Article
Chemistry, Multidisciplinary
Fatima Melit, Nedjemeddine Bounar, Shabana P. S. Shaikh, Manish Deshpande, Marlu Cesar Steil
Summary: This study investigated the synthesis and analysis of lanthanum and tin pyrochlores electrolytes for solid oxide fuel cell (SOFC) applications. Ceramic samples with different compositions were synthesized and characterized. The doping of strontium had a positive effect on the structural and electrical properties, leading to an increase in ionic conductivity and a decrease in activation energy. The La2-xSrxSn2O7-delta electrolyte shows potential for intermediate temperature SOFC applications.
Article
Chemistry, Physical
R. S. Rejith, Sam Solomon
Summary: The electrical properties of Gd2Zr2O7 ceramics depend on their structural stability, with different preparation methods and annealing temperatures leading to varying material structures that impact ion conduction. Investigating Gd2-xDyxZr1.5Hf0.5O7 nanoceramics revealed improved ionic conductivity with structural adjustments, reaching a maximum value.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
T. M. Cassol, A. R. Duarte, C. S. Ribas, P. R. G. Fernandes
Summary: Broadband Dielectric Spectroscopy (BDS) technique was applied to investigate two ionic liquids, MC1 and MC2, analyzing the variations of complex permittivity and complex conductivity with temperature. The results provide insights into the electrical properties of ionic liquids at different temperatures.
JOURNAL OF MOLECULAR LIQUIDS
(2021)
Article
Materials Science, Ceramics
Chitrarasu Kaliyaperumal, Sundeep Kumar Marndi, Amirthapandian Sankarakumar, Thangadurai Paramasivam
Summary: The influence of grain size on the electrical properties of nanocrystalline La2Zr2O7 (LZO) ceramics prepared by chemical co-precipitation was investigated. The XRD and Raman scattering analysis confirmed the pyrochlore structure of La2Zr2O7. SEM and XPS were used to study the morphology and chemical composition. Impedance spectroscopy revealed that the conductivity was contributed by both grains and grain boundaries, with a non-Debye nature of conduction. The activation energy for grain conduction was consistent across different grain sizes, while the activation energy for grain boundary conduction decreased with increasing grain size, indicating oxygen ion migration. The conduction mechanism was dominated by non-overlapping small polaron tunneling, and ion-ion correlation increased with larger grain size.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Ian A. Brummel, Kevin Wynne, William A. Lanford, Jon F. Ihlefeld
Summary: A combustion synthesis methodology was used to prepare perovskite Li3xLa1/3-xTaO3 lithium-ion conductors. Different lithium vapor overpressure conditions were achieved by sintering under different burial powder and cover crucible combinations. The ion conductivity was found to be influenced by the lithium content and secondary phase content in the samples.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Y. Bhaskara Rao, L. N. Patro
Summary: The structural and transport properties of Na3Zr2Si2PO12 synthesized by solid-state reaction and sol-gel techniques were compared, with the former showing higher conductivity. The impact of sintering temperatures on the transport results was investigated, as well as the role of excess sodium on the ionic conductivity of Na3Zr2Si2PO12.
Article
Chemistry, Multidisciplinary
Imen Gharbi, Abderrazek Oueslati, Ayten Ates, Abdelfattah Mahmoud, Mustapha Zaghrioui, Mohamed Gargouri
Summary: In addition to analyzing the morphological and structural properties, this study investigates and analyzes the temperature and frequency dependence of the electrical and dielectric properties of the CH3NH3HgCl3 compound. The results reveal the ferroelectric nature of the compound and provide insights into its thermally activated conduction mechanisms. The study also explores the relationship between frequency-dispersive dielectric spectra and conduction mechanisms.
