Assignment Task
Introduction
1.1 Background of the Study
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Get Help Now!The class of compounds having a cubic lattice structure or ABX3 crystal structure are called perovskites and the structure is known as perovskite structure, where ’A’ and ’B’ are two cations of very different sizes, and X is an anion that bonds to both. The role of perovskite oxides (ABO3) is significant in developing and providing sustainable energy by clean and efficient energy conversion from chemical to electrical energy and membrane-based oxy-fuel combustion technology since it is used as electrode or electrolyte components in solid oxide fuel cells (SOFCs), as oxygen separation membranes and as membrane based reactors. The ability to dope their ABO3−d lattice with various Asite and B-site metal elements to form a ferro active compound helps in enhancing the electronic conductivity, the oxygen reduction reaction activity and the oxygen ionic conductivity of the perovskite oxide [1], making it a useful mixed ionic electronic conductor (MIEC) which conduct both ions and electronic charge carriers (electrons and/or holes). The state-of-the-art electrolysis cells (SOECs) and SOFCs use electrodes made of MIEC materials.
1.2 Motivation for the study
The capabilities of these integrated perovskite membranes are not fully developed yet, even though there are multiple advantages associated with these membranes like low cost of energy when compared to the conventional oxygen production[1]. In the case of barium ferrite oxide BaFeO3−δ which usually exists as a multi phase compound, there is an ionic radius mismatch between Ba and Fe. Recently many investigations are happening to stabilize the cubic lattice structure focusing on the effects of B-site doping with Ferro active highly charged metal elements like Nb cations and on the optimisation of doping strategies. Most of the work emphasises on the performance of newly developed materials and its conduction properties, and hence there are only limited literature’s associated with mechanical properties and characterization based on its which completely defines the purpose of the work.
2 Aims and Objectives
2.1 Aim
The main purpose of the work is to prepare Ba1–xLaxFe1–yNbyO3–δ (0 ≤ x and y ≤ 0.1) MIEC perovskites and its characterization based on structural, morphological, thermal, and mechanical properties. The main objectives include:
• Synthesis of nanostructure perovskite powders and its characterisation by TG/DTA, BET, XRD, SEM and HRTEM techniques.
• Physical characterizations of prepared perovskite nanostructures by sintering, densification and characterization.
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