Analysis of the conduction mechanisms of the Ni doped apatite‐type lanthanum silicate electrolyte ceramics synthesized by the combustion method

2021 ◽  
Author(s):  
Shi Chen ◽  
ZhiLiang Huang ◽  
ChangLian Chen ◽  
Pu Hu ◽  
JiangSheng Huang ◽  
...  
Keyword(s):  
Combustion Method ◽  
Conduction Mechanisms ◽  
Lanthanum Silicate ◽  
Apatite Type

Low-temperature sintering of dense lanthanum silicate electrolytes with apatite-type structure using an organic precipitant synthesized nanopowder

2009 ◽  
Vol 24 (1) ◽  
pp. 237-244 ◽  
Author(s):  
Seung Hwan Jo ◽  
P. Muralidharan ◽  
Do Kyung Kim
Keyword(s):  
Electron Microscopy ◽  
Low Temperature ◽  
Type Structure ◽  
Degree Of Crystallinity ◽  
Polished Surface ◽  
Synthetic Approach ◽  
Low Temperature Sintering ◽  
Lanthanum Silicate ◽  
Microscopy Images ◽  
Apatite Type

Highly sinterable La10Si6O27 and La10Si5.5M0.5O27 (M = Mg, and Al) nanopowders with apatite-type structure have been synthesized via a homogeneous precipitation method using diethylamine (DEA) as a precipitant. The synthetic approach using an organic precipitant with dispersant characteristics is advantageous in configuring weakly agglomerated nanopowders, leading to desirable sintering activity. X-ray diffraction powder patterns confirmed the single-phase crystalline lanthanum silicate of hexagonal apatite structure at 800 °C, which is a relatively lower calcination temperature compared to conventionally prepared samples. Transmission electron microscopy images revealed particles ∼30 nm in size with a high degree of crystallinity. A dense grain morphology was recognized from the scanning electron microscopy images of the polished surface of the pellets that were sintered at 1400 and 1500 °C for 10 h. This low-temperature sintering is significant because conventional powder processing requires a temperature above 1700 °C to obtain the same dense electrolyte. The doped-lanthanum silicate electrolyte prepared by the DEA process and sintered at 1500 °C for 10 h exhibited electrical conductivity comparable with samples prepared at much higher sintering temperature (>1700 °C).

Fabrication and ionic conductivity of oriented lanthanum silicate films with apatite-type structure

2016 ◽  
Vol 293 ◽  
pp. 51-55 ◽  
Author(s):  
Mitsumasa Sakao ◽  
Tsuguo Ishihara ◽  
Hideki Yoshioka
Keyword(s):  
Ionic Conductivity ◽  
Type Structure ◽  
Lanthanum Silicate ◽  
Apatite Type

Low Temperature Synthesis of Lanthanum Silicate Apatite Type by Modified Sol Gel Process

2014 ◽  
Vol 975 ◽  
pp. 143-148 ◽  
Author(s):  
Agatha Matos Misso ◽  
Daniel Ricco Elias ◽  
Fernando dos Santos ◽  
Chieko Yamagata
Keyword(s):  
Colloidal Silica ◽  
High Efficiency ◽  
Ceramic Body ◽  
Low Cost ◽  
Sol Gel ◽  
Lanthanum Nitrate ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia ◽  
Lanthanum Silicate ◽  
Apatite Type

Rare earth silicate apatite type is a very important and promising material for application as an electrolyte in IT-SOFC (Intermediate Temperature Solid Oxide Fuel Cell). Lanthanum silicate apatite, La9,33Si6O26, exhibits high conductivity and has high efficiency, long term stability, fuel flexibility, low emissions and relatively low cost compared to yttria stabilized zirconia (YSZ - yttria stabilized zirconia), at temperatures between 600 to 800 °C. One of the problems of YSZ is its high operating temperature which results in long starting times and problems of mechanical and chemical compatibility. The interest of investigating lanthanum silicate apatite as an electrolyte is to overcome the problems caused by high temperature operation required by YSZ electrolyte. In the present study, sol-gel method was used to synthesize La9,33Si6O26. Initially, the reagents (sodium silicate and lanthanum nitrate) were mixed to obtain colloidal silica. Then, this gel containing lanthanum nitrate was thermally treated to allow the melting of lanthanum nitrate salt distributed on colloidal silica. The aim of this study was to verify if this method permits the formation of La9,33Si6O26 pure apatite phase, in order to obtain fine powders and uniform particles for further processing and obtaining a ceramic body.

scholarly journals Fabrication of apatite-type lanthanum silicate films and anode supported solid oxide fuel cells using nano-sized printable paste

2014 ◽  
Vol 34 (2) ◽  
pp. 373-379 ◽  
Author(s):  
Hideki Yoshioka ◽  
Hiroyuki Mieda ◽  
Takahiro Funahashi ◽  
Atsushi Mineshige ◽  
Tetsuo Yazawa ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Lanthanum Silicate ◽  
Apatite Type

Facile preparation of apatite-type lanthanum silicate by a new water-based sol–gel process

2013 ◽  
Vol 48 (6) ◽  
pp. 2227-2231 ◽  
Author(s):  
Chieko Yamagata ◽  
Daniel R. Elias ◽  
Mayara R.S. Paiva ◽  
Agatha M. Misso ◽  
Sonia R.H. Mello Castanho
Keyword(s):  
Sol Gel ◽  
Sol Gel Process ◽  
Water Based ◽  
Facile Preparation ◽  
Lanthanum Silicate ◽  
Apatite Type
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