Oxide-Ion Conductivity Enhancement of Polycrystalline Lanthanum Silicate Oxyapatite Induced by BaO Doping and Grain Alignment

2016 ◽  
Vol 16 (8) ◽  
pp. 4519-4525 ◽  
Author(s):  
Koichiro Fukuda ◽  
Ryoji Watanabe ◽  
Masayuki Oyabu ◽  
Ryo Hasegawa ◽  
Toru Asaka ◽  
...  
Keyword(s):  
Ion Conductivity ◽  
Grain Alignment ◽  
Conductivity Enhancement ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion

Combined Effect of Germanium Doping and Grain Alignment on Oxide-Ion Conductivity of Apatite-Type Lanthanum Silicate Polycrystal

2012 ◽  
Vol 24 (13) ◽  
pp. 2611-2618 ◽  
Author(s):  
Koichiro Fukuda ◽  
Toru Asaka ◽  
Nobuo Ishizawa ◽  
Hiroki Mino ◽  
Daisuke Urushihara ◽  
...  
Keyword(s):  
Ion Conductivity ◽  
Combined Effect ◽  
Grain Alignment ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion ◽  
Apatite Type

Morphology and oxide-ion conductivity of flux grown single crystals of BaO-doped lanthanum silicate oxyapatite

2020 ◽  
Vol 346 ◽  
pp. 115219 ◽  
Author(s):  
Koichiro Fukuda ◽  
Takuya Eguchi ◽  
Fuminori Maekawa ◽  
Daisuke Urushihara ◽  
Toru Asaka ◽  
...  
Keyword(s):  
Single Crystals ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion

scholarly journals Structural and Electrochemical Properties of Lanthanum Silicate Apatites La10Si6−x−0.2AlxZn0.2O27−δ for Solid Oxide Fuel Cells (SOFCs)

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shammya Afroze ◽  
Hidayatul Qayyimah Hj Hairul Absah ◽  
Md Sumon Reza ◽  
Mahendra Rao Somalu ◽  
Jun-Young Park ◽  
...  
Keyword(s):  
Electrochemical Impedance Spectroscopy ◽  
Impedance Spectroscopy ◽  
Electrochemical Impedance ◽  
Solid Oxide ◽  
Ion Conductivity ◽  
Oxide Fuel ◽  
X Ray ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion

An excellent oxide ion conductivity with high oxygen transportation of lanthanum silicate apatite at the solid oxide fuel cell (SOFC) can be achieved through the solid-state reaction method. The doped La10Si6−x−0.2AlxZn0.2O27−δ (x = 0.2 and 0.4) materials sintered at 1600°C accomplished crystallinity and crystal structure of apatite-type. The structural and electrochemical characterizations of La10Si6−x−0.2AlxZn0.2O27−δ (x = 0.2 and 0.4) were executed using X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and electrochemical impedance spectroscopy (EIS) measurements. The total oxide ion conductivities of La10Si6−x−0.2AlxZn0.2O27−δ (x = 0.2 and 0.4) were measured from low to intermediate operating temperature range (450 to 800°C) using electrochemical impedance spectroscopy. Room temperature XRD patterns of La10Si6−x−0.2AlxZn0.2O27−δ (x = 0.2 and 0.4) exhibited La10Si6O27 apatite phase with space group P63/m as the main phase with the minor appearance of La2SiO5 as an impurity phase. The highest total oxide ion conductivity of 3.24 × 10−3 Scm−1 and corresponding activation energy of 0.30 eV at 800°C were obtained for La10Si5.6Al0.2Zn0.2O26.7 which contains a low concentration of Al3+ dopant.

Oxide-Ion Conductivity of Highlyc-Axis-Oriented Apatite-Type Lanthanum Silicate Polycrystal Formed by Reactive Diffusion between La2SiO5and La2Si2O7

2011 ◽  
Vol 23 (24) ◽  
pp. 5474-5483 ◽  
Author(s):  
Koichiro Fukuda ◽  
Toru Asaka ◽  
Ryuta Hamaguchi ◽  
Takahiro Suzuki ◽  
Hideki Oka ◽  
...  
Keyword(s):  
Ion Conductivity ◽  
Reactive Diffusion ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion ◽  
Apatite Type

Crystal Structure and Oxide-Ion Conductivity along c-Axis of Si-Deficient Apatite-Type Lanthanum Silicate

2013 ◽  
Vol 25 (10) ◽  
pp. 2154-2162 ◽  
Author(s):  
Koichiro Fukuda ◽  
Toru Asaka ◽  
Shinji Hara ◽  
Masayuki Oyabu ◽  
Abid Berghout ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Lanthanum Silicate ◽  
Oxide Ion ◽  
Apatite Type

Crystal Structure and Oxide-Ion Conductivity along c-Axis of Apatite-Type Lanthanum Silicate with Excess Oxide Ions

2012 ◽  
Vol 24 (23) ◽  
pp. 4623-4631 ◽  
Author(s):  
Koichiro Fukuda ◽  
Toru Asaka ◽  
Masayuki Oyabu ◽  
Daisuke Urushihara ◽  
Abid Berghout ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Oxide Ions ◽  
Lanthanum Silicate ◽  
Oxide Ion ◽  
Apatite Type

Oxide Ion Conductivity, Phase Transitions, and Phase Separation in Fluorite-Based Bi38−xMo7+xO78+1.5x

2010 ◽  
Vol 22 (15) ◽  
pp. 4484-4494 ◽  
Author(s):  
Xiaojun Kuang ◽  
Yuandi Li ◽  
Chris D. Ling ◽  
Ray L. Withers ◽  
Ivana Radosavljević Evans
Keyword(s):  
Phase Transitions ◽  
Phase Separation ◽  
Ion Conductivity ◽  
Oxide Ion Conductivity ◽  
Oxide Ion
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