Kinetic demixing in α-alumina during cooling: Influence on the powder reactivity

Petot, C.; Petot-Ervas, G.; Tebtoub, M.; Fraser, J.; Graham, M. J.; Sproule, G. I.

doi:10.1016/s0167-2738(96)00580-2

Cited by 3 publications

References 6 publications

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Modification of Mass Transport during Sintering Induced by Thermal Gradient

Saunier¹,

Valdivieso²

2009

Ceramic Transactions Series

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Due to the developments of the new sintering processes, the thermal cycles duration has been considerably reduced. But it turns out that this cycle time decrease can also conduct to thermal gradients in the sample.Up to day, the effects of such gradients are not well known. That's why the aim of this study is to contribute to understand phenomena induced by thermal gradients applied during the initial stage of sintering. We will observe the consequences on this stage but also on the further densification. Two important results are brought out :-For pure alpha-alumina : the comparison between conventional treatments and treatments under thermal gradients has shown that a gradient modifies the specific surface area drop and then accelerates the further densification.-For alpha-alumina containing impurities : The experiments have revealed that a gradient can modify the impurities' dissolution and change the mass transport. Finally grain growth can be favoured at the expense of densification.

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Modification of Mass Transport during Sintering Induced by Thermal Gradient

Saunier¹,

Valdivieso²

2009

Ceramic Transactions Series

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Complex Effect of Partial Substitution of La³⁺ by Ca²⁺ on the Stability of Fast Oxide‐Ion Conductor La₂Mo₂O₉

et al. 2008

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Keywords: Ceramics / Phase transitions / Reversible demixing / Metastability / Temperature-controlled X-ray diffraction Demixing/recombination and metastability phenomena are observed in the La 2-2x Ca 2x Mo 2 O 9-x solid solutions of LAMOX-type fast oxide-ion conductors (0.005 Յ x Յ 0.05). The demixing process is more visible at high Ca content. The effects of composition, sample shape (powders with two degrees of fineness, ceramic pellets, single crystals) and thermal history are studied by using high-temperature X-ray diffraction, differential scanning calorimetry (DSC) and polarized microscopy. All these parameters are shown to have an influence on the stability of, and transformations between, the ordered α and the disordered β forms of the LAMOX compounds. Powder samples with low Ca content (x = 0.01, 0.02) have been stabilized in the α form, and powder samples with higher Ca content (x = 0.03, 0.04, 0.05) are in the β form. Upon heating, the low-Ca-content compounds (x = 0.01 and x = 0.02) exhibit the α/β transition, whereas those with higher Ca content (x = 0.03 and x = 0.04) show a succession of β/

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Evidence of metastability and demixion/recombination process in fast oxide-ion conductor La1.92Ca0.08Mo2O8.96

2006

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Kinetic demixing in α-alumina during cooling: Influence on the powder reactivity

Cited by 3 publications

References 6 publications

Modification of Mass Transport during Sintering Induced by Thermal Gradient

Modification of Mass Transport during Sintering Induced by Thermal Gradient

Complex Effect of Partial Substitution of La³⁺ by Ca²⁺ on the Stability of Fast Oxide‐Ion Conductor La₂Mo₂O₉

Evidence of metastability and demixion/recombination process in fast oxide-ion conductor La1.92Ca0.08Mo2O8.96

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Kinetic demixing in α-alumina during cooling: Influence on the powder reactivity

Cited by 3 publications

References 6 publications

Modification of Mass Transport during Sintering Induced by Thermal Gradient

Modification of Mass Transport during Sintering Induced by Thermal Gradient

Complex Effect of Partial Substitution of La3+ by Ca2+ on the Stability of Fast Oxide‐Ion Conductor La2Mo2O9

Evidence of metastability and demixion/recombination process in fast oxide-ion conductor La1.92Ca0.08Mo2O8.96

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Complex Effect of Partial Substitution of La³⁺ by Ca²⁺ on the Stability of Fast Oxide‐Ion Conductor La₂Mo₂O₉