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Defect Mechanisms in Bismuth-based Perovskites

Creator:: Kumar, Nitish
Abstract:: The aim of this research is to develop a fundamental understanding of the dominant defect species and the relevant defect equilibrium conditions for bismuth-containing perovskites to help guide the development of these materials for emerging applications. This is of paramount importance for many demanding applications, because ultimately the defect equilibria...
Resource Type:: Dissertation
Full Text:: DISSERTATION OF Nitish Kumar for the degree of Doctor of Philosophy in Materials Science presented on

Electromechanical strain and bipolar fatigue in Bi(Mg1/2Ti1/2)O3-(Bi1/2K1/2)TiO3-(Bi1/2Na1/2)TiO3 ceramics

Creator:: Kumar, Nitish and Cann, David P.
Abstract:: Lead-free ceramics of composition Bi(Mg₁/₂Ti₁/₂)O₃-(Bi₁/₂K₁/₂)TiO₃-(Bi₁/₂Na₁/₂)TiO₃ were prepared using solid state synthesis techniques. The dielectric spectra showed a Tmax of more than 320 °C for all compositions, and the transitions became increasingly diffuse as the Bi(Mg₁/₂Ti₁/₂)O₃ content increased. A lower temperature transition, indicating a transformation from an ergodic to a non-ergodic...
Resource Type:: Article
Full Text:: -(Bi1/2K1/2)TiO3-(Bi1/2Na1/2)TiO3 ceramics Nitish Kumara) and David P. Cann Materials Science, School

Role of point defects in bipolar fatigue behavior of Bi(Mg[subscript 1/2]Ti[subscript 1/2])O₃ modified (Bi[subscript 1/2]K[subscript 1/2])TiO₃-(Bi[subscript 1/2]Na[subscript 1/2])TiO₃ relaxor ceramics

Creator:: Kumar, Nitish, Ansell, Troy Y., and Cann, David P.
Abstract:: Lead-free Bi(Mg₁/₂Ti₁/₂)O₃-(Bi₁/₂K₁/₂)TiO₃-(Bi₁/₂Na₁/₂)TiO₃ (BMT-BKT-BNT) ceramics have been shown to exhibit large electromechanical strains under high electric fields along with negligible fatigue under strong electric fields. To investigate the role of point defects on the fatigue characteristics, the composition 5BMT-40BKT-55BNT was doped to incorporate acceptor and donor defects on the A and...
Resource Type:: Article
Full Text:: )TiO3 relaxor ceramics Nitish Kumar,a) Troy Y. Ansell, and David P. Cann Materials Science, School of

Multilayer ceramic capacitors based on relaxor BaTiO₃-Bi(Zn₁/₂Ti₁/₂)O₃ for temperature stable and high energy density capacitor applications

Creator:: Kumar, Nitish, Ionin, Aleksey, Ansell, Troy, Kwon, Seongtae, Hackenberger, Wesley, and Cann, David
Abstract:: The need for miniaturization without compromising cost and performance continues to motivate research in advanced capacitor devices. In this report, multilayer ceramic capacitors based on relaxor BaTiO₃-Bi(Zn₁/₂Ti₁/₂)O₃ (BT-BZT) were fabricated and characterized. In bulk ceramic embodiments, BT-BZT has been shown to exhibit relative permittivities greater than 1000, high resistivities (ρ > 1...
Resource Type:: Article
Full Text:: temperature stable and high energy density capacitor applications Nitish Kumar,1,a) Aleksey Ionin,1 Troy

Design techniques for VCO based digital sensor readout circuits

Creator:: Prabha, Praveen
Abstract:: Sensors find a variety of applications in portable electronics, automotive and biomedical solutions. The demand for low power and high dynamic range makes the design of digital sensor readout circuits quite challenging. Traditionally, these circuits are realized using amplifiers with passive feedback or precision analog comparators which are power hungry...
Resource Type:: Masters Thesis
Full Text:: Digital Sensor Readout Circuits Abstract approved: Pavan Kumar Hanumolu Sensors find a variety of

Relaxor characteristic and phase evolution of complex perovskite barium titanate bismuth zinc titanate ceramics

Creator:: Triamnak, Narit
Abstract:: Relaxor characteristic of the solid solution (1-x)BaTiO₃-(x)Bi(Zn₁/₂Ti₁/₂)O₃ (BTBZT) was investigated in this research. X-ray diffraction technique and Raman spectroscopy revealed the crystal structure of BT-BZT at various compositions. For compositions with x ≤ 0.08, the solid solutions exhibited clear tetragonal symmetry and transitioned to pseudo-cubic symmetry as the content of...
Resource Type:: Dissertation
Full Text:: . Patterson, Natthaphon Raengthon, Troy Ansell, Noon Prasertpalichat, Nitish Kumar, also, including Ashley

Dielectric Properties of Perovskite Ceramics Based on BaTiO3 and Bi(Mg1/2Ti1/2)O3