Article
Chemistry, Physical
K. Ramakrushna Achary, Y. Bhaskara Rao, Dipak Bhosale, L. N. Patro
Summary: Recent reports have shown that fluoride ion batteries (FIBs) are promising alternatives to lithium-ion batteries due to their lower cost, abundant resources, and improved safety. However, the development of FIBs is still in its early stages, with one of the major challenges being the development of solid electrolytes with fast fluoride ion transport. This study focuses on the mechanochemical synthesis of NH4Sn2F5, a solid electrolyte, and investigates its structural and transport properties. The results show that NH4Sn2F5 has better conductivity at different temperatures compared to previously reported materials based on Na and K. The presence of NH4 cations in NH4Sn2F5 is found to enhance fluoride ion conductivity, making it a potential solid electrolyte for FIBs.
SOLID STATE IONICS
(2022)
Review
Materials Science, Ceramics
Anjana P. Anantharaman, Hari Prasad Dasari
Summary: Pyrochlore structure materials have unique crystal structure, electrical properties, and thermal stability, making them widely applicable in catalysis, nuclear waste encapsulation, sensors, and electronic devices. The ionic/electronic conductivity of these materials is crucial for their performance in solid oxide fuel cells, where factors like cation radius ratio, oxygen migration, vacancy formation, and dopant addition play significant roles in enhancing the conductivity. Research has shown that controlling these factors can improve the ion and electron transport properties of pyrochlore materials, ultimately leading to better performance in various applications.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Chaeeun Kim, Young-Il Kim
Summary: The ionic conductivity of complex rock-salt Li3TaO4 was studied by modifying the low-temperature and high-temperature polymorphs with Li/Ta non-stoichiometry. The results showed that the disordered low-temperature phase had higher ionic conductivity than the ordered high-temperature phase, and the Li/Ta non-stoichiometry contributed to an increase in the ionic conductivity of Li3TaO4.
CERAMICS INTERNATIONAL
(2023)
Article
Crystallography
Irina Vasilevna Sudzhanskaya, Yulia Sergeevna Nekrasova, Alexander Sergeevich Kubankin
Summary: Different ceramics samples were synthesized using a standard solid-state reaction method. The crystal structure and microstructure were characterized using X-ray analysis and electron microscopy. The ionic conduction properties of the samples were evaluated using ac impedance spectroscopy, and the activation energy was calculated. The density, microhardness, and crack resistance of the solid solutions were also measured.
Article
Materials Science, Multidisciplinary
Linhao Li, Teresa Roncal-Herrero, John Harrington, Steven J. Milne, Andy P. Brown, Julian S. Dean, Derek C. Sinclair
Summary: The study investigated the influence of adding a small amount of Bi2O3 on grain boundaries in high temperature dielectric solid solution series, leading to significant changes in conductivity and ion switch behavior. At low temperatures, grain boundaries act as electrically blocking layers, while they become highly conductive at higher temperatures due to a phase transition and melting of δ-Bi2O3.
Article
Chemistry, Physical
K. A. Niradha Sachinthani, Jenny R. Panchuk, Yuhang Wang, Tong Zhu, Edward H. Sargent, Dwight S. Seferos
Summary: Polymeric mixed ionic/electronic conductors (MIECs) with controlled structure and mechanically robust properties were prepared and investigated. Copolymers containing thiophene and selenophene repeat units showed significantly higher Li-ion conductivity and electronic conductivity compared to homopolymer counterparts, indicating potential for designing new MIECs.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Engineering, Chemical
Jose C. Diaz, Jovan Kamcev
Summary: Accurate measurements of membrane ionic conductivity are essential for understanding ion transport, but there is no standardized technique for such measurements. Discrepancies in reported ionic conductivity values for common commercial membranes are common. This study presents a non-invasive method based on electrochemical impedance spectroscopy to address external resistances in thin membranes equilibrated with dilute salt solutions.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Faten Nouri, Malika Trabelsi-Ayadi, Riadh Ternane
Summary: Phosphate-sulfate fluorapatites Ca10-xNax(PO4)(6-x)(SO4)(x)F-2 (x = 0, 3, 6) were synthesized by solid-state reaction and characterized using various techniques. The materials showed temperature-dependent electrical behavior and a typical negative temperature coefficient of resistance.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2022)
