Synthesis of nanocrystalline ytterbium modified PbTiO3

Lemos, F. C. D.; Longo, Elson; Leite, E. R.; Melo, D.M.A.; Silva, A.O

doi:10.1016/j.jssc.2003.12.005

Cited by 16 publications

(7 citation statements)

References 21 publications

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“…A partir de 400 ºC a estrutura tetragonal para o PT e os pós cerâmicos de PYT e PYbT dopados com 1% foi obtida, enquanto que os pós dopados com 5 e 7% apresentaram-se polifásicos, os quais com o aumento da temperatura de tratamento térmico favoreceu a formação da fase perovskita. A formação de fases intermediárias durante a síntese dos pós cerâmicos de PT dopados com terras raras é mencionada na literatura por vários autores [15][16][17]. Em nossos resultados as fases de raios X para os pós de PT puro e dopados, PYT e PYbT, tratados a várias temperaturas são apresentados nas Figs.…”

Section: Resultsunclassified

Comportamento térmico do PbTiO3 modificado por terras raras

et al. 2005

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Titanatos de chumbo dopados com itérbio e ítrio, PYbT e PYT foram preparados pelo método Pechini. Os materiais obtidos foram calcinados sobre fluxo de oxigênio em diferentes temperaturas e investigados utilizando-se as técnicas de difração de raios X (DRX), microscopia eletrônica de varredura (MEV) e espectroscopia na região do infravermelho (IV). O comportamento térmico de PbTiO3 dopados com itérbio e ítrio é descrito através de curvas termogravimétricas (TG) e análise térmica diferencial (ATD). Os resultados revelaram que a fase perovskita foi obtida em uma baixa temperatura e que o aumento da dopagem favorece a estabilidade térmica dos materiais obtidos.

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Section: Resultsunclassified

Comportamento térmico do PbTiO3 modificado por terras raras

et al. 2005

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“…The powder samples obtained by Pechini method, detailed elsewhere [8,9,18], was evaluated by X-ray diffraction using Cuk radiation in a Shimadzu 600 apparatus …”

Section: Methodsmentioning

confidence: 99%

“…In this work, a series of REPT (with 1, 5 and 7 at.% substitution of lead atoms and RE = Yb, Y) powder samples was prepared by the Pechini method [17]. We have studied the characterization of pure and Yb-doped PT (5 at.%) [18] and the results revealed that the obtained materials are formed by nanometric particles and the effect of Ybdoping concentration was also investigated; in particular, it was shown that the perovskite single phase formation was PT, respectively. The aim of the present work is study the morphological properties of the obtained REPT powders at the above mentioned concentrations.…”

Section: Introductionmentioning

confidence: 99%

Structural and morphological characterization of rare earth modified lead titanate

Lemos¹,

Melo²,

Lima³

et al. 2007

Cerâmica

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“…Sirera and Calzada [18], upon obtaining pure and doped PT powders, observed the emergence of a pyrochlore phase which disappeared with the increase of the treatment temperature. Several methods have been used to obtain lead titanate powders, such as high-energy milling [7], solgel method [19][20][21][22], co-precipitation [23] and hydrothermal synthesis [24], besides the traditional solid state reaction of mixed oxides [25]. In this work, we have suggested trimesic acid for the first time as an appropriate and fine chelate agent for the synthesis of PbTiO 3 nanoparticles using sol-gel method.…”

Section: Introductionmentioning

confidence: 99%

“…Among these nanostructured materials, it was found that lead titanate ferroelectric material (PbTiO 3 ) is a good pyroelectric and piezoelectric [6]. PbTiO 3 (PT) with tetragonal perovskite structure at room temperature is a ferroelectric compound with Curie temperature of 490°C, high pyroelectric coefficient, high spontaneous polarization, and low dielectricconstant [7]. In its tetragonal form the c/a is 51.064.…”

Section: Introductionmentioning

confidence: 99%

Novel sol–gel method for synthesis of PbTiO3 and its light harvesting applications

Sobhani‐Nasab

Rangraz-Jeddy

Avanes

et al. 2015

J Mater Sci: Mater Electron

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A novel two-step sol-gel method was used in order to synthesize PbTiO 3 nanoparticles with aid of Pb(CH 3 COO) 2 Á2H 2 O, and Ti(OC 4 H 9 ) 4 (TNBT) as the starting reagents in the presence of ethanol as the solvent. To the best of authors knowledge, it is first time that benzene-1,3,5-tricarboxylic acid [C 6 H 3 (COOH) 3 ] (trimesic acid) use as a chelate agent in produce lead titanate nanoparticles. Besides, to examine the effect of some reaction parameters such as surfactants, reaction temperature, and molar ratio of TNBT to trimesic acid on the morphology and chemical structure of final products several tests were performed. The as-synthesized PbTiO 3 nanoparticle was utilized as photo-anode material for the fabrication of FTO/PbTiO 3 /CdS/Pt-FTO and photocatalyst for decolonization of rhodamine-B (RhB) and methylene blue (MB) to investigation its light harvesting applications. Furthermore, according to the XRD results, only in the presence of trimesic acid as the chelate agent pure PbTiO 3 nanoparticle was synthesized. The photocatalyst results reveal that the maximum decolorization of 88 and 82 % for RhB and MB occurred with PbTiO 3 nanoparticles catalyst in 40 min of stirring under ultraviolet light irradiation, respectively.

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Synthesis of nanocrystalline ytterbium modified PbTiO3

Cited by 16 publications

References 21 publications

Comportamento térmico do PbTiO3 modificado por terras raras

Comportamento térmico do PbTiO3 modificado por terras raras

Structural and morphological characterization of rare earth modified lead titanate

Novel sol–gel method for synthesis of PbTiO3 and its light harvesting applications

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