Investigation of the atomic arrangement in the high-temperature proton conductor Ba3Ca1.18Nb1.82O9−δ + yD2O

Lind, K. R.; Sosnowska, I.; Hempelmann, Rolf; Schäfer, Wolfgang; Knight, Kevin S.

doi:10.1016/s0921-4526(96)01217-3

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…Time-of-flight, usec A new long-range order of D 2 O in this sample was observed for the first time by Lind et al [36]. In Fig.…”

Section: 16000 16500 17000supporting

confidence: 57%

“…In Fig. 6 the neutron diffraction patterns of Ba 3 Cai l8 Nb] 82 O 9 .5 + xD 2 0 with and without water are shown [36]. This result was obtained using the TOF neutron diffractometer LAD at ISIS [27].…”

Section: 16000 16500 17000mentioning

confidence: 76%

“…BiFeO 3 [24] or CaMn 7 O 12 [35]). There are also perovskites that show high temperature ionic proton conductivity [36].…”

Section: Crystal and Magnetic Ordering In Perovskite Oxidesmentioning

confidence: 99%

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Oxides: neutron and synchrotron X-ray diffraction studies

Sosnowska

Shiojiri

1999

Journal of Electron Microscopy

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We shall review some results from several areas of oxide science in which neutron scattering and X-ray synchrotron scattering exercise a complementary role to high-resolution transmission electron microscopy. The very highresolution time-of-flight neutron diffraction technique and its role in studies of the magnetic structure of oxides will especially be reviewed. The selected topics of structural studies for the chosen oxides are: crystal and magnetic structure of the so-called cellular random systems, magnetic structure and phase transitions in ferrites and the behaviour of water in non-stoichiometric protonic conductors and in the opal silica-water system.

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“…Time-of-flight, usec A new long-range order of D 2 O in this sample was observed for the first time by Lind et al [36]. In Fig.…”

Section: 16000 16500 17000supporting

confidence: 57%

Section: 16000 16500 17000mentioning

confidence: 76%

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Oxides: neutron and synchrotron X-ray diffraction studies

Sosnowska

Shiojiri

1999

Journal of Electron Microscopy

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“…Structures of the BCNs are reported to be highly composition dependent. Hexagonal, face-centred cubic and simple cubic structures were observed, which have different extend of ordering of Ca and Nb in the lattices (1,(13)(14)(15). Faced-centred cubic Fm-3m structures was reported on the Ta-doped and Ti-doped BCNs by Bhella et al and Trinh et al respectively (11,16).…”

Section: Structural Analysismentioning

confidence: 91%

Development of Novel Fe-Doped Barium Calcium Niobates as Promising Mixed Conductors for Solid Oxide Fuel Cells (SOFCs)

et al. 2011

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Synthesis, structural analysis, chemical stabilities and electrochemical measurements of a new Fe-doped barium calcium niobates (Fe-BCNs) family as promising mixed conductors for SOFCs were reported. The Fe-BCNs, prepared by conventional solid state method, exhibited as single phases which can be indexed as Fm-3m (space group no. 225) structure with cell parameter a ~ 8.4 Aå by PXRD and SAED. The Fe-BCNs showed superior chemical stability in pure CO2 gas at 800oC for 24 h, boiling H2O for 72 h, 30 ppm H2S at 600oC for 24 h and pure CH4 gas at 600oC for 12 h, confirmed by PXRD. The highest total conductivity of 1.3 × 10-2 Scm-1 (Ea~0.5eV) was found for Ba2Ca0.787Fe0.566Nb0.646O6-δ at 400oC in air.

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“…Two series from the literature are included in the plot showing good agreement [7,8]. Other values for BCN18 have been included as well [9][10][11][12]; the scatter in the literature is due to higher lattice parameters in protonated samples.…”

Section: Xrdmentioning

confidence: 99%

Influence of the calcium excess in the structural and spectroscopic properties of the complex perovskite Ba3CaNb2O9

et al. 2012

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The effects of the change in the Ca/Nb ratio in the structure and spectroscopic properties of the solid solution Ba 3 Ca 1+x Nb 2-x O 9-δ with x00-0.25 are investigated. The solid solution undergoes a transition from an hexagonal phase (2:1 order) to a cubic phase (1:1 order) with increasing calcium content as indicated by X-Ray diffraction and Raman. The calcium excess matches with a gradual increase in blue colour due to a reduction at the high temperatures of sintering. Optical absorption experiments showed that there are different absorption bands in the region 0.45-4.5 eV corresponding tentatively to OH vibrations, polarons and monovalent oxygen vacancies. The series properties change gradually with calcium excess with the exception of Ba 3 Ca 1.18 Nb 1.82 O 9-δ that showed a slight change attributable to the presence of protons in the lattice. These changes can be used to quantify protons in complex perovskites.

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Investigation of the atomic arrangement in the high-temperature proton conductor Ba3Ca1.18Nb1.82O9−δ + yD2O

Cited by 8 publications

References 5 publications

Oxides: neutron and synchrotron X-ray diffraction studies

Oxides: neutron and synchrotron X-ray diffraction studies

Development of Novel Fe-Doped Barium Calcium Niobates as Promising Mixed Conductors for Solid Oxide Fuel Cells (SOFCs)

Influence of the calcium excess in the structural and spectroscopic properties of the complex perovskite Ba3CaNb2O9

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