Phase transition in barium titanate nanocrystals by chemical treatment

Badheka, Prerak; Lai, Qi; Lee, Burtrand I.

doi:10.1016/j.jeurceramsoc.2005.01.057

Cited by 32 publications

(20 citation statements)

References 22 publications

(26 reference statements)

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“…Besides, the value of K d has a local maximum at 400-600 0 C in spite of further decreasing of specific surface area.This phenomenon, in our point of view, can be associated with appearance of new active centers namely structure defects (probably the same nature as after milling) in this temperature interval due to removal of surface OH-groups. DTA-TG data indicate mass loss equal 1.3-1.8 % w/w ( Figure 5) that agrees with literature data [27]. At temperature higher than 600 0 C the values S and K d diminish consistently.…”

Section: Photodegradation Of Safranin T On Bt Prepared By Mchtsupporting

confidence: 90%

Mechanochemical synthesis of barium titanate and its photocatalytic properties

Sydorchuk¹,

Khalameida²,

Zazhigalov³

2009

Annales UMCS, Chemistry

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The nano-dispersed barium titanate was synthesised by mechanochemical treatment of barium titanyl oxalate and mixture of BaO and TiO 2 . Prepared barium titanate demonstrates higher photoactivity in comparison to the same sample obtained by traditional solid state reaction. Shift of absorption edge in the visible region and respective narrowing of the band gap for the milled samples were observed.

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Section: Photodegradation Of Safranin T On Bt Prepared By Mchtsupporting

confidence: 90%

Mechanochemical synthesis of barium titanate and its photocatalytic properties

Sydorchuk¹,

Khalameida²,

Zazhigalov³

2009

Annales UMCS, Chemistry

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“…O Dip Coating é uma das técnicas utilizadas no processo de preparação dos filmes finos [15,16]. Essa técnica consiste na aplicação de uma solução em um substrato, geralmente, como substrato, utiliza-se uma fina lâmina de vidro para fins de pesquisa.…”

Section: Dip Coatingunclassified

Preparação e caracterização de pós e filmes finos de BaTiO3 sintetizados via método Pechini

Cerconi

González‐Borrero

2013

Matéria (Rio J.)

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RESUMONos últimos anos o emprego do titanato de bário (BaTiO 3 ) na indústria de cerâmicas tecnológicas e em dispositivos optoeletrônicos tem se incrementado em decorrência de suas propriedades ferroelétricas, termoelétricas, piezoelétricas e ópticas. O objetivo deste trabalho foi sintetizar e caracterizar pós e filmes finos amorfos de titanato de bário (BaTiO 3 ), por meio do método Pechini. Esses pós foram caracterizados via Análise Térmica (TG/DSC) e Difração de Raios X (DRX). A temperatura utilizada no tratamento térmico dos pós foi de 400°C a 800°C dependendo da amostra, durante 10 horas. A análise estrutural de DRX revelou um aumento da linha espectral, que pode ser observada em alguns difratogramas, próxima do ângulo de 30° em 2, sugerindo uma maior cristalinidade e um aumento do tamanho do cristalito provocado pelo aumento da temperatura de calcinação. Essas análises indicaram também a presença de BaCO 3 , além disso, observou-se a formação de apenas um pico próximo a 45° em 2, sugerindo a formação de titanato com fase cúbica. A partir dos difratogramas foi calculado o tamanho de grão, o resultado obtido foi da ordem de 20 nm. Os filmes finos de BaTiO 3 foram depositados via Dip Coating. Esses filmes foram analisados por meio da Microscopia de Força Atômica (AFM). Esta técnica permitiu observar aglomerações de partículas em todos os filmes. A superfície desses filmes apresentou alterações significativas em sua rugosidade com aumento da temperatura de tratamento térmico dos filmes. Palavras-chave:Titanato de Bário; Método Pechini; Filmes Finos. ABSTRACTIn recent years the use of barium titanate (BaTiO 3 ) in ceramics industry technology and optoelectronic devices has increased due to their ferroelectric, thermoelectric, piezoelectric and optical properties. The objective of this study was to synthesize and characterize amorphous powders and thin films of barium titanate (BaTiO 3 ), through the Pechini method. These powders were characterized via thermal analysis (TG / DSC) and X-Ray Diffraction (XRD). The temperature employed in the heat treatment of the powders was 400° C to 800° C depending on the sample, for 10 hours. Structural analysis of the XRD revealed an increase in the spectral line which can be observed in some diffractograms patterns near to the angle of 30º 2, suggesting a higher crystallinity and an increase in crystallite size caused by the increase of the calcination temperature. These tests also indicate the presence of BaCO 3 and was also observed the formation of only one peak at 45° 2, suggesting the formation of cubic phase with titanate. Through the results obtained from the XRD the grain size was calculated, whose dimensions gotten were approximately 50 nm. BaTiO 3 thin films were deposited by dip coating. These films were studied by atomic force microscopy (AFM). This technique allowed us to observe clusters of particles in every film. The surface of these films presented significant changes in roughness with increasing temperature heat treatment of films.

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“…[25][26][27][28][29][30] An advantage of using the technique proposed here is that it does not require electrodes or a highly controlled environment during the measurements; it only requires a free surface over the ceramic bulk where to direct the light beam. This is very convenient when thin films of ceramics are used and it is necessary to characterize them.…”

Section: Discussionmentioning

confidence: 99%