Presentation Title

The Effect of Synthesis Conditions on the formation and Crystal Structure of Perovskite Oxygen Transport Membranes

Faculty Mentor

Dr. Allyson Fry-Petit

Start Date

18-11-2017 11:30 AM

End Date

18-11-2017 11:45 AM

Location

9-279

Session

Physical Sciences 1

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

Oxygen transport membranes (OTM) are a promising technology that improves current oxygen separation methods by lowering costs and increasing efficiency. OTMs are composed of metal oxides which transport both oxygen ions and electrons across a membrane. Perovskite materials have been proposed as OTMs. This project focuses on synthesizing three perovskites with varying composition using three different synthesis techniques. The compounds will be synthesized using a solid-state ceramic method and two different sol-gel method that involve the use of citrate/EDTA and citrate/ethylene glycol to understand the effect of synthesis technique on the underlying structure. The structure of all compounds has been investigated using powder X-ray diffractometry. It has been shown that all three compounds can be successfully synthesized via all three synthesis routes and the details of the crystal structure analysis is ongoing.

Summary of research results to be presented

The results show that La1-xSrxCo1-yFeyO3-δ (x=1, y=0.6,1) was successfully synthesized using all three methods. Additionally, BaCexFe1-xO3-δ (x=0.15, y=0.85) was synthesized using all methods and the main phase is forming but it is not fully pure yet. The most successful method for that sample was sol-gel using citrate and ethylene glycol. Also observed that solid-state synthesis increases the amount of heating due to increased diffusion path lengths while sol gel methods decrease the need for multiple high temperature heatings due to decreased diffusion path lengths.

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Nov 18th, 11:30 AM Nov 18th, 11:45 AM

The Effect of Synthesis Conditions on the formation and Crystal Structure of Perovskite Oxygen Transport Membranes

9-279

Oxygen transport membranes (OTM) are a promising technology that improves current oxygen separation methods by lowering costs and increasing efficiency. OTMs are composed of metal oxides which transport both oxygen ions and electrons across a membrane. Perovskite materials have been proposed as OTMs. This project focuses on synthesizing three perovskites with varying composition using three different synthesis techniques. The compounds will be synthesized using a solid-state ceramic method and two different sol-gel method that involve the use of citrate/EDTA and citrate/ethylene glycol to understand the effect of synthesis technique on the underlying structure. The structure of all compounds has been investigated using powder X-ray diffractometry. It has been shown that all three compounds can be successfully synthesized via all three synthesis routes and the details of the crystal structure analysis is ongoing.