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Compositional induced structural phase transitions in (1 � x)(K0.5Na0.5)NbO3�x(Ba0.5Sr0.5)TiO3 ferroelectric solid solutions

Sahoo, S and Pradhan, DK and Kumari, S and Samantaray, KS and Singh, C and Mishra, A and Rahaman, MM and Behera, B and Kumar, A and Thomas, R and Rack, PD and Pradhan, DK (2023) Compositional induced structural phase transitions in (1 � x)(K0.5Na0.5)NbO3�x(Ba0.5Sr0.5)TiO3 ferroelectric solid solutions. In: Scientific Reports, 13 (1).

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Official URL: https://doi.org/10.1038/s41598-023-45713-z


Ferroelectric materials exhibiting switchable and spontaneous polarization have strong potential to be utilized in various novel electronic devices. Solid solutions of different perovskite structures induce the coexistence of various phases and enhance the physical functionalities around the phase coexistence region. The construction of phase diagrams is important as they describe the material properties, which are linked to the underpinning physics determining the system. Here we present the phase diagram of (K0.5Na0.5NbO3)�(Ba0.5Sr0.5TiO3) (KNN-BST) system as a function of composition and their associated physical properties. Lead-free (1 � x)KNN�xBST (0 � x � 0.3) solid solution ceramics were synthesized by conventional solid-state reaction technique. The X-ray diffraction and Raman spectroscopic studies indicate composition-dependent structural phase transitions from an orthorhombic phase for x = 0 to orthorhombic + tetragonal dual-phase (for 0.025 � x � 0.15), then a tetragonal + cubic dual-phase (x = 0.2) and finally a cubic single phase for x � 0.25 at room temperature (RT). Among these, the orthorhombic + tetragonal dual-phase system shows an enhanced value of the dielectric constant at room temperature. The phase transition temperatures, orthorhombic to tetragonal (TO-T) and tetragonal to cubic (TC), decrease with the increase in BST concentrations. The ferroelectric studies show a decrease of both 2Pr and EC values with a rise in BST concentration and x = 0.025 showed a maximum piezoelectric coefficient. © 2023, The Author(s).

Item Type: Journal Article
Publication: Scientific Reports
Publisher: Nature Research
Additional Information: The copyright for this article belongs to author.
Keywords: article; ceramics; dielectric constant; phase transition; Raman spectrometry; room temperature; solid state; X ray diffraction
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 28 Feb 2024 11:53
Last Modified: 28 Feb 2024 11:53
URI: https://eprints.iisc.ac.in/id/eprint/83642

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