期刊
BULLETIN OF MATERIALS SCIENCE
卷 43, 期 1, 页码 -出版社
INDIAN ACAD SCIENCES
DOI: 10.1007/s12034-020-02246-9
关键词
Ferroelectrics; solid-state reaction; piezoelectrics; lead-free materials
资金
- National Council of Scientific and Technical Research (CONICET)
- National Agency for Scientific and Technological Promotion (ANPCyT) [PICT2014-1314]
- National University of Mar del Plata (UNMdP) [15/G527]
- MINECO (Spain) [MAT2017-86450-C4-1-R]
- MINECO - European Social Fund [RyC-2015-18626]
- 2018 Leonardo Grant for Researchers and Cultural Creators, BBVA Foundation
In this work, piezoceramics of (1-x)(Bi0.5Na0.5)TiO3-x(K0.5Na0.5)NbO3, (1-x)BNT-xKNN, in the compositional range 0.00 <= x <= 0.07, were prepared by a mechanochemically activated solid-state method. The structural phase formation and microstructural, dielectric, and ferroelectric properties were studied. Although changes, in symmetry of the perovskite structure, were not detected with the composition (i.e., from a perspective of its intrinsic properties), the microstructural evolution was strongly dependent on the content of the KNN phase (i.e., based on its extrinsic properties). Specifically, KNN favoured the formation of a microstructure with cubic grains, typical morphology of the alkaline niobate ceramics. After KNN addition, both the maximum permittivity temperature and the long-range to short-range ordered transition temperature were reduced. Additionally, ferroelectric loops and strain deformation curves also reflect the long-range to short-range order evolution with KNN addition and temperature.
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