Academic Journal
High-Temperature Thermodynamics of Cerium Silicates, A-Ce2Si2O7 , and Ce4.67(SiO4)3O
| العنوان: | High-Temperature Thermodynamics of Cerium Silicates, A-Ce2Si2O7 , and Ce4.67(SiO4)3O |
|---|---|
| المؤلفون: | Strzelecki, Andrew, C, Kriegsman, Kyle, Estevenon, Paul, Goncharov, Vitaliy, Bai, Jianming, Szenknect, Stephanie, Mesbah, Adel, Wu, Di, Mccloy, John, S, Dacheux, Nicolas, Guo, Xiaofeng |
| المساهمون: | Washington State University (WSU), Interfaces de Matériaux en Evolution (LIME), Institut de Chimie Séparative de Marcoule (ICSM - UMR 5257), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Institut de Chimie - CNRS Chimie (INC-CNRS)-Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Département de recherche sur les procédés pour la mine et le recyclage du combustible (DMRC), Institut des Sciences et technologies pour une Economie Circulaire des énergies bas carbone (ISEC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Brookhaven National Laboratory Upton, NY (BNL), UT-Battelle, LLC-Stony Brook University SUNY (SBU), State University of New York (SUNY)-State University of New York (SUNY)-U.S. Department of Energy Washington (DOE) |
| المصدر: | ISSN: 2472-3452 ; ACS Earth and Space Chemistry ; https://hal.science/hal-03004698 ; ACS Earth and Space Chemistry, 2020, 4 (11), pp.2129-2143. ⟨10.1021/acsearthspacechem.0c00231⟩. |
| بيانات النشر: | CCSD ACS |
| سنة النشر: | 2020 |
| المجموعة: | Université de Montpellier: HAL |
| مصطلحات موضوعية: | cerium sorosilicate, cerium oxyapatite, thermodynamics, enthalpy of formation, thermal barrier coating, environmental barrier coatings, ceramic waste forms, rare earth minerals, lanthanide geochemistry, [CHIM.MATE]Chemical Sciences/Material chemistry |
| الوصف: | International audience ; Lanthanide disilicates and oxyapatites have potential roles in high-temperature applications as thermal (TBC) and environmental barrier coatings (EBC) or possible alteration phases in geological nuclear waste repositories. However, those Ce3+-bearing silicates have only been limitedly studied. In this work, we performed detailed structural and thermodynamic investigations on A-Ce2Si2O7 (tetragonal, P41) and Ce4.67(SiO4)3O (hexagonal, P63/m). The high-temperature structural behaviors and coefficients of thermal expansion were determined by in situ high-temperature synchrotron X-ray diffraction (HT-XRD) implemented with Rietveld analysis and thermogravimetric analysis coupled with differential scanning calorimetry (TGA-DSC). A-Ce2Si2O7 was found to be stable in N2 and air up to ∼1483 K with an isotropic thermal expansion along the a- and c-axes (αa = 12.3 × 10–6 K–1 and αc= 12.4 × 10–6 K–1). Ce4.67(SiO4)3O had a slow partial oxidation between 533 and 873 K to a new nonstoichiometric phase Ce3+1.67-xCe4+xCe3+3(SiO4)3O1+0.5x, followed by a thermal decomposition to CeO2 and SiO2 at ∼1000 K in air. By using high temperature oxide melt solution calorimetry at 973 K with lead borate as the solvent, the standard enthalpy of formation was determined for A-Ce2Si2O7 (−3825.1 ± 6.0 kJ/mol) and Ce4.67(SiO4)3O (−7391.3 ± 9.5 kJ/mol). These thermodynamic parameters were compared with those of CeO2, CeSiO4, and other silicate oxyapatites for examining their chemical stability in high-temperature environments relevant for aeronautical applications, mineral formation, and nuclear fuel cycle |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| DOI: | 10.1021/acsearthspacechem.0c00231 |
| الاتاحة: | https://hal.science/hal-03004698 https://hal.science/hal-03004698v1/document https://hal.science/hal-03004698v1/file/Strzelecki%20-%20High-Temperature%20Thermodynamics%20of%20Cerium%20Silicates,%20A%E2%80%91Ce2Si2O7,and%20Ce4.67%28SiO4%293O.pdf https://doi.org/10.1021/acsearthspacechem.0c00231 |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.BB6DC9F6 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1021/acsearthspacechem.0c00231 |
|---|