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Synthesis of piezoelectric and bioactive N a N b O 3 from metallic niobium and niobium oxide
Author(s) -
Prado da Silva Marcelo Henrique,
da Rocha Daniel Navarro,
de Andrade Gobbo Luciano,
dos Santos Azevedo Luciana Maria,
Louro Luís Henrique Leme,
Machado Costa Andréa,
Brant de Campos José
Publication year - 2016
Publication title -
journal of biomedical materials research part b: applied biomaterials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.665
H-Index - 108
eISSN - 1552-4981
pISSN - 1552-4973
DOI - 10.1002/jbm.b.33453
Subject(s) - niobium , rietveld refinement , materials science , hydrothermal synthesis , niobium oxide , powder diffraction , oxide , scanning electron microscope , hydrothermal circulation , phase (matter) , aqueous solution , alkali metal , crystallography , metal , nuclear chemistry , chemical engineering , inorganic chemistry , crystal structure , chemistry , metallurgy , organic chemistry , composite material , engineering
NaNbO 3 was synthesized by two different routes, one using metallic niobium powder, and another using niobium oxide (Nb 2 O 5 ) powder. In both routes an aqueous sodium hydroxide solution was used to hydrothermally treating the powders. In the first approach, the solution concentrations were 3 M , 1 M , and 0.5 M . The second route used solution concentrations of 10 M and 12.5 M . After the hydrothermal treatments, the powders were heat treated in order to synthesize NaNbO 3 . The products were characterized by scanning electron microscopy (SEM) with energy dispersive spectrometry (EDS), and X‐ray diffraction (XRD) with Rietveld refinement. The phases were identified by means of X‐ray diffraction (XRD) with Rietveld refinement. It was observed that the molar concentrations of the solutions had opposing effects for each route. An antiferroelectric phase was found in both routes. In the niobium metallic route, a ferroelectric phase was also synthesized. This study proves that piezoelectric NaNbO 3 can be obtained after alkali treatment of both Nb and Nb 2 O 5. © 2015 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater, 104B: 979–985, 2016.