msepostdoc-list Seminar Notice for Matthew Michie's Ph.D. Final Exam. Seminar Wednesday, July 17, at 9:00 a.m., in ARMS 3109; Exam same day at 10:00, in ARMS B197 "Grain Growth Rate Transitions in Barium Strontium Titanate"

[Son, Rosemary E]

Please consider attending the following:

MATERIALS ENGINEERING
SEMINAR



"Grain Growth Rate Transitions in Barium Strontium Titanate"

By
Matthew J. Michie
Purdue MSE Ph.D. Final Exam

Advisors: Professor Carol A. Handwerker and Professor John E. Blendell

ABSTRACT

Understanding grain growth of dielectric ceramics is essential to controlling the electrical and mechanical properties necessary to produce ceramic capacitors and sensors. The effect of alloying barium titanate with strontium titanate on the equilibrium crystal shape is being investigated in order to determine possible impacts on grain growth. The equilibrium crystal shape is being studied through three experimental methods to identify possible changes in the mobility or driving force with changing composition. The first method is by imaging intergranular pores to observe faceting behavior and relative interfacial energies. The second method is to perform atomic force microscopy on surface facets to collect topography data. The topography data is combined with orientation data obtained by EBSD analysis from the same region and is used to calculate the normal vector of the surface facets. The normal vectors are plotted in a stereographic projection to verify the faceting relationships observed in the pore shape analysis. The third method involves collecting EBSD orientation data and images of surface faceting behavior. The surface faceting behavior of each grain is categorized by type of facet and plotted on a stereographic projection at the corresponding orientation. This allows for the analysis of faceting transitions and the differentiation of faceted and continuous regions of the equilibrium crystal shape. The analysis of the equilibrium crystal shape of across compositions has implications on grain growth of the barium titanate/strontium titanate system.









Date: Wednesday, July 17, 2019

Time: 9:00 A.M.
Place: ARMS 3109

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