Development and chemical stability evaluation of enhanced surface LaFe1-xTixO3 (LFT) perovskites using polystyrene nanospheres as templating agent

作者：Lancucki Lukasz; Mizera Adrian; Lacz Agnieszka; Drozdz Ewa; Bucko Miroslaw M; Pasierb Pawel^*

来源：Journal of Alloys and Compounds, 2017, 727: 863-870.

DOI：10.1016/j.jallcom.2017.08.205

• Lanthanum iron oxide
• Titanium substitution
• Stabilization
• Three dimensionally ordered macroporous materials

A set of three dimensionally ordered (3-DOM) structure materials based on LaFe1-xTixO3 with different amount of titanium (from 0 to 20 mol %) were synthesized and investigated. It was found that titanium addition converts the LaFeO3 structure from orthorhombic into cubic phase and those results stay in correlation with Goldschmidt tolerance factor calculations. To evaluate the chemical stability of synthesized materials the corrosion tests (720 h at ambient temperature in pure CO2 and H2O 100% RH) were performed. Both FTIR and TGA-QMS techniques were used to characterize the samples prior and after the CO2/H2O exposition. It was found that during the test lanthanum carbonate is formed. Furthermore the intensity of carbonates vibrations correlate with the increase of titanium addition, which stays in agreement to TGA-QMS results. Additionally, average metal oxygen bond energy (ABE) calculations also substantiate that titanium addition leads to higher phase stability.

• 出版日期2017-12-15