A phase-field study of domain dynamics in ferroelectric BCT-BZT system
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A phase-eld study of domain dynamics in ferroelectric BCT-BZT system Soumya Bandyopadhyay, Tushar Jogi, Kumaraswamy Miriyala, Ranjith Ramadurai and Saswata Bhattacharyya MRS Advances / FirstView Article / June 2016, pp 1 - 6 DOI: 10.1557/adv.2016.384, Published online: 23 May 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116003844 How to cite this article: Soumya Bandyopadhyay, Tushar Jogi, Kumaraswamy Miriyala, Ranjith Ramadurai and Saswata Bhattacharyya A phase-eld study of domain dynamics in ferroelectric BCT-BZT system. MRS Advances, Available on CJO 2016 doi:10.1557/adv.2016.384 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.384
A phase-field study of domain dynamics in ferroelectric BCT-BZT system. Soumya Bandyopadhyay*1, Tushar Jogi1, Kumaraswamy Miriyala1, Ranjith Ramadurai1, Saswata Bhattacharyya1 1
Department of Materials Science and Metallurgical Engineering, Indian Institute of Technology Hyderabad, Sangareddy, Telangana, India-502285 * Corresponding Author (email address- [email protected]) ABSTRACT We present a thermodynamically consistent phase-field model describing the free energy of perovskite-based BCT-BZT solid solution containing an intermediate morphotropic phase boundaries. The Landau coefficients are derived as functions of composition of zirconium. The electrostrictive and elastic constants are appropriately chosen from experimental findings. The resulting Landau free energy is constructed to describe the stable polarization states as a function of composition. The evolution of the polarization order parameters at a particular composition is described by a set of time-dependent Ginzburg-Landau (TDGL) equations. Additionally, we solve Poisson’s equation and mechanical equilibrium equation to account for the ferroelectric/ferroelastic interactions. We have performed two dimensional and three-dimensional simulations with appropriate electrical boundary conditions to study the effect of external electric field on domain dynamics in BCT-BZT system at the equimolar composition. I. INTRODUCTION The presence of excellent dielectric, piezoelectric, pyro and optoelectronic properties facilitates the use of perovskite-based ferroelectric oxides in numerous applications such as nonvolatile memory devices, nanoelectronics, sensors, actuators, etc. [1, 2]. Ferroelectric systems undergo symmetry breaking phase transitions below a critical temperature leading to a formation of crystallographically related domains in the microstructure. The evolution of domains in these systems is intricately governed by the complex interplay of ferroelastic and ferroelectric interactions which arise due to the presence of the primary ferroic orders in the systems. Moreover the interactions are influenced by the exte
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