Morphological control for high proton conduction in robust CoO-diethylmethylamine (metal-organic framework) membrane.

Metal-organic framework (MOF) based proton conductors are synthesized by the Avrami model (time-temperature modalities). Our objective here is to obtain a material with high proton conductivity in anhydrous conditions, improved catalytic behaviour and morphology control of conductivity, band gap and catalysis. For this purpose, we try to understand the role of morphology on mass transportation using computational fluid dynamics and the experimental realisation using the synthesis of MOF membranes with high protonic conductivity.

Overlapping large polaron tunnelling in lanthanum silicate oxyapatite.

Amongst the various fast ion conductors, lanthanum excess lanthanum silicate oxyapatite (La10-α(SiO)O2+δ) has shown higher oxide ion conductivity with lower activation energy. On the other hand, the activation energy increases with La vacancies (La at 4f site). In the present work, La site is altered with Ca to form (La1-xCa)(SiO)O2+δ(x=0.

Influence of the crystalline phase on the electrocatalytic behaviour of SmSrNiO ( = 0.4 to 1.0) Ruddlesden-Popper-based systems: a comparative study of bulk and thin electrocatalysts.

Herein, the influence of compositional engineering active site alternation on catalytic behaviour has been studied for the Ruddlesden-Popper-based system SmSrNiO. A phase change from orthorhombic ( = 0.6) to tetragonal ( = 1.

Hysteresis in centrosymmetric CuPbIperovskite halide: apolar dielectric or orientable dielectric?

We demonstrated the change in polarization behaviour at the surface/interface before and after light through Havriliak-Negami equation of lesser known CuPbI. We have synthesized CuPbIthrough cold sintering technique and the polarization mechanisms are altered by increasing (cold) sintering temperature. The structure of CuPbIwas not known and we predicted it to be hexagonal (R3̄m) with 21R prototype representation.

Microstructural dependent oxygen reduction reaction in a Ruddlesden-Popper perovskite (SmSr)NiO.

Rare earth nickelate perovskites have very wide uses, as magnetic insulators, as well as being conducting materials for the various components of solid oxide fuel cells (SOFCs) due to them undergoing an insulator to metal transition below operating temperature. In SOFCs, the microstructural design of electrode materials is an important aspect for electron and oxygen ion conduction at the electrolyte-electrode and electrode-air interfaces. To investigate this feature, a Ruddlesen-Popper structured layered perovskite, (SmSr)NiO4-δ, was synthesized at different sintering temperatures using a solid-state reaction technique.

Porous and highly conducting cathode material PrBaCoO: bulk and surface studies of synthesis anomalies.

The paradigm that chemical synthesis reduces the sintering temperature as compared to solid state synthesis seems to be violated in the case of the PrBaCo2O6-δ double perovskite. The sintering temperatures for pure phase samples synthesized through the solid state route (P-SSR) and the auto-combustion route (P-ACR) were found to be 1050 and 1150 °C, respectively. The porous microstructure of P-SSR is suitable for SOFC cathode materials while that of P-ACR is pore free.

Sm/Ti co-substituted bismuth ferrite multiferroics: reciprocity between tetragonality and piezoelectricity.

BiFeO (BFO) systems co-modified with Ti, Sm and Sm-Ti have been investigated for piezoelectricity together with dielectric and multiferroic properties. Structural studies revealed the coexistence of orthorhombic and rhombohedral (R3c) phases for x > 0.12.