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Preparation, Stability and Thermodynamic Properties of Nd‐ and Lu‐Doped BaCeO 3 Proton‐Conducting Ceramics
Author(s) -
Matskevich Nata I.,
Wolf Thomas,
Matskevich Mariya Yu.,
Chupakhina Tatiana I.
Publication year - 2009
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200800589
Subject(s) - chemistry , lutetium , orthorhombic crystal system , lanthanide , neodymium , decomposition , standard enthalpy of formation , proton , inorganic chemistry , nuclear chemistry , analytical chemistry (journal) , crystallography , crystal structure , oxide , ion , yttrium , physics , organic chemistry , chromatography , laser , quantum mechanics , optics
The preparation of BaCeO 3 doped by neodymium and lutetium oxides (BaCe 0.8 Nd 0.2 O 2.9 , BaCe 0.8 Lu 0.2 O 2.9 ) has been performed by solid‐state reactions of BaCO 3 and CeO 2 with Nd 2 O 3 and Lu 2 O 3 , respectively. The compound BaCe 0.8 Lu 0.2 O 2.9 has been synthesized for the first time. The X‐ray measurements have showed that BaCe 0.8 RE 0.2 O 2.9 (RE = Nd, Lu) has an orthorhombic structure (space group Pnma ). The standard formation enthalpies of BaCe 0.8 RE 0.2 O 2.9 have been determined from solution calorimetry by combining the solution enthalpies of BaCe 0.8 RE 0.2 O 2.9 , a BaCl 2 + 0.8CeCl 3 + 0.2RECl 3 mixture in 1 M HCl with 0.1 M KI at 298.15 K and literature data. It has been determined that both of the above‐mentioned complex oxides are thermodynamically stable with regard to their decomposition into binary oxides at room temperature. It has been established thatBaCe 0.8 Nd 0.2 O 2.9 and BaCe 0.8 Lu 0.2 O 2.9 react with water, Al 2 O 3 and ZrO 2 at ambient temperatures. It has also been shown that the reactions with Al 2 O 3 , ZrO 2 and water forBaCe 0.8 Nd 0.2 O 2.9 are more thermodynamically favoured than those for BaCe 0.8 Lu 0.2 O 2.9 . (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)