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Barrier Layer Effect in Core Shell Nd/Zr Doped BaTiO3

Barrier Layer Effect in Core Shell Nd/Zr Doped BaTiO3 Relva C. Buchanan, University of Cincinnati Main Campus, DMR 0805127. BL. BL. Surface. Interior. Surface. (1). EDAX analysis confirm the gradient distribution of O 2- and Ba 2+ as shown in the image (1) as well as in the tables

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Barrier Layer Effect in Core Shell Nd/Zr Doped BaTiO3

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  1. Barrier Layer Effect in Core Shell Nd/Zr Doped BaTiO3 Relva C. Buchanan, University of Cincinnati Main Campus, DMR 0805127 BL BL Surface Interior Surface (1) • EDAX analysis confirm the gradient distribution of O2- and Ba2+ as shown in the image (1) as well as in the tables • Fig (2) shows the BL phenomenon and the changes in lattice parameter across the Nd/Zr doped BaTiO3 structure. Asymmetry of the plot indicate the sensitivity to the oxygen partial pressure ( Less oxygen diffusion from the back side of the sample during sintering ) • In this structure, ZrO2accumulate in the grain boundary , while Nd3+ follows a double substitution mechanism according to the oxygen partial pressure (2) A A B B Fig. (1) EDAX / (2) XRD analysis for Nd/ Zr doped BT A- Oxidized surface region, B – Reduced interior region

  2. Broader Impacts Barrier Layer Mechanisms in Nd/Zr doped in BaTiO3 Ceramics Coupled properties of strain, polarization and conduction and field switching are significantly enhanced in these core-shell/barrier layer gradient structures. The tunable site occupancy property of Nd3+ in the co-doped system enables development of SBL and GBBL structures to achieve exceptionally high permittivity, good stability and relatively low loss. Relva C. Buchanan, University of Cincinnati Main Campus, DMR 0805127 This characteristics was modeled using a brick layer structure to link the component parts of surface barrier layer (SBL) effect and grain boundary barrier layer (GBBL) effects as follows SBL effect: es′ = eb′ (D / 2d); GBL effect: e′s = e′b(dc/dcb) Showing that the GBL effect is independent of the pellet thickness D and GBL dominates if dc/dcb > D/2d The brick layer model is illustrated in this figure. These new findings open up possibilities of supercapacitors, high energy storage applications as well as superior barrier layer capacitors for device use. The students are exposed to all aspects of this research which motivates them to further research and professional development Fig. 3 Brick layer model for Barrier Layer structure in doped BT

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