Crystal growth and characterization of lead-free based Cu-doped K0.48Na0.52NbO3 fibers by micropulling- down
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2016
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BRAZILIAN MRS MEETING, 15th
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Lead zirconate titanate (PZT) ceramics are extensively used in piezoelectric
transducer devices due its good piezoelectric properties and high Curie
temperature. However, because of the toxicity of Pb element, it is necessary the
development of new piezoelectric compositions with the similar electrical
characteristics. In addition, it is well-known that piezoelectric single crystals
present much better electrical properties than their counterpart ceramics. Among
the most promising lead-free materials for piezoelectric applications sodium
potassium niobate (KNN) is considered a potential candidate to replace the PZT
compounds [1]. In this work undoped and Cu-doped KNN single crystal fibers
with compositions near the morphotropic phase boundary (MPB) were grown by
the micro-pulling-down technique (μ-PD) under three different atmospheres
atmosphere: air, oxygen and argon. The μ-PD technique is a promising route
because it allows obtaining crystals in a short period of time by using a reduced
amount of raw materials [2]. It was verified that experimental parameters such as
nozzle geometry, crucible features, temperature gradient and pulling rate were
crucial for the growing of the crystals. Furthermore, it was also noticed that the
atmosphere had an important impact on the crystal quality. Despite the
challenges, pure and Cu-doped KNN crystals were grown and their dielectric and
piezoelectric properties were investigated. Our results demonstrated that the μ-PD method is suitable for growing good KNN crystals for technological
applications.
Como referenciar
SILVA, MARCUS V.; SANTO, ANA M. do E.; BALDOCHI, SONIA L.; EIRAS, JOSE A.; LENTE, MANUEL H. Crystal growth and characterization of lead-free based Cu-doped K0.48Na0.52NbO3 fibers by micropulling- down. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... p. 680. Disponível em: http://repositorio.ipen.br/handle/123456789/27344. Acesso em: 30 Dec 2025.
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