Artigo de peri??dico
Production and characterization of (K Na)(Nb Cu)O3 crystal fibers grown by micro-pulling-down method
Registro en:
0015-0193
1
545
SI
10.1080/00150193.2019.1621693
0000-0003-1502-1616
9.089
17.00
Autor
SILVA, M.V.S.
SANTO, A.M.E.
BALDOCHI, S.L.
GON??ALVES, A.M.
EIRAS, J.A.
LENTE, M.H.
Resumen
Cu-doped sodium potassium niobate single crystal fibers (KNN-Cu)
were grown by the micro-pulling-down technique under different
atmospheres, namely, argon, synthetic air and oxygen. The structural
analysis revealed that all fibers were grown in the perovskite phase
with no secondary phase. In comparison with the precursors powders,
the results from EDX showed no significative chemical changes,
suggesting that monocrystalline and stoichiometric KNN-Cu fibers
were produced. The ferroelectric phase transitions characterized by
thermal strain measurements corroborated this assumption. The
dielectric results showed that the fibers produced under synthetic air
presented the best results. Piezoresponse measurements revealed
domains with typically orthorhombic symmetry morphology. Conselho Nacional de Desenvolvimento Cient??fico e Tecnol??gico (CNPq) CNPq: 163761/2017-5