Dielectric and Raman Spectroscopic Studies of Na0.5Bi0.5TiO3–BaSnO3 Ferroelectric System. Issue 6 (4th February 2014)

• Record Type: Journal Article
• Authors: Tripathy, Satya Narayan; Mishra, Karuna Kara; Sen, Shrabanee; Pradhan, Dillip K.; Roedel, J.
• Is Part Of: Journal of the American Ceramic Society. Volume 97:Issue 6(2014)
• Page Start: 1846
• Page End: 1854
• Publication Date: 2014-02-04
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12838
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" id="jace12838-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>A series of lead‐free perovskite solid solutions of (1 − <italic>x</italic>) Na_0.5Bi_0.5TiO₃(NBT)—<italic>x </italic>BaSnO₃(BSN), for 0.0 ≤ <italic>x</italic> ≤ 0.15 have been synthesized using a high‐temperature solid‐state reaction route. The phase transition behaviors are studied using dielectric and Raman spectroscopic techniques. The ferroelectric to relaxor phase transition temperature (<italic>T</italic>_FR) and the temperature corresponding to maximum dielectric permittivity (<italic>T</italic>_m) are estimated from the temperature‐dependent dielectric data. Dielectric studies show diffuse phase transition around ~335°C in pure NBT and this transition temperature decreases with increase in <italic>x</italic>. The disappearance of <italic>x</italic>‐dependence of A₁ mode frequency at ~134 cm⁻¹ for <italic>x</italic> ≥ 0.1 is consistent with rhombohedral‐orthorhombic transition. <italic>In situ</italic> temperature dependence Raman spectroscopic studies show disappearance and discontinuous changes in the phonon mode frequencies across rhombohedral (<italic>x</italic> &lt; 0.1)/orthorhombic (<italic>x</italic> ≥ 0.1) to tetragonal transition.</p> </abstract>