Structural Effects on Perovskite Phase Formation for PZT Powders Obtained by Polymeric Precursor Method

Many synthesis methods are available to obtain a set of specific characteristics for lead zirconate titanate (PZT) piezoelectric ceramic powders. In this work, we have successfully prepared PZT powder samples through the Polymeric Precursor Method with x = 0.6, according the general formula Pb (ZrxTi1-x)O3. The powders were thermally treated from 380 to 550 oC and characterized by Raman spectroscopy and X-ray diffraction (DRX) in order to evaluate the effects of thermal treatment on the phase formation and the crystallization processes. The results obtained by Raman spectroscopy were compared to refined crystal data obtained by Rietveld method, leading to coherent conclusions about the structural effects occurring along the temperature of calcination. It was possible to characterize the tetragonal perovskite phase as predominant phase occurs only after 500 oC, but its crystallinity is already determined by synthesis method. Thus, no ordering process is verified for perovskite as a function of the temperature increasing during thermal treatment, in spite of the continuous pyrochlore-to-perovskite phase transition. The pyrochlore secondary phase starts to vanish before its proper crystallization process, changing the tetragonality of previously formed perovskite phase.

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Effect of Thermal Treatment on the Morphology of PLZT Thin Films Prepared from Polymeric Precursor Method

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.189-191.155 ◽

2001 ◽

Vol 189-191 ◽

pp. 155-160 ◽

Cited By ~ 1

Author(s):

A.H.M. González ◽

A.Z. Simões ◽

José Arana Varela ◽

M.A. Zaghete ◽

Elson Longo

Keyword(s):

Thin Films ◽

Thermal Treatment ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method ◽

Plzt Thin Films

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Effect of Iron and Vanadium on the Phase Transition of Titanium Dioxide Obtained by Polymeric Precursor Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.881.18 ◽

2016 ◽

Vol 881 ◽

pp. 18-23

Author(s):

Eduardo Felipe de Carli ◽

Maycon dos Santos ◽

Natali Amarante da Cruz ◽

Daniela Cristina Manfroi ◽

Jusinei Meireles Stropa ◽

...

Keyword(s):

Phase Transition ◽

Titanium Dioxide ◽

Phase Formation ◽

Anatase Phase ◽

Synthesis Method ◽

Rutile Phase ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method ◽

Powder Samples

The titanium dioxide phase formation is dependent on the synthesis method, temperature of calcination and modifiers insertion. By using chemical methods, such as Polymeric Precursor Method, the organic impurities or extrinsic defects caused by doping play an important rule on the formation of precursor structure before the phase crystallization above 500 oC. Some dopants can change the decomposition mechanism of the precursor, which affects the anatase-rutile phase transition. In this work, the Polymeric Precursor Method was used to synthesize titanium dioxide powder samples in order to investigate the effects of iron (III) and vanadium (V) dopants on the phase formation. Through thermal analysis of polymeric precursors and X-ray diffractometry for calcined powder samples it was possible to show the existence of antagonistic effects for both investigated dopants. While the iron doping reduces the anatase phase tetragonality and delays the rutile phase conversion, the vanadium one changes the mechanism of decomposition of polymeric precursor and leads to more amount of rutile phase.

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Effect of Thermal Treatment Temperature on the Crystallinity and Morphology of LiTaO3 Thin Films Prepared from Polymeric Precursor Method

Journal of Electroceramics ◽

10.1007/s10832-004-5125-8 ◽

2004 ◽

Vol 13 (1-3) ◽

pp. 353-359 ◽

Cited By ~ 8

Author(s):

A. H. M. Gonz�lez ◽

A. Z. Sim�es ◽

M. A. Zaghete ◽

E. Longo ◽

J. A. Varela

Keyword(s):

Thin Films ◽

Thermal Treatment ◽

Treatment Temperature ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method ◽

Thermal Treatment Temperature

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Mechanisms of phase formation along the synthesis of Mn–Zn ferrites by the polymeric precursor method

Ceramics International ◽

10.1016/j.ceramint.2014.07.137 ◽

2014 ◽

Vol 40 (10) ◽

pp. 16023-16031 ◽

Cited By ~ 9

Author(s):

Murillo L. Martins ◽

Ariovaldo O. Florentino ◽

Alberto A. Cavalheiro ◽

Rafael I.V. Silva ◽

Dayse I. Dos Santos ◽

...

Keyword(s):

Phase Formation ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method

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Synthesis of Nickel-Silica Nanocomposite Embedded in Amorphous Carbon through the Polymeric Precursor Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.881.453 ◽

2016 ◽

Vol 881 ◽

pp. 453-458

Author(s):

Igor Silva de Sá ◽

Eliane Kujat Fischer ◽

Graciele Vieira Barbosa ◽

Tiziana Azario de Medeiros ◽

Margarete Soares da Silva ◽

...

Keyword(s):

Amorphous Carbon ◽

Metallic Nanoparticles ◽

Nickel Nanoparticles ◽

Metallic Nickel ◽

High Dispersion ◽

Synthesis Methods ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Precursor Method ◽

Silica Nanocomposite

The direct synthesis methods such as Polymeric Precursor Method can be used as direct route for the synthesis of ceramic-metal composites with high dispersion of metallic nanoparticles. The control of the polymer decomposition in order to avoid the organic matter combustion permits the pyrolysis occurrence, which originates the metallic phase embedded in the ceramic matrix. In this work, a nickel-silica nanocomposite in additional amorphous carbon interphase was successfully obtained through the Polymeric Precursor Method. It was observed by Transmission Electronic Microscopy that metallic nickel nanoparticles nucleate with sizes from 10 to 50 nm inside the mesopore matrix composite. The analysis of Nitrogen Adsorption-Desorption Isotherms for samples pyrolysed at several times showed the existence of two sizes of mesopores, one with diameter of 3.8 nm, associated to the silica-carbon matrix and other above 10 nm, associated to the meso and macropores containing nickel nanoparticles.

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Physical Characterization of K-Doped 0.9PMN-0.1PT Synthesized by an Association of the Columbite Route and the Polymeric Precursor Method

Materials Science Forum ◽

10.4028/www.scientific.net/msf.498-499.669 ◽

2005 ◽

Vol 498-499 ◽

pp. 669-675

Author(s):

A.A. Cavalheiro ◽

Juliana C. Bruno ◽

M.A. Zaghete ◽

José Arana Varela

Keyword(s):

Grain Size ◽

Perovskite Phase ◽

Rietveld Method ◽

Size Control ◽

Xrd Analysis ◽

Polymeric Precursor Method ◽

Polymeric Precursor ◽

Structural Refinement ◽

Precursor Method ◽

Columbite Precursor

The solid solution 0.9PbMg1/3Nb2/3O3-0.1PbTiO3 is one of the most widely investigated relaxor ceramic, because of its high dielectric constant and low sintering temperatures. PMN-PT powders containing single perovskite phase were prepared by using a Ti-modified columbite precursor obtained by the polymeric precursor method. Such precursor reacts directly with stoichiometric amount of PbO to obtain pyrochlore-free PMNPT powders. The structural effects of K additive included in the columbite precursor and 0.9PMN-0.1PT powders were also studied. The phase formation at each processing step was verified by XRD analysis, being these results used for the structural refinement by the Rietveld method. It was verified the addition of K in the columbite precursor promotes a slight increasing in the powder crystallinity. There was not a decrease in the amount of perovskite phase PMN-PT for 1mol% of K, and the particle and grain size were reduced, making this additive a powerful tool for grain size control.

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