Creator:: Sundahl, Christopher S.
Abstract:: The properties of (1-x)BaTiO3-xBi(Mg1/2Ti1/2)O3 (BT-BMT) ceramics were fabricated from reagent-grade ceramic powders by solid-state methods and investigated for solubility, relative permittivity, dielectric loss, polarization, and electromechanical strain. The solubility limit was found to be between x = 0.3 and 0.4. Ba-deficient samples were fabricated, corresponding to stable single-phase compositions; these...
Resource Type:: Honors College Thesis
Full Text:: , Nitish, Sunny, Noon, Eric, and Jason, all of whom responded promptly to my feeble cries for help when I

Thin Films via Chemical Solution Deposition Synthesis from the (Bi₀.₅Na₀.₅)TiO₃-(Bi₀.₅K₀.₅)TiO₃-Bi(Mg₀.₅Ti₀.₅)O₃ Ternary System

Creator:: Mendez, Jose Eduardo
Abstract:: The ternary system (Bi₀.₅Na₀.₅)TiO₃-(Bi₀.₅K₀.₅)TiO₃-Bi(Mg₀.₅Ti₀.₅)O₃ (BNT-BKT-BMgT) was explored along the [75-(x 2) ]Bi₀.₅Na₀.₅TiO₃ - [25-(x 2)]Bi₀.₅K₀.₅TiO₃ - [x]Bi(Mg₀.₅Ti₀.₅)O₃ composition line. Thin films were fabricated using chelated mixing route solutions spin cast onto platinized silicon substrates. Processing parameters such as: excess cation molar%, solution molality, and crystallization temperatures, for composition where x=0,...
Resource Type:: Masters Thesis

Development of new high-temperature piezoelectric perovskite ceramics

Creator:: Ansell, Troy Youngmin
Abstract:: Lead zirconate titanate (PZT) is the dominant ferroelectric material in the market due to its excellent piezoelectric properties, relatively high Curie transition temperature (T[subscript C]), low cost, etc. However, because of emerging applications with requirements for high temperature (T[subscript C] > 400 °C) ferroelectrics, researchers are increasingly looking at alternative...
Resource Type:: Dissertation
Full Text:: project and thesis. I would like to thank Ashley Mason, Nitish Kumar, Sasiporn (Noon) Prasertpalichat

Electronic Conduction and Ionic Diffusion in (Bi₀.₅Na₀.₅)TiO₃-(Bi₀.₅K₀.₅)TiO₃-based Thin Films, Electronic Conduction and Ionic Diffusion in (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3-based Thin Films

Creator:: Walenza-Slabe, Joel
Abstract:: Solid solutions based on the perovskite ferroelectrics Bi₀.₅Na₀.₅TiO₃ (BNT) and Bi₀.₅K₀.₅TiO₃ (BKT) might someday replace current Pb-based ferroelectric and piezoelectric devices. This is one goal of the Restrictions on Hazardous Substances (RoHS) guidelines seeking to limit Pb in consumer devices. Although the Bi-based ferroelectrics are well suited to the task...
Resource Type:: Dissertation
Full Text:: , especially Nitish and Troy for their help with my projects. And to all the others, there are far too many

ScholarsArchive@OSU

Defect Mechanisms in Bismuth-based Perovskites

Electromechanical strain and bipolar fatigue in Bi(Mg1/2Ti1/2)O3-(Bi1/2K1/2)TiO3-(Bi1/2Na1/2)TiO3 ceramics

Role of point defects in bipolar fatigue behavior of Bi(Mg[subscript 1/2]Ti[subscript 1/2])O₃ modified (Bi[subscript 1/2]K[subscript 1/2])TiO₃-(Bi[subscript 1/2]Na[subscript 1/2])TiO₃ relaxor ceramics

Multilayer ceramic capacitors based on relaxor BaTiO₃-Bi(Zn₁/₂Ti₁/₂)O₃ for temperature stable and high energy density capacitor applications

Design techniques for VCO based digital sensor readout circuits

Relaxor characteristic and phase evolution of complex perovskite barium titanate bismuth zinc titanate ceramics

Dielectric Properties of Perovskite Ceramics Based on BaTiO3 and Bi(Mg1/2Ti1/2)O3

Thin Films via Chemical Solution Deposition Synthesis from the (Bi₀.₅Na₀.₅)TiO₃-(Bi₀.₅K₀.₅)TiO₃-Bi(Mg₀.₅Ti₀.₅)O₃ Ternary System

Development of new high-temperature piezoelectric perovskite ceramics

Electronic Conduction and Ionic Diffusion in (Bi₀.₅Na₀.₅)TiO₃-(Bi₀.₅K₀.₅)TiO₃-based Thin Films, Electronic Conduction and Ionic Diffusion in (Bi0.5Na0.5)TiO3-(Bi0.5K0.5)TiO3-based Thin Films

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