scholarly journals “Free” Volume Expansion and Formation Enthalpy of Defects as Key Parameters Tuning the Oxide Ionic Conductivity in Derivatives of β-La2Mo2O9

2014 ◽  
Vol 26 (23) ◽  
pp. 6838-6851 ◽  
Author(s):  
Gwenaël Corbel ◽  
Ania Selmi ◽  
Emmanuelle Suard ◽  
Philippe Lacorre
Keyword(s):  
Ionic Conductivity ◽  
Free Volume ◽  
Volume Expansion ◽  
Formation Enthalpy ◽  
Parameters Tuning ◽  
Oxide Ionic Conductivity ◽  
Derivatives Of

Low-Temperature Prepared Multi-Elements Doped CeO2 Electrolyte

2009 ◽  
Author(s):  
Horng-Yi Chang ◽  
Yao-Ming Wang
Keyword(s):  
Ionic Conductivity ◽  
Low Temperature ◽  
Mixed Oxide ◽  
Sintering Temperature ◽  
Solid Oxide ◽  
Evaporation Method ◽  
Pure Phase ◽  
Doped Ceo2 ◽  
Oxide Ionic Conductivity ◽  
Homogeneous Composition

CeO2 materials doped with the di- or tri-valent metals possess high oxide ionic conductivity at low temperature for potential electrolyte use in intermediate temperature solid oxide fuel cell (SOFC). However, multi-elements doped CeO2-based electrolyte, (La1-x-ySrxBay)0.175Ce0.825O2-δ (LSBC) in this work, with pure phase is difficultly synthesized at low calcination temperature. High sintering temperature, e.g. > 1500°C, is also needed in conventional mixed oxide method. In this work, nanoparticles less than 50nm of LSBC can be prepared by solution-evaporation method at constant temperature. Pure fluorite crystal structure can be obtained lower than 700°C. The optimal mole ratio of LSBC/citric acid in prepared solution is 1/2 to achieve homogeneous composition and pure phase of LSBC. Small grain size of about 1μm average is observed for 1300°C-microwave sintered LSBC by solution-evaporation method. The ionic conductivity of 1400°C-conventional sintered and 1300°C-microwave sintered LSBC prepared by solution-evaporation method is about 0.006 S/cm at 600°C but less than 0.004 S/cm at 600°C even for 1500°C-conventional sintered LSBC prepared by mixed oxide method.

Study on structure and oxide ionic conductivity for new compound Ce6−xLnxMoO15−δ

2006 ◽  
Vol 408-412 ◽  
pp. 645-648 ◽  
Author(s):  
Ping Che ◽  
Qibing Bo ◽  
Jing Feng ◽  
Qiuyan Wang ◽  
Xueqiang Cao ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Oxide Ionic Conductivity

scholarly journals Local Structure Adaptations and Oxide Ionic Conductivity in the Type III Stability Region of (1 – x)Bi2O3·xNb2O5

2018 ◽  
Vol 30 (10) ◽  
pp. 3387-3394 ◽  
Author(s):  
Julia Wind ◽  
Neeraj Sharma ◽  
Aleksey A. Yaremchenko ◽  
Vladislav V. Kharton ◽  
Douglas A. Blom ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Local Structure ◽  
Stability Region ◽  
Type Iii ◽  
Oxide Ionic Conductivity

Free‐volume model for ionic conductivity in polymers

1973 ◽  
Vol 44 (12) ◽  
pp. 5372-5376 ◽  
Author(s):  
Teruo Miyamoto ◽  
Kyoichi Shibayama
Keyword(s):  
Ionic Conductivity ◽  
Free Volume ◽  
Volume Model ◽  
Free Volume Model

Improved hydration resistance of magnesia by EDTA and ammonium phosphate as additives

2017 ◽  
Vol 24 (1) ◽  
pp. 29-33
Author(s):  
Wenzheng Zhang ◽  
Bin Chen ◽  
Jiangnan Mou ◽  
Danyang Wang
Keyword(s):  
Ionic Conductivity ◽  
Ethylene Diamine Tetraacetic Acid ◽  
Volume Expansion ◽  
Particle Distribution ◽  
Ammonium Phosphate ◽  
Ethylene Diamine ◽  
Tetraacetic Acid ◽  
Volumetric Expansion ◽  
Key Factor ◽  
Hydration Resistance

AbstractThe control of magnesia (MgO) hydration ratio is a key factor in refractory slurry processing. The volumetric expansion that follows this reaction can result in MgO product cracks as MgO greatly tends to react with water. Thus, the antihydration of MgO is a key concern in refractory suspension processing. The performances of ammonium phosphate (AP) and ethylene diamine tetraacetic acid (EDTA) as antihydration additives were evaluated by using hydration tests, and ionic conductivity, pH, and particle distribution of MgO powders in water and ethanol were used to provide information related to the MgO powder in different liquids. The results showed that the antihydration additives AP and EDTA can inhibit MgO hydration to some extent; however, AP was more effective in preventing volume expansion.

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