50. synthesis of cubic microstructures of perovskite materials

Department: Mechanical & Aerospace Engineering
Research Institute Affiliation: CaliBaja Center for Resilient Materials & Systems
Faculty Advisor(s): Olivia A. Graeve

Primary Student
Name: Maritza Sanchez
Email: mas003@ucsd.edu
Phone: 909-827-2881
Grad Year: 2021

By manipulating various parameters, such as particle shape and composition, we seek to better understand the relationship between the microstructure (atoms, crystal structure) and the macro-scale behavior (strength) of ceramics, in order to create more robust materials. We synthesized barium titanate (BaTiO3) into cubic nanoparticles using a composite-hydroxide-mediated method (CHM). Fifteen samples were produced and analyzed to observe the effects of time on the particle structure and size. All samples were synthesized at 220C in ambient atmosphere with particle growth times of either 24, 36, 48, 60, or 72 hours. The sample compositions and crystal structures were analyzed using X-ray diffraction (XRD), and all XRD curves showed the successful and complete formation of BaTiO3. Scanning electron microscopy (SEM) was used to analyze the shape and size of the particles produced. A time of 24 hours of growth time was shown to be most favorable with high occurrences of cubic particles and a consistent size of 125 nm, while other times resulted in less monodispersity and varied shapes. These samples exhibited a variation of cubes and long rod-like structures. With the results obtained we are developing a similar synthesis process for MgAl2O4, with the goal of producing the spinel structure with cubic particle morphology. Magnesium aluminum oxide, MgAl2O4 is a model material with stable redox chemistry, well-characterized spinel structure, and many desirable properties. This makes this material ideal to gain fundamental mesoscale knowledge on spinel structures [1-2]. Developing ordered arrangements of cubic particles will allow us to assess the role of specific grain boundary distributions and arrangements on nanomechanics and macro-mechanical behavior. This project will open up new areas of interest on fundamental knowledge of material structures, specifically oxide spinels to solve current societal needs like the need for more potent batteries, clean energy sources, and stronger civil structures [3]. References [1] I. Ganesh, ChemInform, vol. 44, no. 27, p. no-no, 2013.
 [2] I. Reimanis and H. Kleebe, Journal of the American Ceramic Society, vol. 92, no. 7, pp. 1472-1480, 2009.
 [3] From Quanta to the Contiuum: Opportunities for Mesoscale Science; U.S, Department of Energy, Nuclear Energy, 2012.

Industry Application Area(s)
Civil/Structural Engineering | Energy/Clean technology | Materials

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