Characterization of dense lead lanthanum titanate ceramics prepared from powders synthesized by the oxidant peroxo method

Content Provider	Semantic Scholar
Author	Pinto, Alexandre H. Souza, Flavio L. Chiquito, Adenilson José Longo, Elson Leite, Edson Roberto Camargo, Emerson Rodrigues
Copyright Year	2010
Abstract	Abstract Nanosized powders of lead lanthanum titanate (Pb1−xLaxTiO3) were synthesized by means of the oxidant-peroxo method (OPM). Lanthanum was added from 5 to 30% in mol through the dissolution of lanthanum oxide in nitric acid, followed by the addition of lead nitrate to prepare a solution of lead and lanthanum nitrates, which was dripped into an aqueous solution of titanium peroxo complexes, forming a reactive amorphous precipitate that could be crystallized by heat treatment. Crystallized powders were characterized by FT-Raman spectroscopy and X-ray powder diffraction, showing that tetragonal perovskite structure is obtained for samples up to 25% of lanthanum and cubic perovskite for samples with 30% of lanthanum. Powders containing 25 and 30% in mol of lanthanum were calcined at 700 °C for 2 h, and in order to determine the relative dielectric permittivity and the phase transition behaviour from ferroelectric-to-paraelectric, ceramic pellets were prepared and sintered at 1100 or 1150 °C for 2 h and subjected to electrical characterization. It was possible to observe that sample containing 25% in mol of La presented a normal behaviour for the phase transition, whereas the sample containing 30% in mol of La presented a diffuse phase transition and relaxor behaviour.
Starting Page	1051
Ending Page	1056
Page Count	6
File Format	PDF HTM / HTML
DOI	10.1016/j.matchemphys.2010.08.030
Volume Number	124
Alternate Webpage(s)	http://www.cmdmc.com.br/redecmdmc/lab/arquivos_publicacoes/3459_Characterization%20of%20dense%20lead%20lanthanum%20titanate%20ceramics%20prepared%20from.pdf
Alternate Webpage(s)	https://doi.org/10.1016/j.matchemphys.2010.08.030
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article