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Fabrication and mechanical characterization of BaFe0.9M0.1O3-d (M Nb, Ta, W and Ti) MIEC perovskites.

 

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– Descripción del Proyecto (Introduction and literaturereview);

– Hipótesis y Objetivos (Hypothesis and objectives);

– Métodos y Plan de Trabajo (methodology and work plan);

– Trabajo adelantado (works done);

– Referencias (References);

– Alcance del Proyecto (Project scope or limitations)

Title: Fabrication and mechanical characterization of BaFe0.9M0.1O3-d (M: Nb, Ta, W and Ti) MIEC perovskites

Abstract:

Mixed ionic and electronic conductors (MIECs) specially perovskite-structured materials which conduct both ions (for example oxygen ions) and electronic charge carriers (electrons and/or holes) have received substantial interest in recent decades for various applications such as oxygen separation membrane and solid oxide fuel cells for electricity production.  These breakthrough technologies require ceramic membranes with high mechanical reliability during fabrication and under operation conditions, which is one of key points for the scale up to the industrial application.

Over the last two decades, the development of materials with the perovskite structure (ABO3) has studied due to their ability to tolerate extensive modifications in their compositions.  It has been demonstrated that the appropriate selection of the A- and B-site elements (or element combinations) can change their electrical and electrochemical characteristics and thus render them more useful as SOFC components materials and gas separation membranes. Barium ferrite oxide (BaFeO3-δ) has been regarded as a potential iron-rich electrode membrane in SOFCs due to its high electrocatalytic activity and fast surface exchange kinetics. It also possesses good chemical and thermal stability under severe conditions and has been widely synthesized and applied in many applications. However, there is a mismatch of ionic radius between Ba and Fe, the BaFeO3-d usually exists as a multiphase compound. To stabilize the cubic lattice structure, many investigations have been focused on B-site doping with ferroactive highly charged Nb, Ta, Mo, and W cations and active research continues to optimize doping strategies. Despite many studies have concentrated on conduction properties and performance of newly developed materials, their associated mechanical properties studies are limited in the literature.

Therefore, in this proposal, synthesis and fabrication of BaFe0.9M0.1O3-d (M Nb, Ta, W and Ti) by chemical route methods followed by calcination and densification studies are proposed.  X-ray diffraction technique will be used for structural characterizations and Rietveld refinement analyses. After fabrication, their mechanical properties characterizations will be carried out.

 

General Objectives

Fabrication and mechanical characterization of BaFe0.9M0.1O3-d (M: Nb, Ta, W and Ti) MIEC perovskites.

 

Specific Objectives

  1. Synthesis of nanostructure perovskite powders and their powder characteristics

1.1 Synthesis of BaFe0.9M0.1O3-d (M: Nb, Ta, W and Ti) nanostructure perovskites powders

1.2. Calcination studies and characterization of the prepared perovskite nano powders byTG/DTA, BET, XRD, SEM and HRTEM techniques.

 

 

  1. Physical characterizations of prepared perovskite nanostructures:

2.1. Sintering and densification studies to obtain dense electrolyte and porous electrode with different relative densities.

2.2. Characterization of coefficient of thermal expansion (CTE) of prepared perovskite nanostructures.

 

  1. Mechanical characterizations of prepared perovskite nanostructures:

3.1. Studies on the elastic modulus of prepared perovskite nanostructures.

2.2. Studies on the microhardness and fracture toughness of prepared perovskite nanostructures.

2.3. Studies on the flexural strength of prepared perovskite nanostructures.

2.4. Creep behaviour studies of prepared perovskite nanostructures.

 

9 pages / 2475 words

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