High oxide-ion conductivity in Si-deficient La9.565(Si5.826□0.174)O26 apatite without interstitial oxygens due to the overbonded channel oxygens

2018 ◽  
Vol 6 (23) ◽  
pp. 10835-10846 ◽  
Author(s):  
Kotaro Fujii ◽  
Masatomo Yashima ◽  
Keisuke Hibino ◽  
Masahiro Shiraiwa ◽  
Koichiro Fukuda ◽  
...  
Keyword(s):  
Single Crystal ◽  
Ion Conductivity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxide Ion Conductivity ◽  
Ion Conductivities ◽  
Lanthanum Silicates ◽  
Oxide Ion ◽  
Apatite Type

Overbonding of the channel oxygens in the apatite-type lanthanum silicates was found to be a key for the high oxide-ion conductivities by the present single-crystal neutron and X-ray diffraction studies.

Single crystal growth and oxide ion conductivity of apatite-type rare-earth silicates

2004 ◽  
Vol 174 (1-4) ◽  
pp. 73-80 ◽  
Author(s):  
M HIGUCHI ◽  
Y MASUBUCHI ◽  
S NAKAYAMA ◽  
S KIKKAWA ◽  
K KODAIRA
Keyword(s):  
Rare Earth ◽  
Crystal Growth ◽  
Single Crystal ◽  
Single Crystal Growth ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Oxide Ion ◽  
Apatite Type

Effect of Mg substitution on crystal structure and oxide-ion conductivity of apatite-type lanthanum silicates

2010 ◽  
Vol 181 (21-22) ◽  
pp. 1024-1032 ◽  
Author(s):  
Tomohiro Kinoshita ◽  
Tomoyuki Iwata ◽  
Emilie Béchade ◽  
Olivier Masson ◽  
Isabelle Julien ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicates ◽  
Mg Substitution ◽  
Oxide Ion ◽  
Apatite Type

Re-investigation of the structure and crystal chemistry of the Bi2O3–W2O6 `type (Ib)' solid solution using single-crystal neutron and synchrotron X-ray diffraction

2010 ◽  
Vol 66 (2) ◽  
pp. 165-172 ◽  
Author(s):  
Neeraj Sharma ◽  
Rene B. Macquart ◽  
Maxim Avdeev ◽  
Mogens Christensen ◽  
Garry J. McIntyre ◽  
...  
Keyword(s):  
Solid Solution ◽  
Single Crystal ◽  
X Ray Diffraction ◽  
Cation Site ◽  
X Ray ◽  
Oxide Ion Conductivity ◽  
Solid Solution Region ◽  
Solution Region ◽  
First Time ◽  
Oxide Ion

Single crystals of composition Bi35.66W4.34O66.51 (or Bi8.2WO15.3, bismuth tungsten oxide), within the type (Ib) solid-solution region of the Bi2O3–WO3 system, were synthesized using the floating-zone furnace method. Synchrotron X-ray and neutron single-crystal diffraction data were used to confirm the previously tentative assignment of the room-temperature space group as I41. Fourier analysis of the combined X-ray and neutron datasets was used to elucidate and refine fully the cation and anion arrays for the first time. The mixed cation site M1 is shown to be coordinated by eight O atoms in an irregular cube when M = Bi, and by six O atoms in an octahedron when M = W. The resulting disorder in the average structure around M1 is discussed in the context of experimentally observed oxide-ion conductivity.

scholarly journals Synthesis and characterisation of new Bi(iii)-containing apatite-type oxide ion conductors: the influence of lone pairs

2017 ◽  
Vol 46 (37) ◽  
pp. 12494-12499 ◽  
Author(s):  
M. L. Tate ◽  
C. A. Fuller ◽  
M. Avdeev ◽  
H. E. A. Brand ◽  
G. J. McIntyre ◽  
...  
Keyword(s):  
Impedance Spectroscopy ◽  
Neutron Diffraction ◽  
Bond Valence ◽  
Ion Conductivity ◽  
X Ray ◽  
Oxide Ion Conductivity ◽  
Oxide Ion Conductors ◽  
Bond Valence Analysis ◽  
Oxide Ion ◽  
Apatite Type

New Bi-containing apatite-type germanates, characterised by X-ray and neutron diffraction, impedance spectroscopy and bond valence analysis, display high oxide ion conductivity.

scholarly journals Average and Local Structure of Apatite-Type Germanates and Implications for Oxide Ion Conductivity

2019 ◽  
Vol 58 (21) ◽  
pp. 14853-14862 ◽  
Author(s):  
Matthew S. Chambers ◽  
Philip A. Chater ◽  
Ivana Radosavljevic Evans ◽  
John S. O. Evans
Keyword(s):  
Local Structure ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Oxide Ion ◽  
Apatite Type

