The kinetics and mechanism of thermal decomposition of SrCO3 polymorphs

Ptáček, Petr; Bartoníčková, Eva; Švec, Jiří; Opravil, Tomáš; Šoukal, František; Frajkorová, Františka

doi:10.1016/j.ceramint.2014.08.043

Cited by 65 publications

(32 citation statements)

References 86 publications

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“…A strong narrow peak at $ 859 cm À 1 can be assigned to the out-of-the-plane bending (υ 2 ) mode, and that observed at $ 1071 cm À 1 to the fully symmetric stretching (υ 1 ) mode of CO 2 À 3 ions. The absorption bands characteristic of Sr (OH) 2 , and SrCO 3 observed here are similar to those presented in the literature [59,60].…”

Section: Samplesupporting

confidence: 83%

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Upasen

Batocchi

Mauvy

et al. 2015

Ceramics International

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During the last decades, perovskite-type oxides have received large attention as potential electrolytes and electrodes for Solid Oxide Fuel Cells (SOFC), including Proton Ceramic Fuel Cells (PCFC), gas separation membranes and High Temperature Steam Electrolysers (HTSE). A thermal treatment in an autoclave, at a temperature close to an operating temperature, was used to measure the chemical stability of La 0.6 Sr 0.4 Co 0.2 Fe 0.8 O 3 À δ (LSCF6428) ceramic under medium and high water pressure ( $20 and 40 bar). This mixed ionicÀ electronic conductor (MIEC) exhibits interesting properties as cathode of fuel cell materials. The reactivity rate of the investigated LSCF6428 sample under the protonation process conditions (several weeks at 550 1C using CO 2 -free and CO 2 -saturated water) was studied in order to evaluate a potential use of this compound. Bulk and surface structural/chemical changes were characterized by optical microscopy, TGA, dilatometry, Raman and ATR-FTIR spectroscopy. The results revealed only minor surface modifications in the case of ceramic treated under medium vapor pressure (20 bar) using CO 2 -free water. On the contrary, under higher pressure (40 bar) and CO 2 -saturated water several second phases were detected, namely strontianite, cobalt oxides and hematite. The chemical/structural stability of LSCF6428 is compared with previously investigated RareEarth nickelate ceramics: La 2 NiO 4 þ δ / Pr 2 NiO 4 þ δ / Nd 2 NiO 4 þ δ .

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Section: Samplesupporting

confidence: 83%

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Upasen

Batocchi

Mauvy

et al. 2015

Ceramics International

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“…Above 500℃ the surface is dominated by the carbonate coverage reaching a peak of 90% at 1000℃. That result is consistent with recent measurements on thermal decomposition of SrCO 3 40. At 1000℃ 3% of the surface consists of exposed free oxide sites.…”

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confidence: 93%

Interaction of SrO-terminated SrTiO₃ surface with oxygen, carbon dioxide, and water

et al. 2018

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“…The transformation between orthorhombic (a) and hexagonal (b) polymorphs of SrCO 3 takes place at the temperature of 933°C. This process as well as the mechanism and kinetics of thermal decomposition of SrCO 3 are described in previous works [17,18,33].…”

Section: Resultsmentioning

confidence: 97%

Solid-state synthesis of SrY2O4 and SrSm2O4

Opravil

Ptáček

Šoukal

et al. 2015

J Therm Anal Calorim

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The course of solid-state synthesis of SrY 2 O 4 and SrSm 2 O 4 is described in this work. The processes during the thermal treatment, the mechanism and kinetics, the reactivity with water and the thermal stability of products were investigated by thermal analysis, isothermal calorimetry, infrared spectroscopy and scanning electron microscopy. Since solid-state synthesis does not show any significant effect on DTA, the course of synthesis was observed by the expansion of specimen. The kinetics of formation of SrY 2 O 4 and SrSm 2 O 4 is driven by the rate of reaction of 2nd order (g(a) = (1 -a) -1 -1) and requires the E a of 450 and 918 kJ mol -1 , respectively. The heat released by the reaction of SrSm 2 O 4 with water is significantly higher than that of SrY 2 O 4 .

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The kinetics and mechanism of thermal decomposition of SrCO3 polymorphs

Cited by 65 publications

References 86 publications

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Interaction of SrO-terminated SrTiO₃ surface with oxygen, carbon dioxide, and water

Solid-state synthesis of SrY2O4 and SrSm2O4

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The kinetics and mechanism of thermal decomposition of SrCO3 polymorphs

Cited by 65 publications

References 86 publications

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Chemical and structural stability of La0.6Sr0.4Co0.2Fe0.8O3− ceramic vs. medium/high water vapor pressure

Interaction of SrO-terminated SrTiO3 surface with oxygen, carbon dioxide, and water

Solid-state synthesis of SrY2O4 and SrSm2O4

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Product

Resources

About

Interaction of SrO-terminated SrTiO₃ surface with oxygen, carbon dioxide, and water