Abstracts Book - IMRC 2018

• SA6-P028
EFFECT OF DOPANT IN THE MORPHOLOGY, CRYSTAL SIZE AND
PHASES IN BaTiO3 NANOFIBERS
Maria Cristina Maldonado Orozco 1 , Raul Sandoval Jabalera 1 , Perla Cordero 1 , Raúl Acosta
Chávez 1 , Matha Ochoa Lara 2 , Francisco Espinosa Magaña 2,3
1
Universidad Autónoma de Chihuahua, Facultad de Ingeniería, Mexico. 2 Centro de
Investigación en Materiales Avanzados, S.C., Física de Materiales, Mexico. 3 Centro de
Investigación en Materiales Avanzados, S.C., , Mexico.
The present research is based on the synthesis and characterization of pure and
Mn-doped BaTiO3 nanofibers using the electrospinning method, this is a
powerful technique in the fabrication of polymeric and ceramic fibers, followed
by a heat treatment, barium acetate Ba(C2H3O2)2, titanium isopropoxide
Ti[OCH(CH3)2]4, manganese acetate Mn(C2H3O2)2 and polyvinylpyrrolidone (PVP),
were dissolved in ethanol C2H5OH to obtain the precursor solution. This solution
was delivered into a metallic needle at a constant flow rate of 0.3 mL/h by a
syringe pump. The metallic needle was connected to a high-voltage power
supply and a grounded aluminum foil was placed 15 cm the needle tip, where
the as-spun composite is collected. In all cases, the solution was heated at 25°C
with stirring for almost 2 hours. Pure nanofibers were synthesized and doped
with different concentrations of Mn (x=2.5, 5 and 10% mol), achieving different
types of morphologies, diameters and lengths. After annealing at 850 °C, we
obtain nanofibers a few µm long, formed by nanoparticles of irregular shape
with sizes around 100 nm. Cylindrical and randomly oriented fibers were
obtained with varying diameters tens to hundreds of nm, being the sample with
x=0.10 the one with smaller diameter. The diffraction pattern for BaTiO3
nanofibers shows that we reached the desired structure, whereas for Mn-doped
BaTiO3, the diffraction patterns show additional peaks at 2θ=26, 37, 41, 49 and
53°, which are associated with the hexagonal structure of barium titanate (h-
BaTiO3) and not to the tetragonal structure, these peaks are clearly observed for
the doped structure with x = 10%, but hardly seen for the structure with x=5%.
The characterization of the nanofibers was performed following sequence: In
order to determine the annealing temperature to reach the desired BaTiO3 and
BaTi1-xMnxO3 compounds, the thermal stability of as-spun composites were
analyzed by thermogravimetry-differential scanning calorimetry (TGA–DSC).
Morphology and microstructural characterization of calcined nanofibers were
performed by X-ray diffraction (XRD) measurements, Field-emission scanning