Enhanced oxide-ion conductivity of solid-state electrolyte mesocrystals

Nanoscale ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 4523-4530 ◽  
Author(s):  
Keishi Tsukiyama ◽  
Mihiro Takasaki ◽  
Naoto Kitamura ◽  
Yasushi Idemoto ◽  
Yuya Oaki ◽  
...  
Keyword(s):  
Rare Earth ◽  
Solid State ◽  
Self Assembly ◽  
Ion Conductivity ◽  
Solid State Electrolyte ◽  
Oxide Ion Conductivity ◽  
Ion Conductivities ◽  
Evaporation Induced Self Assembly ◽  
Rare Earth Doped ◽  
Oxide Ion

Enhanced oxide-ion conductivities were observed on mesocrystalline structures that were produced by evaporation-induced self-assembly of rare earth-doped CeO2 nanocubes 4–5 nm in size.

Effect of Manganese Dioxide Addition on the Cubic Phase Stability, Densification and Electrical Conductivity of Scandia-Stabilized Zirconia

2014 ◽  
Vol 975 ◽  
pp. 86-91
Author(s):  
Emanuelle Z. Santos ◽  
Reginaldo Muccillo
Keyword(s):  
Manganese Dioxide ◽  
Structural Phase ◽  
Rhombohedral Phase ◽  
Ion Conductivity ◽  
Cubic Phase ◽  
X Ray Diffraction ◽  
Shrinkage Temperature ◽  
Oxide Ion Conductivity ◽  
Probe Microscope ◽  
Oxide Ion

Zirconia stabilized with 8-12 mol% scandia shows the highest value of oxide ion conductivity among zirconia-based oxides. However, the cubic-rhombohedral phase transition at approximately 600 °C prevents its use as high temperature solid electrolyte. To circumvent this problem, additives have been proposed. In this work, ZrO2:10 mol% Sc2O3 was mixed to MnO2 and sintered at 1200 oC/2 h + 1450 °C/2 h with addition of 1, 1.5, 2 and 2.5 mol% MnO2. All specimens were analyzed by X-ray diffraction for structural phase evaluation and dilatometry for densification. Polished and thermally etched surfaces were observed in scanning electron microscope and scanning probe microscope. Impedance spectroscopy measurements were carried out in the frequency range 5 Hz-13 MHz in the 300-500 oC temperature range. The main results show that the manganese dioxide addition prior to sintering leads to the formation of single cubic phase, to the reduction of the maximum shrinkage temperature, and to an increase in the value of the total oxide ion conductivity.

Doping strategies to optimise the oxide ion conductivity in apatite-type ionic conductors

2004 ◽  
pp. 3106 ◽  
Author(s):  
A. Najib ◽  
J. E. H. Sansom ◽  
J. R. Tolchard ◽  
P. R. Slater ◽  
M. S. Islam
Keyword(s):  
Ion Conductivity ◽  
Ionic Conductors ◽  
Oxide Ion Conductivity ◽  
Oxide Ion ◽  
Apatite Type

Preparation of Oxygen Ion Conducting Doped Lanthanum Gallate Thin Films on Amorphous and Single Crystal Substrates by Pulsed Laser Deposition

2003 ◽  
Vol 796 ◽  
Author(s):  
Fumiaki Mitsugi ◽  
Seiji Kanazawa ◽  
Toshikazu Ohkubo ◽  
Yukiharu Nomoto ◽  
Yusaku Takita ◽  
...  
Keyword(s):  
Thin Films ◽  
Single Crystal ◽  
Pulsed Laser Deposition ◽  
Complex Impedance ◽  
Pulsed Laser ◽  
Ion Conductivity ◽  
Laser Deposition ◽  
Lanthanum Gallate ◽  
Oxide Ion Conductivity ◽  
Oxide Ion

ABSTRACTAn La1-xSrxGa1-y-zMgyCozO3-(x+y+z)/2 (LSGMCO) has attracted much attention because it can be useable as an electrolyte of a solid oxide fuel cell due to its high oxide ion conductivity. We prepared LSGMCO thin films on silica glass and LaAlO3 single crystal substrates by pulsed laser deposition and evaluated their properties. LSGMCO thin films deposited at 800°C were poly-crystal and the deposition pressure affected their surface morphologies. In the case of the LaAlO3 single crystal substrate, a c-axis oriented LSGMCO thin film was obtained. DC conductivity and complex impedance of LSGMCO thin films were measured in vacuum atmosphere to investigate the effect of the crystal orientation on the oxide ion conductivity. It was revealed that resistance at a grain boundary of films is more dominant compare with the grain interior.

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