On the formation of an oxycarbonate intermediate phase in the synthesis of BaTiO3 from (Ba,Ti)-polymeric organic precursors

Durán, P.; Gutiérrez, D.; Tartaj, J.; Bañares, Miguel Á.; Moure, C.

doi:10.1016/s0955-2219(01)00392-2

Cited by 70 publications

(73 citation statements)

References 24 publications

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“…The Raman spectra of powders heat treated between 500 and 575°C exhibited a fluorescent-like background. The band around of 1061 cm -1 (marked with a  i n F i g u r e 6 ) w e r e a t t r i b u t e d t o t h e ( B a 0.8Ca0.2)2Ti2O5.CO3 intermediate phase [34]. Bands of the intermediate phase disappear completely in the powders heat treated at 600°C, agreeing with XRD data.…”

Section: Characterization Of the Calcined Powders (Bct20)supporting

confidence: 80%

“…If the carboxyl groups were involved in bridging in the chelation of CA complex, the value for ν would be expected to be lower than (νas-νs) ~ 170 cm -1 [32]. In the region below 1000 cm -1 a broad band that was attributed to stretching of the bond M-O appears, where M is Ti, Ba or Ca [34]. Similar bonds were verified by 13C NMR measurements performed on this solution, as discussed below.…”

Section: Characterization Of the Precursor Solutionmentioning

confidence: 98%

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Synthesis of Ba1-xCaxTiO3 by Complex Polymerization Method (CPM)

Motta¹,

Marques²,

Paskocimas³

et al. 2012

Polymerization

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Synthesis of Ba1-xCaxTiO3 by Complex Polymerization Method (CPM) 275provokes degeneracy and destabilization in the localized states of the atoms acting as electron-hole pairs and supporting the broad PL band phenomena and electronic levels are fundamental to understanding the order-disorder process in the solid state. These optical properties exhibited by disordered BCT20 suggest that this material is a highly promising candidate for photoluminescent applications.

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Section: Characterization Of the Calcined Powders (Bct20)supporting

confidence: 80%

Section: Characterization Of the Precursor Solutionmentioning

confidence: 98%

Synthesis of Ba1-xCaxTiO3 by Complex Polymerization Method (CPM)

Motta¹,

Marques²,

Paskocimas³

et al. 2012

Polymerization

View full text Add to dashboard Cite

show abstract

“…Observam-se bandas características entre 600 e 450 cm -1 , referentes à coordenação dos cátions de cobre e ferro com os grupos carboxílicos da gelatina. As bandas em 1614 e 1408 cm -1 são referentes à presença de grupos funcionais orgânicos C=O, sendo estes resultados semelhantes aos reportados [7].…”

Section: Resultsunclassified

Síntese e caracterização de espinélios à base de ferritas com gelatina como agente direcionador

et al. 2011

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ResumoAs ferritas com estrutura tipo espinélio compreendem um grupo de materiais magnéticos muito bem estabelecidos. Contudo, melhoramentos e inovações continuam acontecendo visando novas aplicações e otimização das técnicas de preparação. Dentre os materiais com estrutura espinélio, as ferritas se destacam por possuírem ampla importância tecnológica na área de materiais, com aplicabilidades em sensores de umidade e de oxigênio, materiais de microondas, pigmentos, materiais magnéticos e elétricos, catálise de hidrogenação, fi lmes fi nos, revestimentos cerâmicos, dentre outros. Neste trabalho espinélios tipo CuFe 2 O 4 e CuFeCr 2 O 4 foram sintetizadas usando gelatina como agente direcionador, com a fi nalidade de produzir partículas nanométricas e homogêneas através de um método simples, rápido e economicamente viável. Os pós foram caracterizados por difração de raios X, espectroscopia de absorção no infravermelho e microscopia eletrônica de varredura. Os resultados confi rmaram a viabilidade da rota de síntese utilizada. Palavras-chave: espinélios, ferritas, método Pechini. Abstract

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“…44) The data does reveal weak shoulders near 2945, 2852, 1682, and 1109 cm butandiol is believed to be involved in the formation of these peaks through substitution on a surface hydroxyl group. 45), 46) There are two absorption bands which were only observed in ZrO 2 samples synthesized above 200°C. A sharp absorption band at 550 cm ¹1 corresponds to Eu mode of ZrO vibration of tetragonal structure.…”

Section: Surface Characterization Of Zro 2 Nanoparticlesmentioning

confidence: 98%

Glycothermal synthesis of nanocrystalline ZrO2 powders at low temperature without mineralizers

Kil

Hwag

Ryu

et al. 2012

J. Ceram. Soc. Japan

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Zirconia (ZrO 2 ) nanoparticles were synthesized at temperature as low as 200°C through a glycothermal reaction using amorphous zirconium hydrous gel precursors and 1,4-butanediol as solvent, XRD and TEM data support that glycothermal processing method provides a simple low temperature route for producing highly crystallized ZrO 2 nanoparticles without mineralizers, which could also be extended to other systems. XRD results also showed that ZrO 2 nanoparticles synthesized in glycothermal condition had tetragonal phase with small portion of monoclinic phase, where the tetragonality was confirmed by Raman spectroscopy. The as-prepared ZrO 2 nanoparticles have spherical morphology with an average crystal size of 1015 nm and agglomerated into bigger spheres with a diameter of about 100 nm. The tetragonal phase begins to transform to monoclinic phase at 600°C when the calcinations of the as-synthesized powder was carried out.

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On the formation of an oxycarbonate intermediate phase in the synthesis of BaTiO3 from (Ba,Ti)-polymeric organic precursors

Cited by 70 publications

References 24 publications

Synthesis of Ba1-xCaxTiO3 by Complex Polymerization Method (CPM)

Synthesis of Ba1-xCaxTiO3 by Complex Polymerization Method (CPM)

Síntese e caracterização de espinélios à base de ferritas com gelatina como agente direcionador

Glycothermal synthesis of nanocrystalline ZrO2 powders at low temperature without mineralizers

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