ginzburg–Devonshire approach.…”