title: Core-shell grain structures and ferroelectric properties of Na0.5K0.5NbO3-LiTaO3-BiScO3 piezoelectric ceramics.
abstract: Legislation arising from health and environmental concerns has intensified research into finding suitable alternatives to lead-based piezoceramics. Recently, solid solutions based on sodium potassium niobate (K,Na)NbO3 (KNN) have become one of the globally-important lead-free counterparts, due to their favourable dielectric and piezoelectric properties. This data article provides information on the ferroelectric properties and core-shell grain structures for the system, (1-y)[(1-x)Na0.5K0.5NbO3 - xLiTaO3] - yBiScO3 (x=0-0.1, y=0.02, abbreviated as KNN-xLT-2BS). We show elemental analysis with aid of TEM spot-EDX to identify three-type grain-types in the KNN-LT-BS ternary system. Melting behaviour has been assessed using a tube furnace with build-in camera. Details for the ferroelectric properties and core-shell chemical segregation are illustrated.
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China ; Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK.
authors.forename: Fangyuan
authors.initials: F
authors.lastname: Zhu
authors.affiliation: Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK.
authors.forename: Michael B
authors.initials: MB
authors.lastname: Ward
authors.affiliation: State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.
authors.forename: Jing-Feng
authors.initials: JF
authors.lastname: Li
authors.affiliation: Institute for Materials Research, University of Leeds, Leeds LS2 9JT, UK.
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Milne
keywords: Core–shell structure; Ferroelectric; Lead-free; Melting; NKN-based; TEM