Coprecipitation method for the preparation of nanocrystalline ferroelectric CaBi2Ta2O9

Gaikwad, S.P.; Dhesphande, S.B.; Khollam, Y. B.; Samuel, V.; Ravi, V.

doi:10.1016/j.matlet.2004.07.004

Cited by 32 publications

(8 citation statements)

References 12 publications

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“…The morphology and the chemical composition of the prepared powder can be efficiently controlled by chemical methods such as coprecipitation, sol-gel, hydrothermal and colloid emulsion technique [16].…”

Section: Introductionmentioning

confidence: 99%

Tialite formation from its quasi-amorphous stoichiometric co-precipitated powder by thermal spray process

Camaratta

Zimmer

Bergmann

2009

Surface and Coatings Technology

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In this work, the formation of tialite from powders obtained by the co-precipitation method with inorganic salts was investigated. For the co-precipitation process, a solution of aluminum nitrate (Al(NO 3 ) 3 9H 2 O) and titanium tetrachloride (TiCl 4 ) in ethyl alcohol was co-precipitated with an increase in ammonium hydroxide base. Phase transformations of the quasi-amorphous dried gel with stoichiometric composition of tialite treated in a muffle furnace and in an atmospheric plasma thermal spray deposition were explored. The effect of calcination thermal treating on the tialite formation was evaluated for different temperatures (400, 600, 800, 900, 1000, 1200, 1300, and 1400°C). The powder was thermally treated by calcination at 600°C for 6 h prior to the thermal spray process. Dried gel pieces were also calcined at 600°C for 6 h and ground, the produced powders were thermally sprayed onto a stainless steel substrate and the formed coating was mechanically detached from the substrate and then characterized. It was confirmed that the thermal spray process transformed the quasi-amorphous powders to single tialite phase. The absence of the corundum and rutile phases was attributed to the high heating and cooling rates (~10 6 K/s) supplied by thermal spray processing.

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Section: Introductionmentioning

confidence: 99%

Tialite formation from its quasi-amorphous stoichiometric co-precipitated powder by thermal spray process

Camaratta

Zimmer

Bergmann

2009

Surface and Coatings Technology

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“…The main advantages of these methods are to speed up the reaction rate and to decrease the sintering temperature, which allows improving the final product homogeneity by reducing particle sizes. In particular, oxalate coprecipitation has been successfully used for the preparation of Bi-based materials such as high-T c superconducting phases [1][2][3] or bismuth titanate [4][5][6], tantalate [7,8] or niobate [9] ferroelectrics. Bismuth oxalates have also been used as precursors to prepare catalytically active bismuth molybdate or tungstate oxides [10,11]; nevertheless, a few crystal structures of bismuth oxalates have been reported so far.…”

Section: Introductionmentioning

confidence: 99%

One-dimensional inorganic arrangement in the bismuth oxalate hydroxide Bi(C2O4)OH

Rivenet

Roussel

Abraham

2008

Journal of Solid State Chemistry

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“…Aun así, las propiedades de esta configuración se ven limitadas por el implemento de métodos convencionales de síntesis, como la reacción en estado sólido y la co-precipitación, que trabajan con tiempos largos y altas temperaturas, lo que le confiere al material tamaños de partícula demasiado grandes, pobre porosidad, reducida área, y alta tendencia a la sinterización y volatilización de los componentes. Por ello, las investigaciones acerca de las rutas de síntesis de química húmeda, como la polimerización con ácido cítrico, que permitan disminuir las temperaturas y tiempos de tratamiento térmico, y aseguren la obtención de sólidos con un tamaño de partícula nanométrico, excelente control sobre la composición trabajada, alta homogeneidad en la morfología, superficies porosas y de gran área superficial específica, han venido ganado bastante interés en los campos de fabricación y aplicación de los cerámicos [11][12][13][14].…”

Section: Introductionunclassified

Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

2017

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ResumenSe sintetizó el cerámico LaFe 0,2 Co 0,8 O 3 , usando el método de polimerización con ácido cítrico. Las caracterizaciones de los precursores con espectroscopia infrarroja (FT-IR), ultravioleta visible (UV-vis), y análisis térmicos (TGA-DTA), revelaron la presencia de especies tipo citrato y la consolidación de una estructura estable a partir de los 700 • C. Análisis de difracción de rayos X (XRD), energía dispersiva de rayos X (EDX), microscopia electrónica de barrido (SEM) y espectroscopia Raman, confirmaron la consolidación de un sistema cristalino tipo LaCoO 3 de fase simple romboédrica, una superficie homogénea y porosa, y tamaño de partícula nanométrico. La evaluación mediante espectroscopia de impedancias (IS), desde temperatura ambiente hasta 900 • C, mostró un material con alta conductividad eléctrica y comportamiento semiconductor.Palabras clave: Estructura tipo perovskita, Polimerización con ácido citrico, Óxido semiconductor. AbstractThe LaFe 0.2 Co 0.8 O 3 ceramic was synthesized using polymerization with citric acid method. Characterizations of the precursors with Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV-vis), and thermal analysis (TGA-DTA), revealed the presence of species citrate type, and formation of a stable structure from up to 700 • C. Analysis by means of X-ray diffraction (XRD), energy dispersive X-ray (EDX), scanning electron microscopy (SEM) and Raman spectroscopy, confirmed the consolidation of a crystal system LaCoO 3 type, of rhombohedral single phase, with homogeneous and porous surface and nanometer particle size. The evaluation by impedance spectroscopy (IS) from room temperature to 900 • C, showed a material with good electrical conductivity and semiconductor type behavior.

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Coprecipitation method for the preparation of nanocrystalline ferroelectric CaBi2Ta2O9

Cited by 32 publications

References 12 publications

Tialite formation from its quasi-amorphous stoichiometric co-precipitated powder by thermal spray process

Tialite formation from its quasi-amorphous stoichiometric co-precipitated powder by thermal spray process

One-dimensional inorganic arrangement in the bismuth oxalate hydroxide Bi(C2O4)OH

Evaluación del cerámico con estructura tipo perovskita LaFe0,2Co0,8O3 / Evaluation of the perovskite LaFe0.2Co0.8O3

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