Enhanced oxide-ion conductivity in highly c-axis textured La₁₀Si₆O₂₇ceramic

Textured LiFePO4 Bulk with Enhanced Electrical Conductivity

“…Then the liquid LiFePO4 crystallized from bottom to top and a preferred growth direction appeared, which is the main reason for the formation of highly textured LiFePO4 bulk. It is noted that a similar phenomenon was observed in our previous report …”

“…It is noted that a similar phenomenon was observed in our previous report. 15 Figure 2(a) shows a general cross-section SEM view of arc-melted LiFePO 4 bulk. It is apparent that there is columnar grain structure and we noted that the growth orientation of the columnar grain is perpendicular to the Cu substrate of the arc furnace.…”

Phase stability and high conductivity of ScSZ nanofibers: effect of the crystallite size

“…8 To lower the operating temperature to 500-700 C, tremendous efforts have been devoted to the investigation of new families of materials with a higher mobility, like ceriabased oxides, 9,10 perovskites, [11][12][13] and apatite-type silicates. 14 However, the poor mechanical strength and chemical and structural instability of these materials restrict their practical applications. 8 Scandia-stabilized zirconia (ScSZ) materials are potential candidates as solid electrolytes for intermediate-temperature applications due to their excellent mechanical properties and superior conductivities.…”

Hydrothermal Synthesis and Characterization of an Apatite‐Type Lanthanum Silicate Ceramic for Solid Oxide Fuel Cell Electrolyte Applications

“…As a result, high conduction has been reported via an interstitial pathway mechanism in which the interstitial oxygen ions pass through cavities located between La channels and isolated SiO 4 tetrahedra along the c ‐axis. This is in contrast to the oxide ion vacancy mechanism observed for perovskites and fluorite‐type oxide ion conductors . Additionally, solid state 29 Si NMR studies of apatite‐type silicates have confirmed the presence of interstitial oxygen sites that are correlated with the Si environment and the ionic conductivity …”

“…This is in contrast to the oxide ion vacancy mechanism observed for perovskites and fluorite-type oxide ion conductors. [17][18][19][20][21][22][23] Additionally, solid state 29 Si NMR studies of apatite-type silicates have confirmed the presence of interstitial oxygen sites that are correlated with the Si environment and the ionic conductivity. [24] On the other hand, preparation of highly electrical conducting lanthanum silicate samples with the phase purity and sintering temperature lower than 1700 o C remains a challenge to date.…”