Thermally-induced local structural transformations in Na0.5Bi0.5TiO3-KNbO3 ceramics

Ge Wang, Anton Goetzee-Barral, Zhilun Lu, Dean Keeble, David Hall

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Abstract

The local symmetry of (1-x)Na0.5Bi0.5TiO3-xKNbO3 (NBT-xKN, x=0.01-0.07) ceramics was thoroughly examined using high-energy synchrotron x-ray scattering and analysed using the Pair-Distribution Function (PDF) method. At room temperature, the structure of NBT-xKN (x=0.01-0.07) ceramics was best refined using monoclinic C1c1 structures within the local-range (r<22 Å) and rhombohedral R3c within medium-range (22 Å <r <52 Å). Furthermore, the local monoclinic C1c1 structure exists from room temperature to > 420 °C (above the temperature of the maximum dielectric peak, Tm), as confirmed by in-situ temperature-dependent PDF analysis.
Original languageEnglish
JournalJournal of the American Ceramic Society
DOIs
Publication statusPublished - 27 Jan 2021

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