Solution combustion synthesis and sintering behavior of CaAl2O4

Rodríguez, Miguel Á.; Aguilar, Cesar; Aghayan, Marina

doi:10.1016/j.ceramint.2011.07.020

Cited by 40 publications

(18 citation statements)

References 26 publications

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“…SCS has been used to synthesize large number of inorganic materials, either simple oxides (α-Al 2 O 3 [3], ceria [4], γ-Fe 2 O 3 [5], magnetite [6], anatase [7], zirconia [8] and cobalt oxides [9]), or mixed oxides with different complexity (wollastonite [10], CaAl 2 O 4 [11], YAG [12], doped MgO [13], Ti 1-x M x O 2 [14], perovskites [15][16][17]). In addition, due to SCD high versatility to obtain complex structures, some research groups have investigated the synthesis of ceramic pigments by means of this method.…”

Section: Introductionmentioning

confidence: 99%

Characteristics reproducibility of (Fe, Co)(Cr, Al) 2 O 4 pigments obtained by solution combustion synthesis

Gilabert

Palacios

Sanz

et al. 2016

Ceramics International

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Synthesis reproducibility of mixed spinels Fe 1-Ψ Co Ψ Cr 2-2Ψ Al 2Ψ O 4 (0≤Ψ≤1), obtained by Solution Combustion Synthesis using urea as fuel, has been studied. Pigments with spinel structure Fd-3m have been obtained for all the compositional range analyzed. Characteristics such as crystallinity, cell parameter, crystal size and specific surface area show a noticeable dependence with Ψ, but some of them present a low reproducibility, indicating a pronounced dependency with process conditions in each batch.Colouring power of synthesized pigments is highly significant, so they can be directly integrated in ceramic glasses without introducing a second thermal treatment. However, the generated colour also suffers from a limited reproducibility. IntroductionSolution combustion synthesis (SCS) is an innovative method to synthesize ceramic pigments, which allows obtaining materials in a direct pathway, with a low particle size, using short reaction times and moderate temperatures [1].Experimental results reported on this topic show that the traditional methodology for preparation of spinels via ceramic method involves annealing at temperatures up to 1400ºC and long soaking times [2]. During this thermal treatment, solid state reactions take place and the chromophore cations are incorporated into the newly generated host lattice. However, due to the elevated temperature reached during the process, the resulting pigment presents low specific surface area and high particle size, which is reflected in a low colouring power. For this reason, in the industrial practice a milling operation of the pigment is mandatory in order to obtain a marketable product. In addition, the ink-jet technology applied to ceramic decoration requires pigments with a particle size around 500 nm, which supposes an increase in the cost of the milling stage and a change in the milling technology. As a consequence, there is a growing demand for alternative routes for synthesizing pigments that give directly particle sizes near to the interval recommended for ink-jet machines. SCS is a method suitable to overcome some important disadvantages of ceramic pigment traditional processing because it could generate pigments as low cohesive masses formed of nanograins, easier to mill up to the submicrometer interval.3 SCS method begins with a concentrated aqueous solution of precursors of the desired product (being the nitrates the most frequently used), and a suitable fuel (glycine, urea, hexamethylentetraamine, hydrazine and their derivates, etc.). The solution is heated at high rate in order to evaporate all water and, afterwards, to ignite the fuel present in the solid residue, which supplies enough energy to carry out the synthesis reaction. The reaction product is frequently obtained as a spongy mass.SCS has been used to synthesize large number of inorganic materials, either simple Most of the spinel-type ceramic industrial pigments include more than three metals in their composition to adjust the final colour. As a consequence, it was investi...

