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Chapter 6. Molybdate Based Ceramic Electrode Materials 182 humidified 9% H2/Ar depending on the composition. After each heat treatment and sintering, the phase of the powders or sintered bodies was examined by XRD using a STOE Diffractometer with Cu-Kα radiation. After sintering, some samples of each material were polished down to 1 μm diamond paste and examined in the SEM/EDX (a Zeiss Supra 35 FE- SEM equipped with a Noran System SIX X-ray microanalysis system). The heat treatment conditions for successful phase formation and sintering for each material are reported and discussed in section 6.3.1. Table 6-2. The molybdate materials that were synthesized and studied in the present work. The tolerance factors were calculated using the low-spin ionic radii Composition SrMoO3 LaMoO Sr2CoMoO6 Sr2FeMoO6 Sr2MgMoO6 Sr MgMoO b 2 6-δ Sr2MgWO6 Sr2NiMoO6 Sr2NiWO6 SrTi0.5Mo0.5O3 SrTi0.5Ni0.25Mo0.25O3 SrV0.5Mo0.5O3 B site composition Acronym Crystal structure Tol. factor SM Perovskite 0.98 LM Amorphous - SCM Double perovskite 0.99 SFM Double perovskite 1.00a SMM_1 Double perovskite 0.98 SMM_2 Double perovskite 0.98 SMW Double perovskite 0.97 SNM Double perovskite 0.98 SNW Double perovskite 0.98 STM Perovskite 0.99 Mo6+ Ni2+ STNM502525 (Double?) perovskite 0.99 SVM Perovskite 1.00 Mo6+ Mo5+/6+ Mo6+ Mo4+ Movarious+ Co2+ Fe2+/3+ Mg2+ Mg2+ Mo5+/6+ W6+ Mg2+ Mo6+ Ni2+ W6+ Ni2+ Mo4+ Ti4+ Ti4+ Mo4+ V4+ a Tolerance factor for Fe2+ and Mo6+ or Mo5+. The exact amounts of Fe2+, Fe3+, Mo5+, and Mo6+ are not known. With both ions fully reduced (Fe3+ and Mo5+), the tolerance factor is slightly higher, 1.01. b Synthesized in reducing atmosphere (see Table 6-4). Table 6-3. Purities (wt%) and suppliers of the oxide and carbonate precursor compounds used to prepare the molybdates and titanates. Precursor compound Co3O4 Fe2O3 La2O3 MgO MnCO3 MoO3 Nb2O5 NiO SrCO3 TiO2 WO3 V2O5 Y2O3 Purity Supplier 99.7% Alfa Aesar 99.9% Alfa Aesar 99.99% Alfa Aesar 99.5% Alfa Aesar 99.99% Johnson Matthey 99.95% Alfa Aesar 99.9% Alfa Aesar 99% Alfa Aesar 99.9% Sigma Aldrich 99.8% Sigma Aldrich 99.8% Alfa Aesar 99.6% Alfa Aesar 99.9% Johnson MattheyPDF Image | Electrolysis of CO2 and H2O
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