Influence of preparation route and slip casting conditions on titania and barium titanate ceramics

Nikumbh, A.K.; Adhyapak, Parag V.

doi:10.1016/j.partic.2011.09.007

Cited by 3 publications

(5 citation statements)

References 85 publications

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“…A broad exothermic peak around 680°C on the DTA curve with a corresponding weight loss of around 9.8% on the TG curve was close to the theoretical weight loss expected during intermediate [(Ba,Sr) 2 Ti 2 Zr x O 5 CO 3 ] x‐σ phase formation. The weight loss associated with the solid‐state reaction between metal carbonate and amorphous TiO 2 was reported as 17.4% . Therefore, the current weight loss suggested that the reaction followed the carboxylate complex mechanism.…”

Section: Resultsmentioning

confidence: 89%

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Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Mahmood

Akhtar

Iqbal

et al. 2017

Int J Applied Ceramic Tech

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Ba0.7Sr0.3ZrxTi1−xO3 (BSZT; where x=0.02, 0.04, 0.06, 0.08, 0.1) ceramics were processed through a sol‐gel method at 1450°C for 6 h. All the samples showed a diffuse phase transition which might be due to the presence of polar nanoregions, those associated with the composition inhomogeneity in the BSZT ceramics. The sample with x=0.02 exhibited a dielectric constant (ɛ=23714) which successively decreased with increasing x up to 8569 for the sample with x=0.1 around Tc measured at 10 kHz. Ceramic samples showed a ferroelectric hysteresis behavior similar to relaxor materials.

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Section: Resultsmentioning

confidence: 89%

“…The weight loss associated with the solid-state reaction between metal carbonate and amorphous TiO 2 was reported as 17.4%. 16 Therefore, the current weight loss suggested that the reaction followed the carboxylate complex mechanism. Figure 2A shows XRD profiles for the BSZT (x=0.02) gel.…”

Section: Resultsmentioning

confidence: 98%

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Mahmood

Akhtar

Iqbal

et al. 2017

Int J Applied Ceramic Tech

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“…Trata-se, provavelmente, de um caso de estabilização do tipo eletrostática, onde o aditivo dispersante é adsorvido em torno das partículas formando uma dupla camada. Assim, as partículas são afastadas uma das outras, diminuindo a força de atração e a desaglomeração das estruturas formadas, diminuindo a viscosidade aparente, resultando em misturas concentradas trabalháveis no intervalo de tempo necessário à sua aplicação [3][4][5]. O aumento da viscosidade observado para 3% de dispersante deve-se, provavelmente, ao excesso de PAA que produz reaglomeração das partículas devido à interação do dispersante com a água e interações interfaciais e hidrodinâmicas.…”

Section: Resultsunclassified

“…Dentre as técnicas atrativas e bem estabelecidas de processamento cerâmico que utilizam suspensões para a produção de determinados tipos de componentes destaca-se a colagem de barbotina. Neste tipo de processamento, suspensões estáveis contendo alta fração volumétrica de sólidos e com elevado grau de estabilidade são requisitos importantes para a obtenção de produtos com maior qualidade [2,3]. Assim, o desenvolvimento de suspensões cerâmicas reologicamente ajustadas é um fator decisivo para a obtenção de materiais com elevada densidade e estabilidade dimensional.…”

Section: Introductionunclassified

Reologia de suspensões de precursor vitrocerâmico do sistema LiO2-ZrO2-SiO2-Al2O3

Cesconeto¹,

Neto²,

Arcaro³

et al. 2014

Cerâmica

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ResumoSuspensões cerâmicas em meio aquoso foram preparadas a partir de precursor vitrocerâmico (pó vítreo) do sistema LZSA (LiO 2 -ZrO 2 -SiO 2 -AlO 2 ). As condições de processamento foram estabelecidas através das características do precursor vitrocerâmico e do estudo reológico das suspensões formuladas. A partir da caracterização granulométrica do pó vítreo, variou-se a concentração de sólidos entre 30-40% (em volume), de dispersante poliacrilato de amônia entre 1,0-3,0% (PAA) e de ligante polialcoolvinílico (PVA) entre 0,1-0,5% (com base na massa de sólidos da suspensão). Considerando-se a influência da concentração dos adjuvantes reológicos, assim como as características desejadas para os corpos cerâmicos a verde (elevada densidade), as suspensões foram processadas por colagem de barbotina. Os resultados revelaram que suspensões processadas com 40% de sólidos, 2% de PAA e 0,3% de PVA, proporcionaram as melhores condições para colagem de barbotina do sistema LZSA. Palavras-chave: LZSA, reologia, colagem de barbotina. Abstract Aqueous ceramic suspensions were prepared from a parent glass powder belonging to the LZSA (LiO

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“…Thus, in recent years, a variety of methods have been devised in order to replace the conventional one, obtaining finer powder and less agglomerated barium titanate. These chemical methods include hydrothermal synthesis, precipitation [5,7,8] and polymeric routes [9]. However, not only are most of these methods expensive, but they may also favor the formation of small-sized grains, adverse to piezoelectric properties [1].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Barium Titanate by Solid-State Reaction

Andrade

Carneiro

Moreira

et al. 2014

MSF

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Solid-state reactions were used to synthesize pure and doped barium titanate powder. Barium titanate formation with tetragonal perovskite structure was detected by X-ray diffraction and occurred at a temperature above 700°C for pure powder and 500°C for doped powder. However, quite crystalline samples were observed only at 800oC and 600°C for pure and doped barium titanate, respectively, what made the refinement of the synthesized powders possible. They were characterized by X-ray diffraction and Fourier transform infrared spectroscopy and scanning electron microscopy. X-ray diffraction data was analyzed by using the Fullprof Rietveld refinement approach, Thompson-Cox-Hastings pseudo-Voigt with function. The refinement method was effective in the study of the temperature influence on the microstructure of the analysis of pure and doped barium titanate.

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Influence of preparation route and slip casting conditions on titania and barium titanate ceramics

Cited by 3 publications

References 85 publications

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Reologia de suspensões de precursor vitrocerâmico do sistema LiO2-ZrO2-SiO2-Al2O3

Synthesis and Characterization of Barium Titanate by Solid-State Reaction

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Influence of preparation route and slip casting conditions on titania and barium titanate ceramics

Cited by 3 publications

References 85 publications

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba0.7Sr0.3TiO3 polycrystalline ceramic systems

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba0.7Sr0.3TiO3 polycrystalline ceramic systems

Reologia de suspensões de precursor vitrocerâmico do sistema LiO2-ZrO2-SiO2-Al2O3

Synthesis and Characterization of Barium Titanate by Solid-State Reaction

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Product

Resources

About

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems

Dielectric and ferroelectric properties of the sol‐gel–derived Zr‐doped Ba_0.7Sr_0.3TiO₃ polycrystalline ceramic systems