Structure and decomposition of ceramic Ba3Y4O9

Szymanik, Barbara; Buckley, R. G.; Trodahl, H. J.; Davis, Rebecca L.

doi:10.1016/s0167-2738(98)00087-3

Cited by 12 publications

(16 citation statements)

References 2 publications

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“…Its movement in a loosely coupled polyhedral network should be even more facile than in a periodic rigid lattice and allow for a weakly activated transport through the surface to an acceptor molecule. Such 'assisted' ionic conductivity was also observed in other complex systems [26] and is also applied in other systems requiring facile ion transport through heterogeneous interfaces [27]. The relevance of metastable structurally unique interface layers for oxidation processes of metals was elucidated in detail by theoretical techniques [28].…”

Section: Resultsmentioning

confidence: 90%

Surface texturing of Mo–V–Te–Nb–O x selective oxidation catalysts

et al. 2006

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The paper concentrates on the study of Mo-V-Te-Nb oxide mixtures by electron microscopy combined with catalytic investigation of these materials in the partial oxidation of propane. Surface texturing of catalyst particles composed of two phases referred to in the literature as M1 and M2 is revealed by high-resolution transmission electron microscopy of high performing catalysts. The chemical composition of the catalyst surface is modified by treatment in water to obtain a significant increment in yield of acrylic acid. A chemical realization of the site isolation concept recurring on a supramolecular arrangement of catalyst and reactant rather than on atomic site isolation is suggested. A complex Mo-V-Te-Nb-Ox precursor phase carries nanoparticles made from a network of oxoclusters active as catalyst for the conversion of propane to acrylic acid. The designed synthesis of the multielement oxide bulk and of the surface structure with a different composition than the precursor phase improved the performance by a factor of 4.

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Section: Resultsmentioning

confidence: 90%

Surface texturing of Mo–V–Te–Nb–O x selective oxidation catalysts

et al. 2006

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“…Feng and Goodenough confirmed the Ba 3 Y 4 O 9 compound decomposed to Y 2 O 3 and BaCO 3 at 750°C in air . At room temperature, the Ba 3 Y 4 O 9 compound was reported to be unstable in air due to hydrated decomposition reactions by absorbing moisture from air …”

Section: Literature Survey On the Bao–y2o3–mno2 Systemmentioning

confidence: 98%

“…35 At room temperature, the Ba 3 Y 4 O 9 compound was reported to be unstable in air due to hydrated decomposition reactions by absorbing moisture from air. 33,35 Compounds Ba 2 Y 2 O 5 and Ba 4 Y 2 O 7 were demonstrated to be oxycarbonates. 36,37 They were obtained when BaCO 3 was used as a starting material, 34,38 but disappeared as carbonate was not present.…”

Section: Literature Survey On Thementioning

confidence: 99%

“…The phase diagram of the BaO–Y 2 O 3 system has been intensively investigated. Four compounds have been reported: BaY 2 O 4 , Ba 3 Y 4 O 9 , Ba 2 Y 2 O 5 , and Ba 4 Y 2 O 7 …”

Section: Literature Survey On the Bao–y2o3–mno2 Systemmentioning

confidence: 99%

“…The phase diagram of the BaO-Y 2 O 3 system has been intensively investigated. Four compounds have been reported: [31][32][33][34][35][36][37][38] Compound BaY 2 O 4 has the CaFe 2 O 4 -type structure in an orthorhombic symmetry with S.G. Pnma and lattice parameters of a = 10.3955 (1), b = 3.4503 (1), and c = 12.1157 (1) A at room temperature. 31 Lopato et al 32 reported that the optimum synthesis temperature for the BaY 2 O 4 compound was 1200°C, and the compound decomposed to Y 2 O 3 and Ba 3 Y 4 O 9 at 1400°C in air.…”

Section: Literature Survey On Thementioning

confidence: 99%

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Subsolidus Phase Relations of the BaO–Y₂O₃–MnO₂ System in Air

Wang

Gao

et al. 2012

J. Am. Ceram. Soc.

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The subsolidus phase relations of the BaO–Y2O3–MnO2 system have been investigated in air. There are eight binary compounds, a new ternary compound and 11 three‐phase regions in this system. The ternary compound with the BaO:YO1.5:MnO2 molar ratio of 8:2:5 was indexed by a rhombohedral lattice with a = 5.7929 (6) and c = 28.586 (4) Å. The synthesized compounds were determined to be stoichiometric except for the Ba1−xYxMnO3 phase (x ≤ 0.01).

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