Kinetic study of crystallisation of sol–gel derived calcia–alumina binary compounds

Zahedi, Marjan; Roohpour, Nima; Ray, Asim K.

doi:10.1016/j.jallcom.2013.07.179

Cited by 9 publications

(3 citation statements)

References 32 publications

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“…HT XRD, DSC and DTA methods are well known and very often used for glass crystallization study [17][18][19][20][21][22][23][24][25] and for study of thermal behavior of many kinds of materials. HT XRD analysis was successfully used for study of phase development in many systems [5,22,23,[26][27][28][29][30] and for determination of conversion rate dependence on temperature in yttrium-aluminate glasses and lanthanum-aluminate glasses [5,10,28,29]. Also, the JMAK model is very frequently used to better describe a changes in materials during crystallization [5,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of binary Yb2O3–Al2O3 glass

Prnová

Plško

Valúchová

et al. 2020

J Therm Anal Calorim

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Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".

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Section: Introductionmentioning

confidence: 99%

Crystallization kinetics of binary Yb2O3–Al2O3 glass

Prnová

Plško

Valúchová

et al. 2020

J Therm Anal Calorim

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“…Therefore, sol-gel method is often chosen for the production of C12A7 powder [17,18]. The crystallisation of C12A7 consisting of calcium oxide (CaO) and aluminium oxide (Al 2 O 3 ) in a ratio of 12:7 takes place at 1100°C and values of 348 and 375 kJ/mol have been estimated from the Kissinger's equation for the activation energies of crystallisation of CaO and Al 2 O 3 components, respectively [19]. However, it has been recently reported that the addition of ethyl acetoacetate (EAA) to the oxide sol reduces the densification oxide gel significantly leading to the prolonged structural relaxation during heat treatment [20].…”

Section: Introductionmentioning

confidence: 99%

High temperature optical absorption investigation into the electronic transitions in sol–gel derived C12A7 thin films

Feizi

Ray

2015

J Mater Sci: Mater Electron

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Optical absorption into 6 mm thick sol-gel derived films, annealed at 1300°C of 12CaOÁ7Al 2 O 3 calcium aluminate binary compound on MgOh100i single crystal substrates was studied at temperatures ranging from room temperature to 300°C. Experimental data were analysed in both Tauc and Urbach regions. The optical band gap decreased from 4.088 eV at 25°C to 4.051 eV at 300°C, while Urbach energy increased from 0.191 eV at 25°C to 0.257 eV at 300°C. The relationship between the optical band gap and the Urbach energy at different temperatures showed an almost linear relationship from which the theoretical values of 4.156 and 0.065 eV were evaluated for the band gap energy and Urbach energy of a 12CaOÁ7Al 2 O 3 crystal with zero structural disorder at 0 K.

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“…Synthesis : In the x CaO–(1 − x )Al 2 O 3 system, C5A ( x = 0.83), C3A ( x = 0.75), C12A7 ( x = 0.63), CA ( x = 0.5), and CA2 ( x = 0.33) glass spheres were synthesized by liquid‐quenching CaO–Al 2 O 3 precursors in the aerodynamic levitator furnace. The precursors were prepared by a sol–gel method, using Al(OBu) 3 97% purity and (Ca(NO 3 ) 2 ·4H 2 O) 99% purity. Auxiliary materials were Etac 98% purity, hydrochloric acid with a concentration of 38%, and ethanol with purity of ≥98%.…”

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confidence: 99%

From Molten Calcium Aluminates through Phase Transitions to Cement Phases

et al. 2019

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Crystalline calcium aluminates are a critical setting agent in cement. To date, few have explored the microscopic and dynamic mechanism of the transitions from molten aluminate liquids, through the supercooled state to glassy and crystalline phases, during cement clinker production. Herein, the first in situ measurements of viscosity and density are reported across all the principal molten phases, relevant to their eventual crystalline structures. Bulk atomistic computer simulations confirm that thermophysical properties scale with the evolution of network substructures interpenetrating melts on the nanoscale. It is demonstrated that the glass transition temperature (Tg) follows the eutectic profile of the liquidus temperature (Tm), coinciding with the melting zone in cement production. The viscosity has been uniquely charted over 14 decades for each calcium‐aluminate phase, projecting and justifying the different temperature zones used in cement manufacture. The fragile–strong phase transitions are revealed across all supercooled phases coinciding with heterogeneous nucleation close to 1.2Tg, where sintering and quenching occur in industrial‐scale cement processing.

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Kinetic study of crystallisation of sol–gel derived calcia–alumina binary compounds

Cited by 9 publications

References 32 publications

Crystallization kinetics of binary Yb2O3–Al2O3 glass

Crystallization kinetics of binary Yb2O3–Al2O3 glass

High temperature optical absorption investigation into the electronic transitions in sol–gel derived C12A7 thin films

From Molten Calcium Aluminates through Phase Transitions to Cement Phases

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