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Section: Introductionmentioning

confidence: 99%

Characteristics reproducibility of (Fe, Co)(Cr, Al) 2 O 4 pigments obtained by solution combustion synthesis

Gilabert

Palacios

Sanz

et al. 2016

Ceramics International

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“…Resultados obtidos em pesquisas anteriores sobre síntese de materiais cerâmicos com estrutura de espinélio [8][9][10] mostraram que após a calcinação de um composto de aluminato de cálcio a 800 °C durante 2 h, o pó cerâmico apresentava-se amorfo; mas, ao elevar-se a temperatura de calcinação para 1000 °C, a cristalinidade aumentou consideravelmente e a fase α-Al 2 O 3 era identificada nas estruturas dos materiais obtidos. Aumentando-se a temperatura de calcinação para 1100 °C, a fase α-Al 2 [11,12].…”

Section: Resultsunclassified

Materiais cerâmicos catalíticos à base de hexa-aluminato de metais alcalino terrosos (Ba e Ca): síntese e análise estrutural

et al. 2015

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ResumoO objetivo desse trabalho é desenvolver catalisadores cerâmicos compostos por hexa-aluminatos de metais alcalinos terrosos (Ca e Ba) -CaAl 12 O 19 e BaAl 12 O 19 , respectivamente, na forma de pó cerâmico, por meio dos métodos de síntese Pechini e da reação de combustão. Analisar a influência destes métodos de síntese sobre as características estruturais e físicas dos materiais obtidos faz parte dos objetivos deste estudo. Ambos os métodos de síntese empregados neste trabalho se mostraram eficientes para a reprodução dos materiais cerâmicos supramencionados. No entanto, com base nos resultados obtidos, o método Pechini mostrou-se mais adequado para a reprodução destes materiais por ter levado à obtenção de amostras compostas por hexa-aluminato de cálcio e de bário contendo menores teores residuais de matéria orgânica oriundas da metodologia de síntese além das mesmas terem apresentado características texturais mais apropriadas para um material cerâmico destinado a processos catalíticos heterogêneos de cargas gasosas. Palavras-chave: catalisadores, hexa-aluminatos, sintese cerâmica e análise estrutural. Abstract The aim of this work is to develop ceramic catalysts composed by hexaluminates alkaline earth metals (Ca and Ba) -CaAl

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“…At the same time, aluminate materials could be successfully used as a solid oxide fuel cell functional anode material [4]. Calcium aluminates have low density and hardness; therefore, they are used in the steel and cement industry [5]. Magnesium aluminates have interesting mechanical and refractory properties [6].…”

Section: Introductionmentioning

confidence: 99%

Investigation of phase formation dependency of photoluminescence properties of Eu3+ in Mg4Al2O7:Eu3+,Dy3+ and Ca4Al2O7:Eu3+,Dy3+ red-emitting phosphors

Öztürk

Karacaoğlu

2015

J Therm Anal Calorim

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Rare earth-doped Mg were synthesized by the solid-state reaction method at 1,400°C. The phosphors were characterized by X-ray powder diffraction, photoluminescence, thermogravimetry and differential thermal analysis and scanning electron microscopy. X-ray powder diffraction studies show that the Mg 4 Al 2 O 7 :Eu 3? ,Dy 3? phosphor was crystallized in the triclinic crystal system but that Ca 4 Al 2 O 7 : Eu 3? ,Dy 3? was not. The phosphors show the characteristic broad band phosphorescence of Eu 3? . This broad band phosphorescence has red emission bands in the range of 550-700 nm corresponding to 5 D 0 ? 7 F j (j: 1, 2, 3,) transitions of Eu 3? .

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Solution combustion synthesis and sintering behavior of CaAl2O4

Cited by 40 publications

References 26 publications

Characteristics reproducibility of (Fe, Co)(Cr, Al) 2 O 4 pigments obtained by solution combustion synthesis

Characteristics reproducibility of (Fe, Co)(Cr, Al) 2 O 4 pigments obtained by solution combustion synthesis

Materiais cerâmicos catalíticos à base de hexa-aluminato de metais alcalino terrosos (Ba e Ca): síntese e análise estrutural

Investigation of phase formation dependency of photoluminescence properties of Eu3+ in Mg4Al2O7:Eu3+,Dy3+ and Ca4Al2O7:Eu3+,Dy3+ red-emitting phosphors

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